At present, with the development and progress of science and technology, social productivity is constantly improving, and the role of frequency conversion technology in coal mine mechanical and electrical equipment co...At present, with the development and progress of science and technology, social productivity is constantly improving, and the role of frequency conversion technology in coal mine mechanical and electrical equipment control is becoming more and more obvious. Frequency conversion technology has the advantages of regulation and control, etc. The application of this technology in mines can promote the production efficiency of transportation and ventilation. Frequency conversion technology is widely used in modern life. Applying frequency conversion technology to mining equipment in modern coal mine mechanical and electrical engineering can ensure the smooth operation of mechanical and electrical equipment to a great extent. Therefore, this paper will focus on the application of frequency conversion technology in modern coal mine electromechanical engineering.展开更多
Power supply transformation technology is a required course for new energy major, which is a comprehensive course. Under the traditional teaching mode, students have no concept of waveform, which brings many difficult...Power supply transformation technology is a required course for new energy major, which is a comprehensive course. Under the traditional teaching mode, students have no concept of waveform, which brings many difficulties to teaching and experiment. A power transformation technology based on PSIM simulation is proposed. Before class, students solve the task of building the simulation model, and then introduce the knowledge points. This can not only make up for the lack of experimental facilities and also stimulate students interest in learning. Classroom teaching practice shows that this method can effectively improve the teaching and experiment efficiency.展开更多
In the past years, bistatic Radar Cross Section (RCS) characteristic has been caught increasing attention. The paper presents a bistatic RCS measurement system of full-size goals, which uses photoelectric conversion t...In the past years, bistatic Radar Cross Section (RCS) characteristic has been caught increasing attention. The paper presents a bistatic RCS measurement system of full-size goals, which uses photoelectric conversion technology to solve the problem that excessive electrical signal attenuation exits because of the large distance between sending and receiving antenna. The paper analyzes the basic principle of photoelectric conversion and RCS measurement system, applies photoelectric conversion technology to RCS measurement system, and tests whether RCS measurement system works well while using photoelectric conversion technology. The test results show that the system can efficiently obtain the bistatic RCS characteristic of full-size targets.展开更多
Fracturing equipment is the core device in shale gas reservoir stimulation.As domestic shale gas exploration and development steps into deep layers,the development of fracturing technology puts forward higher requirem...Fracturing equipment is the core device in shale gas reservoir stimulation.As domestic shale gas exploration and development steps into deep layers,the development of fracturing technology puts forward higher requirements for relevant equipment.Electric drive is an important devel-opment direction of fracturing equipment technology.In this paper,the technical progress of electric drive fracturing equipment in China and abroad was investigated.It is shown that a high-power frequency conversion system is the key technology to determine the performance of electric drive fracturing equipment.After the adaptability of the high-power frequency conversion technology to electric drive fracturing equipment was analyzed,based on the fracturing operation of Model 2500 electric drive fracturing trucks in the Weiyuan Block of the Sichuan Basin for shale gas reservoir stimulation,electric drive and diesel-driven fracturing equipment were comparatively analyzed from the aspects of economic and technical in-dicators.And the following research results were obtained.First,compared with a diesel-driven fracturing truck of the same power,an electric drive fracturing truck can realize a full power coverage and a continuous adjustment of output displacement,and can better meet the operation re-quirements of fracturing process for a precise control of the pumping displacement,while reducing the power cost by 68%and the equipment purchase cost by 10e20%.Second,compared with the skid mounted equipment,an electric drive fracturing truck has a better transport performance,being suitable for the fracturing well sites with poor road conditions,such as loess gullies,hills and mountains.It is suggested that the following development direction of the electric drive fracturing equipment should focus on the improvement of single machine power density.In addition,it is recommended to enhance the basic studies on high-pressure and high-power semiconductor devices and make a good plan for the power demand of shale gas platform construction in advance,so as to give a better play to the operating cost advantage of electric drive fracturing equipment.展开更多
Dear Editor,Allele conversion technology has broad application value in plant breeding.Here,we report a user-friendly allele conversion technology based on clustered regularly interspaced short palindromic repeats(CRI...Dear Editor,Allele conversion technology has broad application value in plant breeding.Here,we report a user-friendly allele conversion technology based on clustered regularly interspaced short palindromic repeats(CRISPR)-Cas9 and hyperrecombination lines(HRLs)(Figure 1A).Many agronomically important traits are controlled by single nucleotide polymorphisms(SNPs),insertions or deletions,and other types of small variations between alleles.Traditionally,breeders have relied on backcrossing and selection to introduce a useful allele into the genome of another variety.展开更多
Biomass supplies about 80% of the energy needs for cooking and heating in rura<span>l Ghana. It is predominantly used in traditional and inefficient for</span>ms (firewood and<span> charcoal), which ...Biomass supplies about 80% of the energy needs for cooking and heating in rura<span>l Ghana. It is predominantly used in traditional and inefficient for</span>ms (firewood and<span> charcoal), which presents environmental and health concerns. In order to better the living standard in rural Ghana, efforts must be made to provide modern energy services. Most rural communities in Ghana are so remote that an extension of the national grid is uneconomical, hence biomass electricity provides a viable alternative. Biomass is pivotal to the socio-economic</span> development of rural Ghana due to its easy accessibility and enormous potential in the production of varied energy forms. In this paper, a comprehensive review of biomass resources, biomass energy conversion technologies and bioenergy production potential for rural development in Ghana is provided. The most important feedstock from an energy perspective was found to be crop residues. Based on 2017 statistics, Ghana has a theoretical potential of 623.84 PJ of energy from agricultural crop residues and 64.27 PJ of energy from livestock production. Evidence from literature suggests that biomass gasification is the best conversion technology to expand electricity access rate for rural households in Ghana. The paper concludes that although ample biomass resources exist, cocoa pod husks (CPH) which is very common in rural Ghana can be pelletized and used as feedstock for rural power generation system</span><span style="font-family:"">s</span><span style="font-family:"">.展开更多
Proton exchange membrane fuel cells(PEMFCs) are regarded as a promising sustainable energy conversion technology due to their environmental friendliness and high efficiency [1,2]. However, the sluggish kinetics of fou...Proton exchange membrane fuel cells(PEMFCs) are regarded as a promising sustainable energy conversion technology due to their environmental friendliness and high efficiency [1,2]. However, the sluggish kinetics of four-electron oxygen reduction reaction(ORR) result in the cathode catalysts requiring more than five times the amount of precious metal Pt compared to the anode, which limits the widespread application of PEMFCs.展开更多
The search for efficient,robust,and cost-effective catalysts for the hydrogen evolution reaction(HER)is highly desirable.However,the development of freshwater/seawater electrolysis for hydrogen production as a viable ...The search for efficient,robust,and cost-effective catalysts for the hydrogen evolution reaction(HER)is highly desirable.However,the development of freshwater/seawater electrolysis for hydrogen production as a viable energy conversion technology remains a challenge.Herein,a fluorine-doped Ni(OH)_(2)/Ni–B amorphous heterostructure(FNH/NB)was synthesized via simple hydrothermal,electroless plating,and alkaline etching methods.Our designed experiments demonstrate that the as-prepared catalyst benefiting from amorphous interfacial coupling and F-induced effects exhibits accelerated H_(2)O dissociation kinetics and optimized adsorption of intermediates.As a result,the FNH/NB catalyst shows high alkaline HER activity,requiring low overpotentials of 23,28,and 30 mV to drive a current density of 10 mA cm^(−2) in alkaline freshwater,simulated seawater,and real seawater,respectively.Particularly,the stability of the designed catalyst is effectively improved using a fluorine doping strategy.Specifically,FNH/NB could maintain excellent electrocatalytic performance over 50 hours at current densities of 10 and 1000 mA cm^(−2) in an alkaline solution containing KF.The current work reveals the superiority of integrating F doping and amorphous heterostructure engineering in developing efficient and robust catalysts.展开更多
The pursuit of two-dimensional single-atom catalysts(SACs)is of significant importance for advancing the energy conversion and storage technologies by providing efficient,stable,and low-cost alternatives for precious ...The pursuit of two-dimensional single-atom catalysts(SACs)is of significant importance for advancing the energy conversion and storage technologies by providing efficient,stable,and low-cost alternatives for precious metals in the hydrogen evolution reaction(HER),oxygen evolution reaction(OER),and oxygen reduction reaction(ORR).The synergy between tunable ligands,abundant transition metal active sites,and diverse substrate materials facilitate in attaining both stability and enhanced catalytic activity.This study provides a thorough examination of the catalytic HER/OER/ORR activities in 161 TM@C_(15)N_(6)XY_(2)H_(5)SACs,combining density functional theory with machine learning(ML).Thirteen configurations were identified,comprising 11 single-function OER/ORR catalysts,a bifunctional OER/ORR catalyst,namely Cu@C_(15)N_(6)O_(3)H_(5),and Au@C_(15)N_(6)OS_(2)H_(5),which demonstrated trifunctional HER/OER/ORR catalytic activity.A pronounced hybridization between Cu/Au-d orbitals and O-p orbitals of oxygenated adsorbates directs the lone electrons to antibonding states before transitioning to bonding orbitals,enabling efficient adsorption of oxygenated intermediates on the surface.The data obtained through ML applications indicate that the atomic radius(r_(TM))and electronegativity(χ)of TM are the primary descriptors for the HER activity,while the d-electron count(θ)and atomic radius(rTM)of the atoms are the key descriptors for the OER/ORR activities.Through the SISSO method,a clear and robust correlation between intrinsic properties and adsorption energy was derived,enabling predictions at each step.Additionally,the constant-potential model showed that electric double-layer capacitance modulated the reaction barrier;meanwhile,pH^(-) and voltage-dependent adsorption free energies indicated that acidic and alkaline conditions(pH 5.3/9.9,Cu@C_(15)N_(6)O_(3)H_(5)/Au@C_(15)N_(6)OS_(2)H_(5))enhanced the OER efficiency,while pH 0 is optimal for the ORR.展开更多
As a core driving force for energy conversion and storage,electrochemical catalytic technology has an irreplaceable strategic position in realizing the goal of carbon neutrality.However,it is still limited by bottlene...As a core driving force for energy conversion and storage,electrochemical catalytic technology has an irreplaceable strategic position in realizing the goal of carbon neutrality.However,it is still limited by bottlenecks such as low catalytic activity,selectivity and stability.In this context,multimetallenes have become a new platform to overcome the above bottlenecks by virtue of their ultra-high specific surface area,tunable electronic properties,and synergistic effects of multiple components brought about by atomic-level thickness.However,the current research hotspots still focus on monometallene systems,and the development of multimetallenes is limited by the core problems such as compositional segregation due to the differences in the reduction kinetics of the multivariate precursors,the difficulty of controllable synthesis of high-entropy systems,and the unknown mechanism of the dynamic evolution of the active sites under the complex working conditions,which seriously restrict their practical application performance under high current density and harsh conditions.This review systematically compiles the latest progress in this field:first,focusing on the innovation of controllable synthesis strategies,detailing the methods of surface energy-regulated reduction growth,hard template-limited domain thermally driven co-reduction,and self-template-assisted step-by-step alloying,aiming at solving the problem of multimetallene homogeneity and realizing precise construction;second,in-depth discussion of the optimization of multi-dimensional structural modification,covering the defect engineering,lattice strain modulation,polyalloying,non-metallene doping,heterogeneous interface design,surface functionalization,etc.,to finely regulate the electronic and geometric structures of the materials and significantly enhance the reaction kinetics and durability;finally,in terms of application expansion,we focus on the breakthroughs of its performance in high-current density scenarios,such as oxygen reduction,all-water decomposition,small-molecule electro-oxidation/coupling,and CO_(2)reduction.The aim of this paper is to provide comprehensive guidance for the design of highly efficient and stable multimetallene-based electrode materials,to promote their large-scale application in high-performance membrane electrode devices and integrated energy systems,to accelerate the industrialization of electrochemical conversion technologies,and to help achieve the goal of carbon neutrality.展开更多
The conversion of CO_(2)into high-value fuels and chemicals has garnered research interest worldwide.The conversion and utilization of CO_(2)has become one of the most urgent tasks for society.In this context,using so...The conversion of CO_(2)into high-value fuels and chemicals has garnered research interest worldwide.The conversion and utilization of CO_(2)has become one of the most urgent tasks for society.In this context,using solar energy to convert CO_(2)into high-value fuels such as CH4 and CH_(3)OH has extremely high potential application value.Herein,the research progress and results of applying various photocatalysts in photocatalytic CO_(2)reduction with various novel catalysts were reviewed.Furthermore,strategies for improving photocatalytic performance were reviewed.Finally,improving the catalytic mechanism of catalysts and designing novel highactivity,high-stability catalysts through comprehensive exploration of the reaction mechanism were suggested to meet the future requirements of industrial production.展开更多
Carbon nanotube field effect transistor（CNFET） shows lower threshold voltage and smaller leakage current in comparison to its CMOS counterpart. In this paper, two kinds of CNFET-based rectifiers, full-wave rectifier...Carbon nanotube field effect transistor（CNFET） shows lower threshold voltage and smaller leakage current in comparison to its CMOS counterpart. In this paper, two kinds of CNFET-based rectifiers, full-wave rectifiers and voltage doubler rectifiers are presented for biomedical implantable applications. Based on the standard 32 nm CNFET model, the electrical performance of CNFET rectifiers is analyzed and compared. Simulation results show the voltage conversion efficiency（VCE） and power conversion efficiency（PCE） achieve 70.82% and 72.49% for CNFET full-wave rectifiers and 56.60% and 61.17% for CNFET voltage double rectifiers at typical 1.0 V input voltage excitation, which are higher than that of CMOS design. Moreover, considering the controllable property of CNFET threshold voltage, the effect of various design parameters on the electrical performance is investigated.It is observed that the VCE and PCE of CNFET rectifier increase with increasing CNT diameter and number of tubes. The proposed results would provide some guidelines for design and optimization of CNFET-based rectifier circuits.展开更多
文摘At present, with the development and progress of science and technology, social productivity is constantly improving, and the role of frequency conversion technology in coal mine mechanical and electrical equipment control is becoming more and more obvious. Frequency conversion technology has the advantages of regulation and control, etc. The application of this technology in mines can promote the production efficiency of transportation and ventilation. Frequency conversion technology is widely used in modern life. Applying frequency conversion technology to mining equipment in modern coal mine mechanical and electrical engineering can ensure the smooth operation of mechanical and electrical equipment to a great extent. Therefore, this paper will focus on the application of frequency conversion technology in modern coal mine electromechanical engineering.
文摘Power supply transformation technology is a required course for new energy major, which is a comprehensive course. Under the traditional teaching mode, students have no concept of waveform, which brings many difficulties to teaching and experiment. A power transformation technology based on PSIM simulation is proposed. Before class, students solve the task of building the simulation model, and then introduce the knowledge points. This can not only make up for the lack of experimental facilities and also stimulate students interest in learning. Classroom teaching practice shows that this method can effectively improve the teaching and experiment efficiency.
文摘In the past years, bistatic Radar Cross Section (RCS) characteristic has been caught increasing attention. The paper presents a bistatic RCS measurement system of full-size goals, which uses photoelectric conversion technology to solve the problem that excessive electrical signal attenuation exits because of the large distance between sending and receiving antenna. The paper analyzes the basic principle of photoelectric conversion and RCS measurement system, applies photoelectric conversion technology to RCS measurement system, and tests whether RCS measurement system works well while using photoelectric conversion technology. The test results show that the system can efficiently obtain the bistatic RCS characteristic of full-size targets.
基金Project supported by CNPC's Major Engineering Technology Field Test Project“Integration and field test of online monitoring system of Model 7000 electric fracturing skid and diesel-driven fracturing unit”(No.:2019F-30)Shaanxi Province Postdoctoral Science Foundation Project“Research on key technologies of intelligent control system of electric drive fracturing device”(No.:2018BSHQYXMZZ04).
文摘Fracturing equipment is the core device in shale gas reservoir stimulation.As domestic shale gas exploration and development steps into deep layers,the development of fracturing technology puts forward higher requirements for relevant equipment.Electric drive is an important devel-opment direction of fracturing equipment technology.In this paper,the technical progress of electric drive fracturing equipment in China and abroad was investigated.It is shown that a high-power frequency conversion system is the key technology to determine the performance of electric drive fracturing equipment.After the adaptability of the high-power frequency conversion technology to electric drive fracturing equipment was analyzed,based on the fracturing operation of Model 2500 electric drive fracturing trucks in the Weiyuan Block of the Sichuan Basin for shale gas reservoir stimulation,electric drive and diesel-driven fracturing equipment were comparatively analyzed from the aspects of economic and technical in-dicators.And the following research results were obtained.First,compared with a diesel-driven fracturing truck of the same power,an electric drive fracturing truck can realize a full power coverage and a continuous adjustment of output displacement,and can better meet the operation re-quirements of fracturing process for a precise control of the pumping displacement,while reducing the power cost by 68%and the equipment purchase cost by 10e20%.Second,compared with the skid mounted equipment,an electric drive fracturing truck has a better transport performance,being suitable for the fracturing well sites with poor road conditions,such as loess gullies,hills and mountains.It is suggested that the following development direction of the electric drive fracturing equipment should focus on the improvement of single machine power density.In addition,it is recommended to enhance the basic studies on high-pressure and high-power semiconductor devices and make a good plan for the power demand of shale gas platform construction in advance,so as to give a better play to the operating cost advantage of electric drive fracturing equipment.
基金supported by the National Natural Science Foundation of China(32272727)the Technology Innovation Program of the Chinese Academy of Agricultural Sciences(CAAS-ASTIP-IVFCAAS).
文摘Dear Editor,Allele conversion technology has broad application value in plant breeding.Here,we report a user-friendly allele conversion technology based on clustered regularly interspaced short palindromic repeats(CRISPR)-Cas9 and hyperrecombination lines(HRLs)(Figure 1A).Many agronomically important traits are controlled by single nucleotide polymorphisms(SNPs),insertions or deletions,and other types of small variations between alleles.Traditionally,breeders have relied on backcrossing and selection to introduce a useful allele into the genome of another variety.
文摘Biomass supplies about 80% of the energy needs for cooking and heating in rura<span>l Ghana. It is predominantly used in traditional and inefficient for</span>ms (firewood and<span> charcoal), which presents environmental and health concerns. In order to better the living standard in rural Ghana, efforts must be made to provide modern energy services. Most rural communities in Ghana are so remote that an extension of the national grid is uneconomical, hence biomass electricity provides a viable alternative. Biomass is pivotal to the socio-economic</span> development of rural Ghana due to its easy accessibility and enormous potential in the production of varied energy forms. In this paper, a comprehensive review of biomass resources, biomass energy conversion technologies and bioenergy production potential for rural development in Ghana is provided. The most important feedstock from an energy perspective was found to be crop residues. Based on 2017 statistics, Ghana has a theoretical potential of 623.84 PJ of energy from agricultural crop residues and 64.27 PJ of energy from livestock production. Evidence from literature suggests that biomass gasification is the best conversion technology to expand electricity access rate for rural households in Ghana. The paper concludes that although ample biomass resources exist, cocoa pod husks (CPH) which is very common in rural Ghana can be pelletized and used as feedstock for rural power generation system</span><span style="font-family:"">s</span><span style="font-family:"">.
文摘Proton exchange membrane fuel cells(PEMFCs) are regarded as a promising sustainable energy conversion technology due to their environmental friendliness and high efficiency [1,2]. However, the sluggish kinetics of four-electron oxygen reduction reaction(ORR) result in the cathode catalysts requiring more than five times the amount of precious metal Pt compared to the anode, which limits the widespread application of PEMFCs.
基金The authors are grateful to Guangxi Science and Technology Program[No.Guike AD23026107]Natural Science Foundation of Guangxi Province of China[No.2024GXNSFBA010234]the National Natural Science Foundation of China[No.22062002,22265002]for financial support.
文摘The search for efficient,robust,and cost-effective catalysts for the hydrogen evolution reaction(HER)is highly desirable.However,the development of freshwater/seawater electrolysis for hydrogen production as a viable energy conversion technology remains a challenge.Herein,a fluorine-doped Ni(OH)_(2)/Ni–B amorphous heterostructure(FNH/NB)was synthesized via simple hydrothermal,electroless plating,and alkaline etching methods.Our designed experiments demonstrate that the as-prepared catalyst benefiting from amorphous interfacial coupling and F-induced effects exhibits accelerated H_(2)O dissociation kinetics and optimized adsorption of intermediates.As a result,the FNH/NB catalyst shows high alkaline HER activity,requiring low overpotentials of 23,28,and 30 mV to drive a current density of 10 mA cm^(−2) in alkaline freshwater,simulated seawater,and real seawater,respectively.Particularly,the stability of the designed catalyst is effectively improved using a fluorine doping strategy.Specifically,FNH/NB could maintain excellent electrocatalytic performance over 50 hours at current densities of 10 and 1000 mA cm^(−2) in an alkaline solution containing KF.The current work reveals the superiority of integrating F doping and amorphous heterostructure engineering in developing efficient and robust catalysts.
基金the funding support from the Natural Science Foundation of Shanghai(23ZR1443900)the National Natural Science Foundation of China(Grant No.22109098).
文摘The pursuit of two-dimensional single-atom catalysts(SACs)is of significant importance for advancing the energy conversion and storage technologies by providing efficient,stable,and low-cost alternatives for precious metals in the hydrogen evolution reaction(HER),oxygen evolution reaction(OER),and oxygen reduction reaction(ORR).The synergy between tunable ligands,abundant transition metal active sites,and diverse substrate materials facilitate in attaining both stability and enhanced catalytic activity.This study provides a thorough examination of the catalytic HER/OER/ORR activities in 161 TM@C_(15)N_(6)XY_(2)H_(5)SACs,combining density functional theory with machine learning(ML).Thirteen configurations were identified,comprising 11 single-function OER/ORR catalysts,a bifunctional OER/ORR catalyst,namely Cu@C_(15)N_(6)O_(3)H_(5),and Au@C_(15)N_(6)OS_(2)H_(5),which demonstrated trifunctional HER/OER/ORR catalytic activity.A pronounced hybridization between Cu/Au-d orbitals and O-p orbitals of oxygenated adsorbates directs the lone electrons to antibonding states before transitioning to bonding orbitals,enabling efficient adsorption of oxygenated intermediates on the surface.The data obtained through ML applications indicate that the atomic radius(r_(TM))and electronegativity(χ)of TM are the primary descriptors for the HER activity,while the d-electron count(θ)and atomic radius(rTM)of the atoms are the key descriptors for the OER/ORR activities.Through the SISSO method,a clear and robust correlation between intrinsic properties and adsorption energy was derived,enabling predictions at each step.Additionally,the constant-potential model showed that electric double-layer capacitance modulated the reaction barrier;meanwhile,pH^(-) and voltage-dependent adsorption free energies indicated that acidic and alkaline conditions(pH 5.3/9.9,Cu@C_(15)N_(6)O_(3)H_(5)/Au@C_(15)N_(6)OS_(2)H_(5))enhanced the OER efficiency,while pH 0 is optimal for the ORR.
基金supported by the National Natural Science Foundation of China(52272222)Taishan Scholar Young Talent Program(tsqn201909114 and tsqn201909123)University Youth Innovation Team of Shandong Province(202201010318).
文摘As a core driving force for energy conversion and storage,electrochemical catalytic technology has an irreplaceable strategic position in realizing the goal of carbon neutrality.However,it is still limited by bottlenecks such as low catalytic activity,selectivity and stability.In this context,multimetallenes have become a new platform to overcome the above bottlenecks by virtue of their ultra-high specific surface area,tunable electronic properties,and synergistic effects of multiple components brought about by atomic-level thickness.However,the current research hotspots still focus on monometallene systems,and the development of multimetallenes is limited by the core problems such as compositional segregation due to the differences in the reduction kinetics of the multivariate precursors,the difficulty of controllable synthesis of high-entropy systems,and the unknown mechanism of the dynamic evolution of the active sites under the complex working conditions,which seriously restrict their practical application performance under high current density and harsh conditions.This review systematically compiles the latest progress in this field:first,focusing on the innovation of controllable synthesis strategies,detailing the methods of surface energy-regulated reduction growth,hard template-limited domain thermally driven co-reduction,and self-template-assisted step-by-step alloying,aiming at solving the problem of multimetallene homogeneity and realizing precise construction;second,in-depth discussion of the optimization of multi-dimensional structural modification,covering the defect engineering,lattice strain modulation,polyalloying,non-metallene doping,heterogeneous interface design,surface functionalization,etc.,to finely regulate the electronic and geometric structures of the materials and significantly enhance the reaction kinetics and durability;finally,in terms of application expansion,we focus on the breakthroughs of its performance in high-current density scenarios,such as oxygen reduction,all-water decomposition,small-molecule electro-oxidation/coupling,and CO_(2)reduction.The aim of this paper is to provide comprehensive guidance for the design of highly efficient and stable multimetallene-based electrode materials,to promote their large-scale application in high-performance membrane electrode devices and integrated energy systems,to accelerate the industrialization of electrochemical conversion technologies,and to help achieve the goal of carbon neutrality.
基金Financial support for carrying out this work was provided by the Doctoral Research Foundation of Weifang University(2022BS13).
文摘The conversion of CO_(2)into high-value fuels and chemicals has garnered research interest worldwide.The conversion and utilization of CO_(2)has become one of the most urgent tasks for society.In this context,using solar energy to convert CO_(2)into high-value fuels such as CH4 and CH_(3)OH has extremely high potential application value.Herein,the research progress and results of applying various photocatalysts in photocatalytic CO_(2)reduction with various novel catalysts were reviewed.Furthermore,strategies for improving photocatalytic performance were reviewed.Finally,improving the catalytic mechanism of catalysts and designing novel highactivity,high-stability catalysts through comprehensive exploration of the reaction mechanism were suggested to meet the future requirements of industrial production.
基金Project supported by the National Natural Science Foundation of China(Nos.61131001,61404077,61571248)the Science and Technology Fund of Zhejiang Province(No.2015C31090)+2 种基金the Natural Science Foundation of Ningbo(No.2014A610147)State Key Laboratory of ASIC&System(No.2015KF006)the K.C.Wong Magna Fund in Ningbo University
文摘Carbon nanotube field effect transistor（CNFET） shows lower threshold voltage and smaller leakage current in comparison to its CMOS counterpart. In this paper, two kinds of CNFET-based rectifiers, full-wave rectifiers and voltage doubler rectifiers are presented for biomedical implantable applications. Based on the standard 32 nm CNFET model, the electrical performance of CNFET rectifiers is analyzed and compared. Simulation results show the voltage conversion efficiency（VCE） and power conversion efficiency（PCE） achieve 70.82% and 72.49% for CNFET full-wave rectifiers and 56.60% and 61.17% for CNFET voltage double rectifiers at typical 1.0 V input voltage excitation, which are higher than that of CMOS design. Moreover, considering the controllable property of CNFET threshold voltage, the effect of various design parameters on the electrical performance is investigated.It is observed that the VCE and PCE of CNFET rectifier increase with increasing CNT diameter and number of tubes. The proposed results would provide some guidelines for design and optimization of CNFET-based rectifier circuits.
