We have constructed the robust and highfield-stability scanning tunneling microscopy(STM)system which is equipped with a 12 Tsuperconductor magnet and the He-3 cryostat,obtaining the high-quality data of graphite whic...We have constructed the robust and highfield-stability scanning tunneling microscopy(STM)system which is equipped with a 12 Tsuperconductor magnet and the He-3 cryostat,obtaining the high-quality data of graphite which can be clearly characterized up to the 12-T high magnetic field and bulk 2H-NbSe2 whose vortex structure and surface defects can be clearly visualized by the scanning and dI/dV mapping.The pivotal factor of our superior data stems from the sapphire frame and its unique structure,which ensure an exceptional performance for the noise,which has the current spectral density low to 2×10^(-13)A√Hz at the low frequency with the cut-off frequency of 250 Hz and the engaging status,of vibration,promising to the robust platform for the investigation of the surface of materials.The low drifting rate from the image of graphite is v_(x)=-8:79×10^(-7)nm/s and v_(y)=-3.26×10^(-6)nm/s at 12 T and 0.3 K.Besides,equipped with the high-capacity He-3 cryostat(with 15 normal temperature and pressure liter He-3 gas),the system,which has the base temperature for 0.28 K,can operate at the low temperature for more than 72 h,ensuring the enduring research at the sub-Kelvin temperature for the dI/dV mapping and large-scale scanning.When the magnetic field is applied up to 12 T,the STM system also obtains the excellent-clarity and undistorted images of graphite,which proves the outstanding performance of the system at the high-field researches.展开更多
Layered V_(2)O_(5) cathode holds the merits of high theoretical specific capacity(589 mA h g^(-1))in aqueous zinc-ion batteries(AZIBs),yet it still suffers from inferior bulk conductivity and structure degradation not...Layered V_(2)O_(5) cathode holds the merits of high theoretical specific capacity(589 mA h g^(-1))in aqueous zinc-ion batteries(AZIBs),yet it still suffers from inferior bulk conductivity and structure degradation notably during prolonged cycling.Herein,we ingeniously design cations(Na^(+)/Co^(2+)/Al^(3+))and anion(F^(-))synergistic-doped hydrated V_(2)O_(5)·0.48H_(2)O cathode(VNACOF)to enhance the electronic and spatial effects in the bulk.A range of in-situ,ex-situ characterizations,and DFT calculations profoundly clarify the strengthened ionic/electronic conductivities,structural stability,and Zn^(2+)diffusion kinetics.As a result,the VNACOF displays a superior discharge capacity(529 mA h g^(-1)@0.1 C),rate capabilities(488 mA h g^(-1)@0.5 C,437 mA h g^(-1)@1C),and cycling stability(301 mA h g^(-1)@10 C@5000 cycles@93%)with sufficient energy density(393 W h kg^(-1)),Furthermore,the pouch-cells with high-load(60 mg)also deliver superior cyclic(2 C@178 mA h g^(-1)@1000 cycles@90%)and rate performance(132 mA h g^(-1)@5 C),revealing great application potential for high-energy-density and high-stability AZIBs.展开更多
We demonstrate a novel picosecond optical parametric preamplification to generate high-stability, high-energy and high-contrast seed pulses. The 5ps seed pulse is amplified from 60pJ to 300μJ with an 8.6ps/ 3mJ pump ...We demonstrate a novel picosecond optical parametric preamplification to generate high-stability, high-energy and high-contrast seed pulses. The 5ps seed pulse is amplified from 60pJ to 300μJ with an 8.6ps/ 3mJ pump laser in a signal stage of short pulse non-collinear optical parametric chirped pulse amplification. The total gain is more than 106 and the rms energy stability is under 1.35%. The contrast ratio is higher than 10s within a scale of 20ps before the main pulse. Consequently, the improvement factor of the signal contrast is approximately equal to the gain 106 outside the pump window.展开更多
Lithium metal batteries(LMBs)have attracted huge attention due to super-high capacity and low reduction potential of lithium anode constructing high-energy/power density.However,the practical application of LMBs is si...Lithium metal batteries(LMBs)have attracted huge attention due to super-high capacity and low reduction potential of lithium anode constructing high-energy/power density.However,the practical application of LMBs is significantly constrained by lithium dendrite growth and high reactivity of lithium anode.Herein,a novel functionalized interlayer that SbF3 is tandem on HKUST-1 skeleton forming favorable Sb-terminated groups structure(HKSF@PE),which were proposed and fabricated to construct highly stable LMBs.Theoretical calculations demonstrate that the Sb-terminated groups structure in this configuration display strong interaction with lithium,which can act as a cation receptor and adsorption sites,thereby promoting lithium-ion desolvation and improving lithium-ion transport kinetics.Meanwhile,in-situ XRD,Raman,and DRT analyses indicate that the HKSF assist the formation of LiF-rich and lithiophilic Li3Sb alloys at SEI/Li interface,regulating lithium depo-sition morphology and reconstructing a reinforced SEI interlayer.Consequently,Li|HKSF@PE|Li symmetric cell exhibits exceptional stability over 2500 h at 2 mA cm^(-2) with 1 mAh cm^(-2),and Li|HKSF@PE|LFP full cell demonstrates a high-capacity retention of 92.0%after 220 cycles even at a high rate of 5C.This work reveals the important role of terminated groups to achieve homogeneous lithium deposition and provide a way to construct stable LMBs.展开更多
In modern microprocessors, the multi-port register file is one of the key modules which provides fast and multiple data access for instructions. As the number of access ports in register files increases, stability bec...In modern microprocessors, the multi-port register file is one of the key modules which provides fast and multiple data access for instructions. As the number of access ports in register files increases, stability becomes a key issue due to the voltage fluctuation on bit lines. We propose to apply an isolated inverter to address the voltage fluctuation. To assess the register stability, we derive a closed-form expression of static noise margin （SNM） for our register file. The proposed SNM model can be used as a guideline to predict the impact of several register parameters on the stability and optimize register file designs. To validate the proposed SNM model, we fabricated a test chip of two-write-four-read （2W4R） 1024 bits register file in a TSMC 65 nm low-power CMOS technology. The experimental result shows that the stability of our register file cells with an isolated inverter improve the conventional cells by approximately 2.4 times. Also, the supply voltage causes a fluctuation of SNM of about 65%, while temperature and transistor mismatch cause a fluctuation of SNM of about 20%.展开更多
Due to the high theoretical capacity and electrode potential,Prussian blue is regarded as promising cathode material for potassium ion batteries.However,inferior structural stability,poor electronic conductivity,ambig...Due to the high theoretical capacity and electrode potential,Prussian blue is regarded as promising cathode material for potassium ion batteries.However,inferior structural stability,poor electronic conductivity,ambiguous energy storage mechanism have limited the application of Prussian blue materials.Herein,a highly stable Prussian blue-polypyrrole(PB-PPY)composite has been prepared by a facile one-step method.PB-PPY displays higher discharging capacity,better rate capacity,and longer cycling lifespan than that of pure Prussian blue in potassium ion batteries.The superior electrochemical performance can be attributed to the unique synthesis strategy to reduce the content of vacancies and crystal water in Prussian blue and enhance the conductivity.Furthermore,partial K ions have been evidenced that could remain in the Prussian blue framework,which contributes the long-term cycling stability.The K ions in the framework play the role of“pillars”to support the framework of Prussian blue and relieve the structural stress during the intercalation and de-intercalation of K ions.This work will reveal a new energy storage mechanism of Prussian blue and promote the design of high stability Prussian blue in the future.展开更多
To meet the de ma nds of high stability and sustainable temperature measurements over time,TIPC-CAS in China and LNE-Cnam in France have jointly developed single-pressure refractive-index gas thermometiy(SPR1GT),which...To meet the de ma nds of high stability and sustainable temperature measurements over time,TIPC-CAS in China and LNE-Cnam in France have jointly developed single-pressure refractive-index gas thermometiy(SPR1GT),which is expected to be an alternative primary thermometiy because of its 0.25 mK accuracy and high measurement speeds.展开更多
基金the CHMFL(Chinese High Magnetic Field Laboratory)faculty for the operation of the magnet platformsupported by the National Key R&D Program of China(No.2023YFA 1607701)+3 种基金the National Natural Science Foundation of China(Nos.51627901,U1932216,and 12004386)the Maintenance and Renovation Project for CAS Major Scientific and Technological Infrastructure(Nos.DSSWXGZ-2019-0011 and DSSWXGZ-2021-0006)the Chinese Academy of Sciences Scientific Research Equipment(No.YJKYYQ20190014)the Hefei Science Center CAS(No.2021HSC-UE010)。
文摘We have constructed the robust and highfield-stability scanning tunneling microscopy(STM)system which is equipped with a 12 Tsuperconductor magnet and the He-3 cryostat,obtaining the high-quality data of graphite which can be clearly characterized up to the 12-T high magnetic field and bulk 2H-NbSe2 whose vortex structure and surface defects can be clearly visualized by the scanning and dI/dV mapping.The pivotal factor of our superior data stems from the sapphire frame and its unique structure,which ensure an exceptional performance for the noise,which has the current spectral density low to 2×10^(-13)A√Hz at the low frequency with the cut-off frequency of 250 Hz and the engaging status,of vibration,promising to the robust platform for the investigation of the surface of materials.The low drifting rate from the image of graphite is v_(x)=-8:79×10^(-7)nm/s and v_(y)=-3.26×10^(-6)nm/s at 12 T and 0.3 K.Besides,equipped with the high-capacity He-3 cryostat(with 15 normal temperature and pressure liter He-3 gas),the system,which has the base temperature for 0.28 K,can operate at the low temperature for more than 72 h,ensuring the enduring research at the sub-Kelvin temperature for the dI/dV mapping and large-scale scanning.When the magnetic field is applied up to 12 T,the STM system also obtains the excellent-clarity and undistorted images of graphite,which proves the outstanding performance of the system at the high-field researches.
基金financially supported by the National Key Research and Development Program of China(2022YFA1505700,2019YFA0210403)the National Natural Science Foundation of China(52102216)+4 种基金the Natural Science Foundation of Fujian Province(2022J01625,2022-S-002)the Anhui Key Laboratory of Nanomaterials and Nanotechnology,the Major Science and Technology Projects in Anhui Province(202305a12020006)the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry(2025-22)the Innovation Training Program for College Students(cxxl-2024131,cxxl-2024136)support by Transmission Electron Microscope Platform and High-performance Computing Platform of Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China。
文摘Layered V_(2)O_(5) cathode holds the merits of high theoretical specific capacity(589 mA h g^(-1))in aqueous zinc-ion batteries(AZIBs),yet it still suffers from inferior bulk conductivity and structure degradation notably during prolonged cycling.Herein,we ingeniously design cations(Na^(+)/Co^(2+)/Al^(3+))and anion(F^(-))synergistic-doped hydrated V_(2)O_(5)·0.48H_(2)O cathode(VNACOF)to enhance the electronic and spatial effects in the bulk.A range of in-situ,ex-situ characterizations,and DFT calculations profoundly clarify the strengthened ionic/electronic conductivities,structural stability,and Zn^(2+)diffusion kinetics.As a result,the VNACOF displays a superior discharge capacity(529 mA h g^(-1)@0.1 C),rate capabilities(488 mA h g^(-1)@0.5 C,437 mA h g^(-1)@1C),and cycling stability(301 mA h g^(-1)@10 C@5000 cycles@93%)with sufficient energy density(393 W h kg^(-1)),Furthermore,the pouch-cells with high-load(60 mg)also deliver superior cyclic(2 C@178 mA h g^(-1)@1000 cycles@90%)and rate performance(132 mA h g^(-1)@5 C),revealing great application potential for high-energy-density and high-stability AZIBs.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11604350 and 61405211
文摘We demonstrate a novel picosecond optical parametric preamplification to generate high-stability, high-energy and high-contrast seed pulses. The 5ps seed pulse is amplified from 60pJ to 300μJ with an 8.6ps/ 3mJ pump laser in a signal stage of short pulse non-collinear optical parametric chirped pulse amplification. The total gain is more than 106 and the rms energy stability is under 1.35%. The contrast ratio is higher than 10s within a scale of 20ps before the main pulse. Consequently, the improvement factor of the signal contrast is approximately equal to the gain 106 outside the pump window.
基金supported by National Natural Science Foundation of China(52372180,92572105)The Natural Science Foundation of Jiangsu Province(BK20250069)+3 种基金Project on Carbon Emission Peak and Neutrality of Jiangsu Province(BE2022031-4)the Fundamental Research Funds for the Central Universities(2242022K40001)The Start-up Research Fund of Southeast University(RF1028623081)Natural Science Foundation of Chongqing(CSTB2025NSCQ-GPX0662).
文摘Lithium metal batteries(LMBs)have attracted huge attention due to super-high capacity and low reduction potential of lithium anode constructing high-energy/power density.However,the practical application of LMBs is significantly constrained by lithium dendrite growth and high reactivity of lithium anode.Herein,a novel functionalized interlayer that SbF3 is tandem on HKUST-1 skeleton forming favorable Sb-terminated groups structure(HKSF@PE),which were proposed and fabricated to construct highly stable LMBs.Theoretical calculations demonstrate that the Sb-terminated groups structure in this configuration display strong interaction with lithium,which can act as a cation receptor and adsorption sites,thereby promoting lithium-ion desolvation and improving lithium-ion transport kinetics.Meanwhile,in-situ XRD,Raman,and DRT analyses indicate that the HKSF assist the formation of LiF-rich and lithiophilic Li3Sb alloys at SEI/Li interface,regulating lithium depo-sition morphology and reconstructing a reinforced SEI interlayer.Consequently,Li|HKSF@PE|Li symmetric cell exhibits exceptional stability over 2500 h at 2 mA cm^(-2) with 1 mAh cm^(-2),and Li|HKSF@PE|LFP full cell demonstrates a high-capacity retention of 92.0%after 220 cycles even at a high rate of 5C.This work reveals the important role of terminated groups to achieve homogeneous lithium deposition and provide a way to construct stable LMBs.
基金supported by the National Natural Science Foundation of China(Nos,61404076,61474068)the Zhejiang Provincial Natural Science Foundation of China(No.LQ14F040001)+3 种基金the S&T Plan of Zhejiang Provincial Science and Technology Department(No.2015C31010)the China Spark Program(No.2015GA701053)the Ningbo Natural Science Foundation(Nos.2014A610148,2015A610107)the K.C.Wong Magna Fund in Ningbo University,China
文摘In modern microprocessors, the multi-port register file is one of the key modules which provides fast and multiple data access for instructions. As the number of access ports in register files increases, stability becomes a key issue due to the voltage fluctuation on bit lines. We propose to apply an isolated inverter to address the voltage fluctuation. To assess the register stability, we derive a closed-form expression of static noise margin （SNM） for our register file. The proposed SNM model can be used as a guideline to predict the impact of several register parameters on the stability and optimize register file designs. To validate the proposed SNM model, we fabricated a test chip of two-write-four-read （2W4R） 1024 bits register file in a TSMC 65 nm low-power CMOS technology. The experimental result shows that the stability of our register file cells with an isolated inverter improve the conventional cells by approximately 2.4 times. Also, the supply voltage causes a fluctuation of SNM of about 65%, while temperature and transistor mismatch cause a fluctuation of SNM of about 20%.
基金the National Natural Science Foundation of China(Nos.22109060,52071171,and 52202248)the 2021 Annual Scientific Research Funding Project of the Educational Department of Liaoning Province(No.LJKZ0101)+7 种基金Liaoning BaiQianWan Talents Program(No.LNBQW2018B0048)Shenyang Science and Technology Project(No.21-108-9-04)Young Scientific and Technological Talents Project of the Department of Education of Liaoning Province(No.LQN202008)Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization,Anhui University of Technology(No.CHV22-05)Australian Research Council(ARC)through Future Fellowship(Nos.FT210100298 and FT210100806)Discovery Project(No.DP220100603)Linkage Project(No.LP210100467,LP210200504,and LP210200345)Industrial Transformation Training Centre(No.IC180100005)schemes,CSIRO Energy Centre and Kick-Start Project.
文摘Due to the high theoretical capacity and electrode potential,Prussian blue is regarded as promising cathode material for potassium ion batteries.However,inferior structural stability,poor electronic conductivity,ambiguous energy storage mechanism have limited the application of Prussian blue materials.Herein,a highly stable Prussian blue-polypyrrole(PB-PPY)composite has been prepared by a facile one-step method.PB-PPY displays higher discharging capacity,better rate capacity,and longer cycling lifespan than that of pure Prussian blue in potassium ion batteries.The superior electrochemical performance can be attributed to the unique synthesis strategy to reduce the content of vacancies and crystal water in Prussian blue and enhance the conductivity.Furthermore,partial K ions have been evidenced that could remain in the Prussian blue framework,which contributes the long-term cycling stability.The K ions in the framework play the role of“pillars”to support the framework of Prussian blue and relieve the structural stress during the intercalation and de-intercalation of K ions.This work will reveal a new energy storage mechanism of Prussian blue and promote the design of high stability Prussian blue in the future.
基金supported by the National Key R&D Program of China(2016YFE0204200)the National Natural Science Foundation of China(51627809)+2 种基金the International Partnership Program of the Chinese Academy of Sciences(1A1111KYSB20160017)the European Metrology Research Programme(EMRP)(InK2)(No.15SIB02)the China Postdoctoral Science Foundation(2017LH031)
文摘To meet the de ma nds of high stability and sustainable temperature measurements over time,TIPC-CAS in China and LNE-Cnam in France have jointly developed single-pressure refractive-index gas thermometiy(SPR1GT),which is expected to be an alternative primary thermometiy because of its 0.25 mK accuracy and high measurement speeds.
