Polycrystalline BiFeO3 and rare earth substituted Bio.gRo.lFeO3 （BRFO, R=Y, Ho and Er） compounds were prepared by rapid solid state sintering technique. Structural phase analysis indicated that all the compounds sta...Polycrystalline BiFeO3 and rare earth substituted Bio.gRo.lFeO3 （BRFO, R=Y, Ho and Er） compounds were prepared by rapid solid state sintering technique. Structural phase analysis indicated that all the compounds stabilized in rhombohedral structure （R3c space group） and a small orthorhombic phase fraction was observed in BRFO compounds. From the Raman spectra results, the changes in the phonon frequencies （A1） and line widths suggested lattice distortion in the BRFO compounds as was evidenced in the XRD analysis. Compared to the linear variation of magnetization with magnetic field （M-H） shown by BFO, an obvious M-H loop was observed in BRFO compounds which could be due to the suppression of space modulated spin structure and was explained on the basis of weak ferromagnetism and field induced spin reorientation. UV-Vis spectroscopy evidenced a change in local FeO6 envi- ronment due to shift in the 6Alg→4T2g energy transition band. BRFO compounds with improved remnant magnetization and coercive field are applicable for magnetoelectric devices.展开更多
Electroactive anticorrosion coatings are specialized surface treatments that prevent or minimize corrosion. Thestudy employs strategic thermodynamic equilibriumcalculations to pioneer a novel factor in corrosion prote...Electroactive anticorrosion coatings are specialized surface treatments that prevent or minimize corrosion. Thestudy employs strategic thermodynamic equilibriumcalculations to pioneer a novel factor in corrosion protection.A first-time proposal, the total acidity (TA) potential of the hydrogen (pH) concept significantly shapes medicalmagnesium alloys. These coatings are meticulously designed for robust corrosion resistance, blending theoreticalinsights and practical applications to enhance our grasp of corrosion prevention mechanisms and establisha systematic approach to coating design. The groundbreaking significance of this study lies in its innovativeintegration of the TA/pH concept,which encompasses the TA/pH ratio of the chemical environment. This approachsurpasses convention by acknowledging the intricate interplay between the acidity and pH levels within thecoating formulation, thereby optimizing metal-phosphate-based conversion coatings and transforming corrosionmitigation strategies. To authenticate the TA/pH concept, the study comprehensively compares its findings withexisting research, rigorously validating the theoretical framework and reinforcing the correlates among TA/pHvalues and observed corrosion resistance in the coatings. The influence of mutations that occur naturally inthe detergent solution on persistent phosphorus changes is shown by empirical confirmation, which improvescorrosion resistance. This realization advances the field ofmaterials and the field’s knowledge of coated generation,particularly anticorrosion converter layers.展开更多
Interfacial engineering of two-dimensional(2D)monometallic phosphides enables remarkable structural and electrochemical properties in energy storage devices.Herein,2D nanosheets(NSs)of FeP_(2)/Co_(2) P were grown on N...Interfacial engineering of two-dimensional(2D)monometallic phosphides enables remarkable structural and electrochemical properties in energy storage devices.Herein,2D nanosheets(NSs)of FeP_(2)/Co_(2) P were grown on Ni-foam(FCP)using a solution-based and phosphorization approach to be used as freestanding for high-performance energy storage devices.An effective phosphorization strategy is successfully de-veloped to improve the overall crystalline phase,tailor the morphology,and boost the electrochemical performances of electrodes.The FCP NSs electrode exhibits a battery-type redox behavior with a maxi-mum high areal capacity of 1.96 C cm^(-2) at 4 mA cm^(-2) in 6 M KOH aqueous electrolyte compared to the other counterparts.The superior electrochemical performance was achieved by increasing the electroac-tive sites and high conductivity via surface tailoring and fast redox reactions.Moreover,a supercapattery was assembled utilizing FCP and activated carbon(AC)electrodes and it revealed maximum specific en-ergy(E_(s))and specific power(P_(s))of 41.2 Wh kg^(-1) and 7578 W kg^(-1) with good cycling stability of 91%after 10,000 cycles at 5 A g^(-1).Eventually,the supercapattery has been explored in practical applications by lighting up light-emitting diodes(LEDs),representing the real-time performance of superior energy storage devices.展开更多
Activated carbon derived from biomass is an environmentally friendly and low-cost supercapacitor electrode material.The diverse morphology and pore shape of activated carbon have a significant impact on enhancing the ...Activated carbon derived from biomass is an environmentally friendly and low-cost supercapacitor electrode material.The diverse morphology and pore shape of activated carbon have a significant impact on enhancing the storage capacity of supercapacitors.However,the disparate distribution of pore sizes in activated carbon has a negative effect on energy density.In the present study,the synthesis and modification of the carbon pore structure of Manihot esculenta tuber and Bambusa blumeana stem was carried out using a sonochemical-assisted hydrothermal method with various chemicals(0.06 M KOH,0.06 M PVP,0.06 M ZnCl_(2)).The 3D pore structure of the sample modified with 0.06 M ZnCl_(2)exhibited a well-defined microporous architecture and a substantial specific surface area of 516.29 m^(2)g^(-1),leading to excellent electrochemical performance in coin cell supercapacitors.A high power density of 1086.12 Wkg^(-1)at a voltage window of 2 V has been attained,with a corresponding current density of 0.3 Ag^(-1).Remarkably,after 5000 charge and discharge cycles,the capacitance retention was maintained at 90.8%.The high power density produced from biomass activated carbon based on Manihot esculenta tuber and Bambusa blumeana stem modified using 0.06 M ZnCl_(2)provides a practical approach for environmentally friendly electrical energy storage devices and realizes rapid mass transportation.展开更多
This paper deals with an in-depth analysis on the role of the microstructure phase of titanium dioxide(TiO_(2))precursor in sodium bismuth titanate(Na_(0.5)Bi_(0.5)TiO_(3),hereafter represented as NBT)ceramics prepare...This paper deals with an in-depth analysis on the role of the microstructure phase of titanium dioxide(TiO_(2))precursor in sodium bismuth titanate(Na_(0.5)Bi_(0.5)TiO_(3),hereafter represented as NBT)ceramics prepared through the hydrothermal method.The comparison of the grain size,microstructure,crystal structure,and electrical properties of the NBT ceramics is carried out using anatase and rutile TiO_(2).NBT ceramics with anatase TiO_(2)(denoted by NBT_(A))displayed superior dielectric and ferro/piezoelectric properties along with the additional functionality in terms of photocatalysis.Systematic studies of functional properties such as piezoelectric,ferroelectric,and dielectric stressed the far-reaching influence of effects on grain size.The mechanisms and functional properties of grain quantitative effects are also discussed.Grain boundaries volume fraction increment has decreased the dielectric peak but increased the diffusiveness in the case of the NBT with rutile TiO_(2) precursor(denoted as NBT_(R)).Similarly,elastic stiffness increment restricts the movement of the domain wall and led to a decrement in remnant polarization along with an increase in the values of the corresponding piezoelectric coefficient in finegrain NBT_(R) samples.展开更多
In this work,the dependency of the polarization(P)-electric field(E)loop area A of lead free ferro-electrics Na_(0.5)Bi_(0.5)TiO_(3)(NBT), K_(0.5)Bi_(0.5)TiO_(3)(KBT),and Na_(0.25)K_(0.25)Bi_(0.5)TiO_(3)(NKBT)on the a...In this work,the dependency of the polarization(P)-electric field(E)loop area A of lead free ferro-electrics Na_(0.5)Bi_(0.5)TiO_(3)(NBT), K_(0.5)Bi_(0.5)TiO_(3)(KBT),and Na_(0.25)K_(0.25)Bi_(0.5)TiO_(3)(NKBT)on the amplitude(E0)of the electric field is studied.Based on the nature of the hysteresis loop with increasing E0,the lnA versus lnE0 graph is divided into three stages and the scaling exponents of each stage are estimated.In the third stage,NBT,KBT,and NKBT show different shapes of P-E loops(square,slanted and pinched,respectively).Although,almost similar slopes in the third stage are obtained from the lnA versus lnE0 graphs of KBT and NKBT,the formation of pinched P-E loop of NKBT is discussed based on the current-time curve under a complete cycle of the applied electric field.The shape of the P-E loop also affects the recoverable energy storage density(Wrec)of the material.Similar to the scaling of A,the variation of lnWrec with lnE0 of NBT,KBT and NKBT are examined.Interestingly,three stages are only noticed in the lnWrec-lnE0 curve of pinched P-E loop(NKBT),whereas lnWrec linearly increases with lnE0 for square and slanted P-E loop.Such type of behavior of Wrec of NKBT is explained based on the reversible domain switching mechanism of the pinched P-E loop.展开更多
基金supported by Department of Science and Technology (DST),Government of India under Fast Track Scheme (SR/FTP/PS-065/2011)
文摘Polycrystalline BiFeO3 and rare earth substituted Bio.gRo.lFeO3 （BRFO, R=Y, Ho and Er） compounds were prepared by rapid solid state sintering technique. Structural phase analysis indicated that all the compounds stabilized in rhombohedral structure （R3c space group） and a small orthorhombic phase fraction was observed in BRFO compounds. From the Raman spectra results, the changes in the phonon frequencies （A1） and line widths suggested lattice distortion in the BRFO compounds as was evidenced in the XRD analysis. Compared to the linear variation of magnetization with magnetic field （M-H） shown by BFO, an obvious M-H loop was observed in BRFO compounds which could be due to the suppression of space modulated spin structure and was explained on the basis of weak ferromagnetism and field induced spin reorientation. UV-Vis spectroscopy evidenced a change in local FeO6 envi- ronment due to shift in the 6Alg→4T2g energy transition band. BRFO compounds with improved remnant magnetization and coercive field are applicable for magnetoelectric devices.
基金the below mentioned organisation:Key Research and Development Special Project of Henan Provincial Science and Technology(222102230025)Key Research and Development Special Project of Henan Provincial Science and Technology(232102231015)+2 种基金Key Research and Development Special Project of Henan Provincial Science and Technology(232102231011)Natural Science Foundation of Henan Province(No.004053100)Major Science Research Project of High Education of Henan Province(No.23B430016).
文摘Electroactive anticorrosion coatings are specialized surface treatments that prevent or minimize corrosion. Thestudy employs strategic thermodynamic equilibriumcalculations to pioneer a novel factor in corrosion protection.A first-time proposal, the total acidity (TA) potential of the hydrogen (pH) concept significantly shapes medicalmagnesium alloys. These coatings are meticulously designed for robust corrosion resistance, blending theoreticalinsights and practical applications to enhance our grasp of corrosion prevention mechanisms and establisha systematic approach to coating design. The groundbreaking significance of this study lies in its innovativeintegration of the TA/pH concept,which encompasses the TA/pH ratio of the chemical environment. This approachsurpasses convention by acknowledging the intricate interplay between the acidity and pH levels within thecoating formulation, thereby optimizing metal-phosphate-based conversion coatings and transforming corrosionmitigation strategies. To authenticate the TA/pH concept, the study comprehensively compares its findings withexisting research, rigorously validating the theoretical framework and reinforcing the correlates among TA/pHvalues and observed corrosion resistance in the coatings. The influence of mutations that occur naturally inthe detergent solution on persistent phosphorus changes is shown by empirical confirmation, which improvescorrosion resistance. This realization advances the field ofmaterials and the field’s knowledge of coated generation,particularly anticorrosion converter layers.
基金supported by Basic Science Research Pro-gram through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2014R1A6A1030419)supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2020112382).
文摘Interfacial engineering of two-dimensional(2D)monometallic phosphides enables remarkable structural and electrochemical properties in energy storage devices.Herein,2D nanosheets(NSs)of FeP_(2)/Co_(2) P were grown on Ni-foam(FCP)using a solution-based and phosphorization approach to be used as freestanding for high-performance energy storage devices.An effective phosphorization strategy is successfully de-veloped to improve the overall crystalline phase,tailor the morphology,and boost the electrochemical performances of electrodes.The FCP NSs electrode exhibits a battery-type redox behavior with a maxi-mum high areal capacity of 1.96 C cm^(-2) at 4 mA cm^(-2) in 6 M KOH aqueous electrolyte compared to the other counterparts.The superior electrochemical performance was achieved by increasing the electroac-tive sites and high conductivity via surface tailoring and fast redox reactions.Moreover,a supercapattery was assembled utilizing FCP and activated carbon(AC)electrodes and it revealed maximum specific en-ergy(E_(s))and specific power(P_(s))of 41.2 Wh kg^(-1) and 7578 W kg^(-1) with good cycling stability of 91%after 10,000 cycles at 5 A g^(-1).Eventually,the supercapattery has been explored in practical applications by lighting up light-emitting diodes(LEDs),representing the real-time performance of superior energy storage devices.
基金funded by the national competitive grant of Riset Kolaborasi Indonesia 2023 from the Ministry of Higher Education,Research and Technology with a specific grant by Universitas Negeri Malang,Indonesia.
文摘Activated carbon derived from biomass is an environmentally friendly and low-cost supercapacitor electrode material.The diverse morphology and pore shape of activated carbon have a significant impact on enhancing the storage capacity of supercapacitors.However,the disparate distribution of pore sizes in activated carbon has a negative effect on energy density.In the present study,the synthesis and modification of the carbon pore structure of Manihot esculenta tuber and Bambusa blumeana stem was carried out using a sonochemical-assisted hydrothermal method with various chemicals(0.06 M KOH,0.06 M PVP,0.06 M ZnCl_(2)).The 3D pore structure of the sample modified with 0.06 M ZnCl_(2)exhibited a well-defined microporous architecture and a substantial specific surface area of 516.29 m^(2)g^(-1),leading to excellent electrochemical performance in coin cell supercapacitors.A high power density of 1086.12 Wkg^(-1)at a voltage window of 2 V has been attained,with a corresponding current density of 0.3 Ag^(-1).Remarkably,after 5000 charge and discharge cycles,the capacitance retention was maintained at 90.8%.The high power density produced from biomass activated carbon based on Manihot esculenta tuber and Bambusa blumeana stem modified using 0.06 M ZnCl_(2)provides a practical approach for environmentally friendly electrical energy storage devices and realizes rapid mass transportation.
基金CSIR-EMRII(Ref.No.0194/NS)SERB,Department of Science and Technology(CRG/2020/001509)+3 种基金UGC-DAE(CRS-M-250)India,for financial support in carrying out this workCSIR-UGC,India(Fellowship No.518928)for financial supportthe financial support for the following projects no's BRICS/PilotCall2/IEEE-OSC/2018(G)and CRG/2019/003197.
文摘This paper deals with an in-depth analysis on the role of the microstructure phase of titanium dioxide(TiO_(2))precursor in sodium bismuth titanate(Na_(0.5)Bi_(0.5)TiO_(3),hereafter represented as NBT)ceramics prepared through the hydrothermal method.The comparison of the grain size,microstructure,crystal structure,and electrical properties of the NBT ceramics is carried out using anatase and rutile TiO_(2).NBT ceramics with anatase TiO_(2)(denoted by NBT_(A))displayed superior dielectric and ferro/piezoelectric properties along with the additional functionality in terms of photocatalysis.Systematic studies of functional properties such as piezoelectric,ferroelectric,and dielectric stressed the far-reaching influence of effects on grain size.The mechanisms and functional properties of grain quantitative effects are also discussed.Grain boundaries volume fraction increment has decreased the dielectric peak but increased the diffusiveness in the case of the NBT with rutile TiO_(2) precursor(denoted as NBT_(R)).Similarly,elastic stiffness increment restricts the movement of the domain wall and led to a decrement in remnant polarization along with an increase in the values of the corresponding piezoelectric coefficient in finegrain NBT_(R) samples.
基金Author SA gratefully acknowledges the financial support pro-vided by the CSIR-EMRII(Ref.No.0194/NS)SERB,Department of Science and Technology(CRG/2020/001509)India to carry out this work.Author KB acknowledges DST-INSPIRE,India(Fellowship Code No.IF160462)for financial assistance.
文摘In this work,the dependency of the polarization(P)-electric field(E)loop area A of lead free ferro-electrics Na_(0.5)Bi_(0.5)TiO_(3)(NBT), K_(0.5)Bi_(0.5)TiO_(3)(KBT),and Na_(0.25)K_(0.25)Bi_(0.5)TiO_(3)(NKBT)on the amplitude(E0)of the electric field is studied.Based on the nature of the hysteresis loop with increasing E0,the lnA versus lnE0 graph is divided into three stages and the scaling exponents of each stage are estimated.In the third stage,NBT,KBT,and NKBT show different shapes of P-E loops(square,slanted and pinched,respectively).Although,almost similar slopes in the third stage are obtained from the lnA versus lnE0 graphs of KBT and NKBT,the formation of pinched P-E loop of NKBT is discussed based on the current-time curve under a complete cycle of the applied electric field.The shape of the P-E loop also affects the recoverable energy storage density(Wrec)of the material.Similar to the scaling of A,the variation of lnWrec with lnE0 of NBT,KBT and NKBT are examined.Interestingly,three stages are only noticed in the lnWrec-lnE0 curve of pinched P-E loop(NKBT),whereas lnWrec linearly increases with lnE0 for square and slanted P-E loop.Such type of behavior of Wrec of NKBT is explained based on the reversible domain switching mechanism of the pinched P-E loop.
