Electrochemical impedance spectroscopy of self-assembling cyclic peptide membrane bonded Ca2+in the solution of [Fe（CN）6]3-/4-at different times were determined.The results indicated that the relation of resistance ...Electrochemical impedance spectroscopy of self-assembling cyclic peptide membrane bonded Ca2+in the solution of [Fe（CN）6]3-/4-at different times were determined.The results indicated that the relation of resistance of membrane and the time of immersing in CaCl2 solution manifested deferent rule with the content of CaCl2 solution.According to experimental results,the manner of CPCBC molecule bonded to Ca2+ was supposed.展开更多
A Pt-free counter electrode(CE)composed of La_(2)Mo_(2)O_(7)(La_(2)O_(3)-2MoO_(2))was successfully synthesized via the simple pyrolysis of lanthanum acetate(C6H9O6La·xH2O)and hexaammonium heptamolybdate tetrahydr...A Pt-free counter electrode(CE)composed of La_(2)Mo_(2)O_(7)(La_(2)O_(3)-2MoO_(2))was successfully synthesized via the simple pyrolysis of lanthanum acetate(C6H9O6La·xH2O)and hexaammonium heptamolybdate tetrahydrate((NH_(4))6Mo_(7)O_(24)·4H2O)in a high-temperature solid-state reaction.Also,La_(2)Mo_(2)O_(7)and multiwall carbon nanotubes(MWCNTs)are combined using two methods.La_(2)Mo_(2)O_(7)/MWCNTs was prepared by spray-coating La_(2)Mo_(2)O_(7)over the surface of MWCNTs,and La_(2)Mo_(2)O_(7)@MWCNTs was synthesized by doping La_(2)Mo_(2)O_(7)into MWCNTs.The two types of composite materials were further used as Pt-free catalytic material in CEs in dye sensitized solar cells(DSSCs).The morphology and microstructure of La_(2)Mo_(2)O_(7)/MWCNTs and La_(2)Mo_(2)O_(7)@MWCNTs were determined using scanning electron microscopy and X-ray diffraction.The electrochemical performance of the La_(2)Mo_(2)O_(7)/MWCNTs and La_(2)Mo_(2)O_(7)@MWCNTs composite catalysts for CEs was determined using photocurrent-voltage measurements,cyclic voltammetry,electrochemical impedance spectroscopy,and Tafel polarization in encapsulation of DSSCs batteries.The experimental results show that power conversion efficiencies of 6.09%and 4.84%were obtained for La_(2)Mo_(2)O_(7)/MWCNTs and La_(2)Mo_(2)O_(7)@MWCNTs,respectively,as CEs toward the reduction of I3-/I-ions,and these values are superior to those of MWCNTs(3.94%)and the La_(2)Mo_(2)O_(7)(0.87%)electrode under the same conditions.The enhanced electrode performance was attributed to the relatively larger surface area and higher conductivity of the La_(2)Mo_(2)O_(7)/MWCNTs composite catalysts.展开更多
文摘Electrochemical impedance spectroscopy of self-assembling cyclic peptide membrane bonded Ca2+in the solution of [Fe（CN）6]3-/4-at different times were determined.The results indicated that the relation of resistance of membrane and the time of immersing in CaCl2 solution manifested deferent rule with the content of CaCl2 solution.According to experimental results,the manner of CPCBC molecule bonded to Ca2+ was supposed.
文摘A Pt-free counter electrode(CE)composed of La_(2)Mo_(2)O_(7)(La_(2)O_(3)-2MoO_(2))was successfully synthesized via the simple pyrolysis of lanthanum acetate(C6H9O6La·xH2O)and hexaammonium heptamolybdate tetrahydrate((NH_(4))6Mo_(7)O_(24)·4H2O)in a high-temperature solid-state reaction.Also,La_(2)Mo_(2)O_(7)and multiwall carbon nanotubes(MWCNTs)are combined using two methods.La_(2)Mo_(2)O_(7)/MWCNTs was prepared by spray-coating La_(2)Mo_(2)O_(7)over the surface of MWCNTs,and La_(2)Mo_(2)O_(7)@MWCNTs was synthesized by doping La_(2)Mo_(2)O_(7)into MWCNTs.The two types of composite materials were further used as Pt-free catalytic material in CEs in dye sensitized solar cells(DSSCs).The morphology and microstructure of La_(2)Mo_(2)O_(7)/MWCNTs and La_(2)Mo_(2)O_(7)@MWCNTs were determined using scanning electron microscopy and X-ray diffraction.The electrochemical performance of the La_(2)Mo_(2)O_(7)/MWCNTs and La_(2)Mo_(2)O_(7)@MWCNTs composite catalysts for CEs was determined using photocurrent-voltage measurements,cyclic voltammetry,electrochemical impedance spectroscopy,and Tafel polarization in encapsulation of DSSCs batteries.The experimental results show that power conversion efficiencies of 6.09%and 4.84%were obtained for La_(2)Mo_(2)O_(7)/MWCNTs and La_(2)Mo_(2)O_(7)@MWCNTs,respectively,as CEs toward the reduction of I3-/I-ions,and these values are superior to those of MWCNTs(3.94%)and the La_(2)Mo_(2)O_(7)(0.87%)electrode under the same conditions.The enhanced electrode performance was attributed to the relatively larger surface area and higher conductivity of the La_(2)Mo_(2)O_(7)/MWCNTs composite catalysts.
