In this work,a series of low-cost,stable,and highly efficient composite counter electrodes(CEs)in threedimensional(3D)structure have been designed with multi-wall carbon nanotubes(MWCNTs)as the framework for carrier t...In this work,a series of low-cost,stable,and highly efficient composite counter electrodes(CEs)in threedimensional(3D)structure have been designed with multi-wall carbon nanotubes(MWCNTs)as the framework for carrier transport and nanographite or CuS nanoparticles loaded on carbon tubes as catalytic active sites.CuS nanoparticles are synthesized by loading on acid-treated MWCNTs in various routes to optimize the 3D CE interface and microstructure.The photovoltaic properties,including stability,are investigated and compared within Pt,MWCNT,nanographite/MWCNT,and CuS/MWCNT CEs based on the characterization(SEM,TEM,XRD,EELS,and IR spectrum),electrochemical impedance spectroscopy(EIS),Tafel curve,incident photon-to-current conversion efficiency(IPCE),and optical current density–voltage curve under one sun.The result shows that one-step synthesized CuS/acid-treated MWCNT CE overcomes all other electrodes on both the photovoltaic property and stability in QDSCs at identical conditions and is a potential candidate for commercial CEs of solar cells for mass production.展开更多
基金financially supported by the Heilongjiang Province Natural Science Fund(Grant No.E2018044).
文摘In this work,a series of low-cost,stable,and highly efficient composite counter electrodes(CEs)in threedimensional(3D)structure have been designed with multi-wall carbon nanotubes(MWCNTs)as the framework for carrier transport and nanographite or CuS nanoparticles loaded on carbon tubes as catalytic active sites.CuS nanoparticles are synthesized by loading on acid-treated MWCNTs in various routes to optimize the 3D CE interface and microstructure.The photovoltaic properties,including stability,are investigated and compared within Pt,MWCNT,nanographite/MWCNT,and CuS/MWCNT CEs based on the characterization(SEM,TEM,XRD,EELS,and IR spectrum),electrochemical impedance spectroscopy(EIS),Tafel curve,incident photon-to-current conversion efficiency(IPCE),and optical current density–voltage curve under one sun.The result shows that one-step synthesized CuS/acid-treated MWCNT CE overcomes all other electrodes on both the photovoltaic property and stability in QDSCs at identical conditions and is a potential candidate for commercial CEs of solar cells for mass production.
