Copper/cuprous sulfide electrode: preparation and performance  

作　　者：Lina Xiao Ding Yuan Pei Li Li Huang Bing-Wei Mao Dongping Zhan 

机构地区：[1]State Key Laboratory for Physical Chemistry of Solid Surfaces [2]Department of Chemistry,College of Chemistry and Chemical Engineering, Xiamen University

出　　处：《Science China Chemistry》2015年第6期1039-1043,共5页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2012CB932902,2011CB933700);the National Natural Science Foundation of China(21321062,21061120456);the Natural Science Foundation of Fujian Province of China(2012J06004);the Program for New Century Excellent Talents in University(NCET-12-0318)

摘　　要：Cuprous sulfide （Cu2S） is a direct band-gap p-type semiconductor with excellent ionic/electronic hybrid conductivity. Alt- hough Cu/Cu2S/sulfide or polysulfide system is adopted as counter electrode of quantum-dots-sensitized solar cells （QDSSC）, the electrode process is seldom reported. Here, the electrochemical growth of Cu2S film on a copper （Cu） surface, the redox behaviors of sulfide and polysulfide, and the all-in-solid charge-transfer properties of Cu2S film are investigated. It is clarified that the copper electrode simultaneously undergoes an activated process, a membrane growth process, and a redox phase transformation process. The solid charge-transfer capability of CuzS is quantified with a high exchange-current density of 2.27 A/cm2, which elucidates that the Cu/CuzS electrode is a qualified material for counter electrodes of QDSSC. These results aid understanding of the physicochemical mechanism of QDSSC with a polysulfide electrolyte and Cu/Cu2S counter electrode.Cuprous sulfide(Cu2S) is a direct band-gap p-type semiconductor with excellent ionic/electronic hybrid conductivity. Although Cu/Cu2S/sulfide or polysulfide system is adopted as counter electrode of quantum-dots-sensitized solar cells(QDSSC), the electrode process is seldom reported. Here, the electrochemical growth of Cu2 S film on a copper(Cu) surface, the redox behaviors of sulfide and polysulfide, and the all-in-solid charge-transfer properties of Cu2 S film are investigated. It is clarified that the copper electrode simultaneously undergoes an activated process, a membrane growth process, and a redox phase transformation process. The solid charge-transfer capability of Cu2 S is quantified with a high exchange-current density of 2.27 A/cm2, which elucidates that the Cu/Cu2 S electrode is a qualified material for counter electrodes of QDSSC. These results aid understanding of the physicochemical mechanism of QDSSC with a polysulfide electrolyte and Cu/Cu2 S counter electrode.

关 键 词：quantum dots sensitized solar cells counter electrode cuprous sulfide film growth 

分 类 号：O646.54[理学—物理化学]