物理化学学报2017，Vol.33Issue(12)：2454-2462,9.DOI:10.3866/PKU.WHXB201706092
利用强度调制光电流/光电压谱研究碳点/KOH电解液界面的动力学行为
Dynamic Analysis of Carbon Dots/KOH Electrolyte lnterface bylMPS/lMVS
摘要
Abstract
The dynamic behaviors at the interface of carbon dots and KOH electrolyte were studied using intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS) in the photoelectrochemical hydrogen production from water splitting. The results show that the kinetic parameters like electron transport time(τd), electron diffusion coefficient(Dn), electron lifetime(τn),and electron diffusion length(Ln) remainunchangedinthe light intensity range of 30–90mW·cm?2. When the light intensity increases to 110 and 130mW·cm?2,τdandτnincrease, whileDn decreases. It is indicated that the photogenerated electrons are mainly transportedinthe trap-free limited diffusion modeat the electrode/electrolyte interface due to the presence of few defects in carbon dots, whichis different from the mode of transport at the semiconductor TiO2/electrolyte interface. Moreover, the photocarrier collection efficiencies(ηcc)associated with the electron transport time and the electron lifetime are similar for light intensity of 30–130mW·cm?2.关键词
碳点/光电制氢/界面动力学/IMPS/IMVSKey words
Carbon dots/Photoelectrochemical hydrogen production/Interface dynamic/IMPS/IMVS分类
化学化工引用本文复制引用
桑丽霞,蔺佳,葛昊,雷蕾..利用强度调制光电流/光电压谱研究碳点/KOH电解液界面的动力学行为[J].物理化学学报,2017,33(12):2454-2462,9.基金项目
The project was supported by the National Natural Science Foundation of China (51376013).国家自然科学基金(51376013)资助项目 （51376013）
