材料科学
光电流
电极
基质(水族馆)
赤铁矿
图层(电子)
可逆氢电极
电子
氧化物
电子转移
电子传输链
工作职能
光电子学
化学工程
电解质
纳米技术
光化学
参比电极
化学
冶金
工程类
物理化学
地质学
量子力学
生物化学
海洋学
物理
作者
Chunmei Ding,Zhiliang Wang,Jingying Shi,Tingting Yao,Ailong Li,Pengli Yan,Baokun Huang,Can Li
标识
DOI:10.1021/acsami.5b12818
摘要
The photoelectrochemical water oxidation efficiency of photoanodes is largely limited by interfacial charge-transfer processes. Herein, a metal oxide electron-transport layer (ETL) was introduced at the substrate-electrode interface. Hematite photoanodes prepared on Li(+)- or WO3-modified substrates deliver higher photocurrent. It is inferred that a Li-doped Fe2O3 (Li:Fe2O3) layer with lower flat band potential than the bulk is formed. Li:Fe2O3 and WO3 are proved to function as an expressway for electron extraction. Via introducing ETL, both the charge separation and injection efficiencies are improved. The lifetime of photogenerated electrons is prolonged by 3 times, and the ratio of surface charge transfer and recombination rate is enhanced by 5 times with Li:Fe2O3 and 125 times with WO3 ETL at 1.23 V versus reversible hydrogen electrode. This result indicates the expedited electron extraction from photoanode to the substrate can suppress not only the recombination at the back contact interface but also those at the surface, which results in higher water oxidation efficiency.
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