Acid-treated Ti4 doped hematite photoanode for efficient solar water oxidation-Insight into surface states and charge separation
Acid-treated Ti4 doped hematite photoanode for efficient solar water oxidation-Insight into surface states and charge separation
复制标题
用于高效太阳能水氧化的酸处理 Ti4 掺杂赤铁矿光电阳极 - 深入了解表面态和电荷分离
DOI：
10.1016/j.jallcom.2018.12.171
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发表时间：
2019
影响因子：
6.2
通讯作者：
Xie Tengfeng
中科院分区：
文献类型：
--
作者：
Wu Qiannan;Meng Dedong;Zhang Yu;Zhao Qidong;Bu QiJing;Wang Dejun;Zou Xiaoxin;Lin Yanhong;Li Shuo;Xie Tengfeng
Acid-treatment has been proved to be an efficient approach to improve the photoelectrochemical (PEC) performance of hematite. However, efforts to optimize hematite photoanode have been limited by an inadequate understanding of the semiconductor surface. Here we make efforts to understand the microscopic charge separation processes of Ti4+doped Fe2O3photoanode before and after acid-treatment. Surface photovoltage (SPV) transient and the work function measurements directly reveal that acid-treatment leads to passivation of the surface states. Surface photovoltage (SPV) spectroscopic studies coupled to open-circuit photovoltage (OPV) measurements indicate that the surface states of hematite photoanode before acid-treatment result in the pinning of the Fermi level, which reduce the intensity of interfacial electric field at the semiconductor-electrolyte interface.
