Investigation of interfacial charge transfer in CuxO@TiO2 heterojunction nanowire arrays towards highly efficient solar water splitting.
- 影响因子：6.901
- DOI码：10.1016/j.electacta.2020.137426
- 发表刊物：Electrochim. Acta
- 关键字：Photoelectrochemical water splitting, p-n junction, Interfacial charge transfer
- 摘要：We investigated the interfacial charge transfer driven by the buried p-n junctions in Cu O-x@TiO2 nanowires for solar water splitting. The interfacial p-n junctions in the nanowire are constructed by a novel integrating in situ oxidation and thermal annealing method. The interfacial heterojunctions accelerate the transfer of photogenerated charge carriers and provide thickness controllable protective layer for CuxO nanowires suffering from photocorrsion. The optimized CuxO@TiO2 photocathode achieves a remarkable photocurrent density of -2.43 mA.cm(-2) at 0 V versus a reversible hydrogen electrode (RHE), which is approximately two times of the bare CuxO photocathode (-1.12 mA.cm(-2) at 0 V vs RHE). And the heterojunction photocathode displays a durable cathodic current with a slight decay of 9.3% over 3 h under continuous illumination. The effects of interfacial p-n junctions in CuxO@TiO2 nanowires in improving photogenerated charge carrier transfer were further disclosed by X-ray absorption spectroscopy (XAS) analysis and density functional theory (DFT) calculation. This work might afford a promising insight in understanding the mechanism of interfacial charge transfer towards designing highly efficient photoelectrodes for solar water splitting. (C) 2020 Elsevier Ltd. All rights reserved.
- 合写作者：Mei He, Chuanhao Li, Weiju Zhu
- 第一作者：Yusheng Zeng, Jiawei Xue
- 通讯作者：Shikuo Li
- 文献类型：SCI
- 卷号：367
- 页面范围：137426
- 是否译文：否
- 发表时间：2021/01/20
- 发布期刊链接：https://www.sciencedirect.com/science/article/abs/pii/S0013468620318193
