光电阴极
光电流
异质结
纳米线
材料科学
分解水
光电子学
载流子
密度泛函理论
退火(玻璃)
纳米技术
化学
光催化
计算化学
物理
电子
量子力学
复合材料
催化作用
生物化学
作者
Yusheng Zeng,Jiawei Xue,He Mei,Chuanhao Li,Weiju Zhu,Shikuo Li
标识
DOI:10.1016/j.electacta.2020.137426
摘要
We investigated the interfacial charge transfer driven by the buried p-n junctions in Cux[email protected]2 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 Cux[email protected]2 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 Cux[email protected]2 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.
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