光电阴极
材料科学
纳米片
光电流
过电位
电化学
分解水
光电子学
电解质
纳米技术
电极
电子
物理化学
物理
光催化
催化作用
化学
量子力学
生物化学
作者
Linxing Meng,Jinlu He,Wei Tian,Meng Wang,Run Long,Liang Li
标识
DOI:10.1002/aenm.201902135
摘要
Abstract The photo‐electrochemical performance of the Si photocathode is seriously restricted by the severe charge recombination at the Si/electrolyte interface and sluggish hydrogen evolution reaction (HER) kinetics. Herein, a facile hydrothermal process is reported to integrate Ni/Fe codoped In 2 S 3 nanosheet arrays onto the surface of unmodified a p‐Si photocathode for water reduction. The experimental results and density functional theory calculations indicate that the Ni and Fe codoping of In 2 S 3 contributes to small surface transfer impedance, prolonged carrier lifetime, increased charge carrier concentration, and reduced overpotential for HER. Moreover, a p–n junction formed at the interface of Si and Ni/Fe:In 2 S 3 promotes the photogenerated electron–hole separation and reduces the recombination in the bulk. As a result, the Si–Ni/Fe:In 2 S 3 photocathode exhibits high performance with significantly enhanced photocurrent of −80.9 mA cm −2 at −1.3 V RHE and positive onset potential of 0.44 V RHE .
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