Hu Zirui, Wang Ruoyu, Han Changcun, Chen Ruolin
School of Science, Hubei University of Technology, No. 28, Nanli Road, Hong-shan District, Wuhan 430068, PR China.
School of Science, Hubei University of Technology, No. 28, Nanli Road, Hong-shan District, Wuhan 430068, PR China.
J Colloid Interface Sci. 2022 Dec 15;628(Pt B):946-954. doi: 10.1016/j.jcis.2022.08.099. Epub 2022 Aug 17.
The photoelectrocatalytic (PEC) water splitting efficiency of semiconductor photoelectrodes is mainly limited by the effective separation and transfer of photogenerated charges. Zinc indium sulfide-cuprous oxide (ZnInS-CuO) p-n heterojunction is constructed to enhance the PEC properties of ZnInS. The nickel hydroxide iron oxide (NiFeOOH) layer on the surface of the heterojunction can be used as a hole depletion layer under the induction of plasmon resonance of the most surface silver (Ag) (the holes transferred from CuO valence band to NiFeOOH layer can be excited by Ag to produce hot electron consumption, which makes the last remaining hot holes participate in the water oxidation reaction) to further promote the carrier separation and transfer. The results exhibit that ZnInS/CuO/NiFeOOH/Ag photoelectrode with dramatically enhanced photocurrent density of 1.22 mA/cm at 1.23 V versus the reversible hydrogen electrode (V), which is 9.4 times higher than the pure ZnInS. This work provides a promising concept to design photoelectrodes efficiently in PEC water splitting.
半导体光电极的光电催化（PEC）水分解效率主要受光生电荷有效分离和转移的限制。构建硫化锌铟 - 氧化亚铜（ZnInS - CuO）p - n异质结以增强ZnInS的PEC性能。异质结表面的氢氧化镍氧化铁（NiFeOOH）层在最表面银（Ag）的等离子体共振诱导下可作为空穴耗尽层（从CuO价带转移到NiFeOOH层的空穴可被Ag激发产生热电子消耗，使最后剩余的热空穴参与水氧化反应），进一步促进载流子的分离和转移。结果表明，ZnInS/CuO/NiFeOOH/Ag光电极在相对于可逆氢电极（V）为1.23 V时，光电流密度显著增强至1.22 mA/cm²，比纯ZnInS高9.4倍。这项工作为在PEC水分解中高效设计光电极提供了一个有前景的概念。
