Photoinduced self-stability mechanism of CdS photocatalyst: The dependence of photocorrosion and H2-evolution performance

光催化 材料科学 金属 化学工程 乳酸 纳米颗粒 表面状态 微观结构 纳米技术 光化学 结晶学 曲面(拓扑) 冶金 催化作用 化学 细菌 有机化学 工程类 几何学 数学 生物 遗传学
作者
Yuxiao Chen,Wei Zhong,Feng Chen,Ping Wang,Jiajie Fan,Huogen Yu
出处
期刊:Journal of Materials Science & Technology [Elsevier BV]
卷期号:121: 19-27 被引量:130
标识
DOI:10.1016/j.jmst.2021.12.051
摘要

• The lattice Cd 2+ reduction during CdS photocorrosion was carefully investigated. • The isolated Cd nanoparticles were produced on CdS surface in Na 2 S-Na 2 SO 3 system. • A metallic Cd layer is uniformly coated on CdS surface in the lactic acid system. • A photoinduced self-stability mechanism of CdS photocatalyst has been proposed. CdS photocorrosion is one of the most important factors that greatly affect the photocatalytic H 2 -production rate and long-time stability. However, the reported works about CdS photocorrosion are mainly focused on the surface oxidation by photogenerated holes, while the possible reduction of lattice Cd 2+ by photogenerated electrons is usually ignored. In this work, the lattice Cd 2+ reduction by photogenerated electrons during CdS photocorrosion were carefully investigated to reveal its potential effect on the microstructure change and photocatalytic H 2 -production performance of CdS photocatalyst based on the two typical Na 2 S-Na 2 SO 3 and lactic acid H 2 -evolution systems. It was found that many isolated metallic Cd nanoparticles (5–50 nm) were produced on the CdS surface in the Na 2 S-Na 2 SO 3 system, causing its serious destroy of CdS surface and a gradually decreased photocatalytic activity, while only a metallic Cd layer (2-3 nm) is homogeneously coated on the CdS surface in the lactic acid system, leading to an increased H 2 -evolution rate. In fact, once a certain amount of metallic Cd was produced on the CdS surface, the resulting CdS-Cd composites can present a stable photocatalytic H 2 -production activity and excellent stability for the final CdS-Cd photocatalysts. Hence, a photoinduced self-stability mechanism of CdS photocatalyst has been proposed, namely, the spontaneously produced metallic Cd contributes to the transformation of unstable CdS into stable CdS-Cd structure, with the simultaneous realization of final stable H 2 -evolution performance.
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