X射线光电子能谱
材料科学
氧气
金属
分解水
表面等离子共振
化学工程
光催化
蚀刻(微加工)
铜
纳米颗粒
催化作用
纳米技术
化学
冶金
图层(电子)
有机化学
工程类
生物化学
作者
Junqi Li,Zheng Liang,Yi Qin,Liejin Guo,Nan Lei,Qianqian Song
标识
DOI:10.1002/ente.201800280
摘要
Abstract Defective Bi 2 WO 6 ‐supported Cu nanoparticles photoelectrocatalyst were successfully synthesized via an etching approach by using NaBH 4 as reducing agent. The as‐prepared Cu/Bi 2 WO 6 ‐1 was dominated by CuO and Cu and Cu/Bi 2 WO 6 ‐2 was dominated by metallic Cu, confirmed by XPS and TEM analyses. These etching pretreatments also induced the formation of defect sites such as oxygen vacancies and W 5+ . The presence of oxygen vacancies could significantly increase the photogenerated electrons capture abilities. Metallic Cu nanocrystals on the surface of Bi 2 WO 6 photoanodes are beneficial for the photoresponse range as well as the separation and consumption of photogenerated carriers due to the surface plasmon resonance effect of Cu. Photoelectrochemical studies demonstrated that Cu/Bi 2 WO 6 ‐x exhibited a markedly improved PEC performance in water splitting reaction as compared to that of Bi 2 WO 6 which mainly because of the light harvesting efficiency (η abs ) and the interfacial charge transfer efficiency. Importantly, Cu/Bi 2 WO 6 ‐2 exhibited the best PEC activity with a high current density and good stability under neutral conditions, which may be ascribed to the defective Bi 2 WO 6 structure in combination with surface ligand engineering and the synergistic effect of oxygen vacancies and metallic Cu. In addition, the function mechanism of CuO, metallic Cu and oxygen vacancies were discussed in details.
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