光催化
催化作用
制氢
钼
贵金属
材料科学
氢
太阳能燃料
化学工程
无机化学
化学
生物化学
工程类
有机化学
作者
Baojun Ma,Dekang Li,Xiaoyan Wang,Kuen‐Song Lin
出处
期刊:Chemsuschem
[Wiley]
日期:2018-10-22
卷期号:11 (22): 3871-3881
被引量:33
标识
DOI:10.1002/cssc.201801481
摘要
Abstract Photocatalytic hydrogen production by using solar energy has attracted great interest around the world. The main challenges are the high costs of the photocatalysts and the low efficiency of photocatalytic hydrogen production. Co‐catalysts, as crucial components of photocatalysts, are usually used to stimulate photoexcited electron transfer from the light absorber to the surface, and they also catalyze the proton‐reduction reaction to form H 2 in water. However, most co‐catalysts used in photocatalytic hydrogen production are noble metals, which are expensive and contradict the low‐costs demanded by industry. Therefore, the development of earth‐abundant and cheap co‐catalysts to replace noble metals is necessary for photocatalytic H 2 production. This account highlights the performance and roles of molybdenum‐based non‐noble metal co‐catalysts in photocatalytic hydrogen production. We developed a series of inexpensive and efficient molybdenum‐based co‐catalysts. We demonstrated that more H 2 could be produced by loading Mo‐based co‐catalysts on CdS by using the co‐precipitation method than by using traditional Pt/CdS same under the same photocatalytic conditions. The molybdenum‐based co‐catalysts were able to form heterojunctions, which served as bridges to facilitate the transport and separation of photogenerated charges; moreover, the molybdenum‐based co‐catalysts were able to accept and store photoexcited electrons owing to their large specific capacitance. The stored photoelectrons could then be released according to proton‐reduction processes to form H 2 . Furthermore, the molybdenum‐based co‐catalysts were found to have metastable state structures and multiple valence states, which provided more active sites and effectively catalyzed the production of H 2 and inhibited the reverse reaction. The discovery of Mo‐based co‐catalysts with superior properties will provide guidance for the design of new co‐catalysts.
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