Molybdenum-Based Co-catalysts in Photocatalytic Hydrogen Production: Categories, Structures, and Roles.
Molybdenum-Based Co-catalysts in Photocatalytic Hydrogen Production: Categories, Structures, and Roles.
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DOI：
10.1002/cssc.201801481
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发表时间：
2018-10
期刊：
影响因子：
8.4
通讯作者：
B. Ma;Dekang Li;Xiaoyan Wang;Keying Lin
中科院分区：
文献类型：
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作者：
B. Ma;Dekang Li;Xiaoyan Wang;Keying Lin
利用太阳能进行光催化制氢已经引起了世界各国的极大兴趣。主要的挑战是光催化剂的高成本和光催化制氢的低效率。助催化剂作为光催化剂的重要组成部分，通常用于激发光激发电子从光吸收体向表面的转移，并催化水溶液中的质子还原反应生成H2。然而，大多数用于光催化制氢的助催化剂是贵金属，其昂贵并且与工业所要求的低成本相矛盾。因此，开发地球资源丰富且廉价的助催化剂来替代贵金属是光催化制氢的必要条件。本文重点介绍了铼基非贵金属助催化剂在光催化制氢中的性能和作用。我们开发了一系列廉价而有效的钯基助催化剂。结果表明，在相同的光催化条件下，采用共沉淀法将Mo基共催化剂负载到CdS上，比传统的Pt/CdS催化剂产生更多的H2。该助催化剂能够形成异质结，作为桥梁，以促进光生电荷的传输和分离;此外，由于其大的比电容，该助催化剂能够接受和存储光激发电子。储存的光电子然后可以根据质子还原过程释放以形成H2。研究发现，铼基助催化剂具有亚稳态结构和多价态，提供了更多的活性中心，有效地催化H2的生成，抑制了逆反应的发生。具有上级性能的钼基助催化剂的发现将为新型助催化剂的设计提供指导。
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 H2 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 H2 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 H2 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 H2 . 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 H2 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.