Function-oriented design of robust metal cocatalyst for photocatalytic hydrogen evolution on metal/titania composites.
Function-oriented design of robust metal cocatalyst for photocatalytic hydrogen evolution on metal/titania composites.
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用于金属/二氧化钛复合材料光催化析氢的稳健金属助催化剂的功能导向设计
DOI:
10.1038/s41467-020-20464-x
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发表时间:
2021-01-08
影响因子:
16.6
通讯作者:
Gong XQ
中科院分区:
文献类型:
--
作者:
Wang D;Gong XQ
While the precise design of catalysts is one of ultimate goals in catalysis, practical strategies often fall short, especially for complicated photocatalytic processes. Here, taking the hydrogen evolution reaction (HER) as an example, we introduce a theoretical approach for designing robust metal cocatalysts supported on TiO2using density functional theory calculations adopting on-site Coulomb correction and/or hybrid functionals. The approach starts with clarifying the individual function of each metal layer of metal/TiO2composites in photocatalytic HER, covering both the electron transfer and surface catalysis aspects, followed by conducting a function-oriented optimization via exploring competent candidates. With this approach, we successfully determine and verify bimetallic Pt/Rh/TiO2and Pt/Cu/TiO2catalysts to be robust substitutes for conventional Pt/TiO2. The right metal type as well as the proper stacking sequence are demonstrated to be key to boosting performance. Moreover, we tentatively identify the tunneling barrier height as an effective descriptor for the important electron transfer process in photocatalysis on metal/oxide catalysts. We believe that this study pushes forward the frontier of photocatalyst design towards higher water splitting efficiency.
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