双金属片
催化作用
表面改性
金属间化合物
材料科学
纳米材料基催化剂
合理设计
吸附
纳米技术
化学
光化学
无机化学
物理化学
有机化学
复合材料
合金
作者
Vera Giulimondi,Selina K. Kaiser,Antonio J. Martín,Simon Büchele,Frank Krumeich,Adam H. Clark,Javier Pérez‐Ramírez
出处
期刊:Small
[Wiley]
日期:2022-02-27
卷期号:18 (15)
被引量:11
标识
DOI:10.1002/smll.202200224
摘要
Abstract The introduction of a foreign metal atom in the coordination environment of single‐atom catalysts constitutes an exciting frontier of active‐site engineering, generating bimetallic low‐nuclearity catalysts often exhibiting unique catalytic synergies. To date, the exploration of their full scope is thwarted by (i) the lack of synthetic techniques with control over intermetallic coordination, and (ii) the challenging characterization of these materials. Herein, carbon‐host functionalization is presented as a strategy to selectively generate Au‐Ru dimers and isolated sites by simple incipient wetness impregnation, as corroborated by careful X‐ray absorption spectroscopy analysis. The distinct catalytic fingerprints are unveiled via the hydrogen evolution reaction, employed as a probe for proton adsorption properties. Intriguingly, the virtually inactive Au atoms enhance the reaction kinetics of their Ru counterparts already when spatially isolated, by shifting the proton adsorption free energy closer to neutrality. Remarkably, the effect is magnified by a factor of 2 in dimers. These results exemplify the relevance of controlling intermetallic coordination for the rational design of bimetallic low‐nuclearity catalysts.
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