Abstract
Single-atom catalysis is a powerful and attractive technique with exceptional performance, drastic cost reduction and notable catalytic activity and selectivity. In single-atom catalysis, supported single-atom catalysts contain isolated individual atoms dispersed on, and/or coordinated with, surface atoms of appropriate supports, which not only maximize the atomic efficiency of metals, but also provide an alternative strategy to tune the activity and selectivity of catalytic reactions. This review will highlight the attributes of single-atom catalysis and summarize the most recent advancements in single-atom catalysts with a focus on the design of highly active and stable single atoms. In addition, new research directions and future trends will also be discussed.Graphic
Highlights
Supported nanocatalysts have been widely studied due to high activities in different chemical reactions [1,2,3]
X-ray absorption fine structure (XAFS) analysis in this study revealed that the low-coordination and partially unoccupied 5d orbitals of the Pt atoms in the ALD50-Pt/graphene nanosheets (GNS) can contribute to enhanced performances as well
A combination of STEM with density functional theory (DFT) calculations conducted in this study revealed that the most favorable Pt adsorption sites were the vacancy sites of basal subsurface oxygen atoms located in the subsurface positions relative to the top surface bridging oxygen atoms
Summary
Supported nanocatalysts have been widely studied due to high activities in different chemical reactions [1,2,3]. Due to high costs and low natural abundances, noble metal catalysts cannot meet increasing demands and the minimization of the use of such expensive catalysts and the simultaneous retention in catalytic activity levels are significant and consistent challenges in this field [5, 6] (Scheme 1). To address these issues, the downsizing of noble metals from nanoclusters to isolated single atoms is the most. This review will be a useful guideline for industrial catalyst development
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