Fine-tuning the coordination number of single-atom W has been achieved by anchoring single-atom incorporated onto Graphite carbon nitride (g-CN) frameworks, which has been found to be essential for efficient photocatalytic CO reduction. The WN sample, with a moderate coordination number of 4 for W atoms, exhibits the highest photocatalytic activity toward CO yield at 2.67 μmol hg, several times larger than the W sites with other coordination numbers such as 3 and 5. The coordination microenvironment of central W sites is found to be crucial for CO chemisorption and efficient charge-carrier separation/transport during photocatalytic reactions. These results suggest that the coordination microenvironment of single atoms plays a significant role in photocatalytic reactions, providing insights into the design of single atoms catalysts suitable for photocatalytic applications.

中文翻译：

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定制单原子W的配位微环境以实现高效光催化CO2还原

通过将单原子锚定到石墨氮化碳（g-CN）框架上，可以微调单原子 W 的配位数，这对于有效光催化 CO 还原至关重要。 WN样品的W原子配位数为4，在2.67 μmol hg下表现出最高的CO产率光催化活性，比其他配位数（例如3和5）的W位点大几倍。中心的配位微环境研究发现，W 位点对于光催化反应过程中 CO 化学吸附和有效载流子分离/传输至关重要。这些结果表明单原子的配位微环境在光催化反应中发挥着重要作用，为适合光催化应用的单原子催化剂的设计提供了见解。