Binary Atomically Dispersed Metal‐Site Catalysts with Core−Shell Nanostructures for O 2 and CO 2 Reduction Reactions
Binary Atomically Dispersed Metal‐Site Catalysts with Core−Shell Nanostructures for O 2 and CO 2 Reduction Reactions
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DOI：
10.1002/smsc.202100046
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Xiaoxuan Yang;Maoyu Wang;M. Zachman;Hua Zhou;Yanghua He;Shengwen Liu;Hong‐Ying Zang;Zhenxing Feng-Zhenxing
中科院分区：
文献类型：
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作者：
Xiaoxuan Yang;Maoyu Wang;M. Zachman;Hua Zhou;Yanghua He;Shengwen Liu;Hong‐Ying Zang;Zhenxing Feng-Zhenxing
碳中原子分散和氮配位的单金属中心（M-N-C）是电催化领域中最有前途的无铂族金属（PGM）候选者。M-N-C催化剂中活性中心的独特电子结构和不饱和配位环境已被证明对氧还原反应（ORR）和CO2还原反应（CO2 RR）具有高活性和选择性。[10-15]然而，由于单中心的简单性和局限性，它无法解决和调节ORR的活性和稳定性之间的权衡。例如，高活性的单中心Fe催化剂通常迅速失活，特别是在初始阶段。以前的报告表明，活性部位脱金属、碳腐蚀和H2 O2侵蚀可能是降低催化剂稳定性的主要原因。含有两种不同的单金属位点的催化剂可以暴露增加的原子位点并产生协同效应，
Atomically dispersed and nitrogencoordinated single-metal sites in carbon (M–N–C) have emerged as the most promising platinum-group metal (PGM)-free candidates in the field of electrocatalysis. The unique electronic structure and unsaturated coordination environments of the active sites in M–N–C catalysts have been proven highly active and selective for the oxygen reduction reaction (ORR) and CO2 reduction reaction (CO2RR). [10–15] However, due to the simplicity and limitation of single-site centers, it is incompetent for addressing and regulating the trade-off between activity and stability toward the ORR. For example, highly active single-Fe-site catalysts often deactivate rapidly, especially at the initial stage. Previous reports have shown that active site demetallation, carbon corrosion, and H2O2 attack could be primarily responsible for mitigating catalyst stability. A catalyst containing two different single-metal sites could expose increased atomic sites and yield a synergistic effect,