Surface Electronic Structure Modulation of Cobalt Nitride Nanowire Arrays via Selenium Deposition for Efficient Hydrogen Evolution
Surface Electronic Structure Modulation of Cobalt Nitride Nanowire Arrays via Selenium Deposition for Efficient Hydrogen Evolution
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通过硒沉积调节氮化钴纳米线阵列的表面电子结构以实现高效析氢
DOI：
10.1002/adfm.202109792
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发表时间：
2021-11
影响因子：
19
通讯作者：
Xie Yi
中科院分区：
文献类型：
--
作者：
Sun Yiqiang;Mao Keke;Shen Qi;Zhao Lei;Shi Chuanxin;Li Xiuling;Gao Yanan;Li Cuncheng;Xu Kun;Xie Yi
通过将非金属杂原子引入到主体材料的晶格中来调节电催化剂的表面电子结构以提高其电催化性能是一种常见的方法。然而，杂原子的引入将不可避免地引发晶格应变和空位，这可能导致主体材料的结构发生较大变化。在这种情况下，掺杂催化剂在苛刻的碱性介质中的催化过程中容易发生重构，这阻碍了对催化剂结构与活性关系以及催化性能的理解。在此，以氮化钴为例，揭示了低温硒升华策略可以有效地优化Co 4 N纳米线阵列中的表面电子结构，而不会显著改变体相结构。优化后的Se/Co 4 N纳米线阵列在碱性介质中具有较好的析氢催化活性和相结构稳定性，其催化活性提高了6.5倍。这些发现可能为设计用于能源相关应用的稳定结构催化剂提供新的概念。
Nonmetal heteroatom incorporation into the lattice of host materials is a common way to regulate the surface electronic structure of electrocatalysts to boost their electrocatalytic performance. However, the heteroatom incorporation will inevitably trigger lattice strain and vacancy, which may lead to large changes in the structure of host materials. In this situation, the reconstruction of doped catalysts easily occurs during the catalytic process under harsh alkaline media, which hinders understanding the structure–activity correlation between catalysts and catalytic performance. Herein, taking cobalt nitride as an example, it is promulgated that a low‐temperature selenium sublimation strategy can effectively optimize the surface electronic structure in Co4N nanowire arrays with no significant change of bulk phase structure. Benefiting from surface selenium modification, the optimized SeCo4N nanowire arrays exhibit a 6.5 times enhancement of catalytic activity with structural phase stability for hydrogen evolution reaction in basic media. These findings may provide a new concept to design stable structured catalysts for energy‐related applications.
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