Interfacial Sites between Cobalt Nitride and Cobalt Act as Bifunctional Catalysts for Hydrogen Electrochemistry
Interfacial Sites between Cobalt Nitride and Cobalt Act as Bifunctional Catalysts for Hydrogen Electrochemistry
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DOI：
10.1021/acsenergylett.9b00738
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发表时间：
2019-06
影响因子：
22
通讯作者：
Fu-zhan Song;Wei Li;Jiaqi Yang;Guanqun Han;Tao Yan;Xi Liu;Y. Rao;Peilin Liao;Z. Cao;Yujie Sun
中科院分区：
文献类型：
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作者：
Fu-zhan Song;Wei Li;Jiaqi Yang;Guanqun Han;Tao Yan;Xi Liu;Y. Rao;Peilin Liao;Z. Cao;Yujie Sun
氢（H2）电化学主要由两个反应组成：水中产生H2的析氢反应（HER）和氢燃料电池中利用H2的氢氧化反应（HOR）。未来氢经济的实现需要开发低成本且高效的 HER 和 HOR 电催化剂。在此，我们报告集电器上钴纳米粒子的部分氮化导致丰富的 Co2N/Co 界面位点，其表现出氢电化学的双功能活性，可与在类似条件下测试的最先进的 Pt 对应物相媲美。我们结合实验和理论计算结果表明，Co2N/Co界面位点不仅具有最佳的氢吸附能，而且有利于催化剂表面的水吸附和解离，所有这些都有利于HER和HOR的电催化性能。此外，我们的 Co2N/Co 电催化剂还表现出出色的耐受性...
Hydrogen (H2) electrochemistry primarily consists of two reactions: hydrogen evolution reaction in water for H2 production (HER) and hydrogen oxidation reaction in hydrogen fuel cells for H2 utilization (HOR). The realization of future hydrogen economy necessitates the development of low-cost and competent electrocatalysts for both HER and HOR. Herein, we report that partial nitridation of cobalt nanoparticles on current collectors results in rich Co2N/Co interfacial sites, which exhibit bifunctional activity for hydrogen electrochemistry, rivaling the state-of-the-art Pt counterparts tested under similar conditions. Our combined experimental and theoretical computation results demonstrate that Co2N/Co interfacial sites not only possess optimal hydrogen adsorption energy but also facilitate water adsorption and dissociation on the catalyst surface, all of which are beneficial to the electrocatalytic performance for both HER and HOR. In addition, our Co2N/Co electrocatalysts also demonstrate great toleranc...