Hua Zhang , Nianpeng Li , Sanshuang Gao , Anran Chen , Qihang Qian , Qingquan Kong , Bao Yu Xia , Guangzhi Hu
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引用次数: 0
摘要
开发在安培电流密度下具有高活性和耐久性的非贵金属析氢反应（HER）电催化剂对于新兴的阴离子交换膜（AEM）电解至关重要，但仍具有挑战性。在这里，我们提出了一种原子梯级镍钴双金属硫化物（AS-Ni3S2/Co3S4）异质结构，具有优异的HER性能，在电流密度为10和2000 mA cm−2时，其过电位分别为28和195 mV。实验分析和理论计算表明，功函数诱导的界面内置电场驱动电子通过Ni-S-Co界面桥接从Ni3S2转移到Co3S4，有效地加速了水的活化，优化了氢的吸附和解吸。采用as - ni3s2 /Co3S4异质结构作为阴极的AEM电解槽，电池电压仅为1.71 V和1.79 V，分别达到1.0和2.0 A cm−2，并稳定运行1200 h而不降低活性。
Quenching-induced atom-stepped bimetallic sulfide heterointerface catalysts for industrial hydrogen generation
Developing non-noble metal hydrogen evolution reaction (HER) electrocatalysts with high activity and durability at ampere-level current densities is vital for emerging anion exchange membrane (AEM) water electrolysis, but it remains challenging. Here we present an atom-stepped nickel–cobalt bimetallic sulfide (AS-Ni3S2/Co3S4) heterostructure that exhibits superior HER performance, with ultra-low overpotentials of 28 and 195 mV at current densities of 10 and 2000 mA cm−2, respectively. Experimental analyses and theoretical calculations revealed that the work-function-induced interfacial built-in electric field drives electron transfer from Ni3S2 to Co3S4 via Ni–S–Co interfacial bridging, which effectively accelerates water activation and optimizes hydrogen adsorption and desorption. An AEM electrolyzer using an AS-Ni3S2/Co3S4 heterostructure as the cathode required cell voltages of only 1.71 and 1.79 V to reach 1.0 and 2.0 A cm−2, respectively, and operated stably for 1200 h without activity degradation.
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