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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.
Zhang et al. (Tue,) studied this question.
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