Quenching-induced atom-stepped bimetallic sulfide heterointerface catalysts for industrial hydrogen generation
Source abstract
Abstract
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-Ni 3 S 2 /Co 3 S 4 ) 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 Ni 3 S 2 to Co 3 S 4 via Ni–S–Co interfacial bridging, which effectively accelerates water activation and optimizes hydrogen adsorption and desorption . An AEM electrolyzer using an AS-Ni 3 S 2 /Co 3 S 4 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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Catalysis and Hydrodesulfurization Studies · Catalytic Processes in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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