Under the background of “Green hydrogen,” the method of hydrogen production through coupling water electrolysis with renewable energy has raised heightened demands for fundamental hydrogen evolution catalysts. Recently, CoP-based catalysts have attracted much attention due to their excellent HER activity. However, the self-reconfiguration behavior of CoP in actual operation seriously affects its long-term hydrogen evolution stability. Herein, an in-situ reconstructed Fe sacrificial protective layer is proposed to inhibit the complete conversion of CoP in alkaline HER process and improve the stability of CoP-based catalysts. Through this sacrificial strategy, nearly 80 % of CoP is retained, forming a new Co(OH)/COP as the active interface of HER. As result, the catalyst can maintain hydrogen evolution at high current density for more than 10 days, and show excellent dynamic response in start-stop experiment. In an Anionic Exchange Membrane electrode cell, a fully hydrolyzed water AEM cell needs only 1.9 V to drive 1 A cm current density.

中文翻译：

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Fe牺牲保护层的重建使得高效CoP催化剂能够在高电流密度下进行析氢反应

在“绿氢”背景下，水电解与可再生能源耦合制氢的方法对基础析氢催化剂提出了更高的要求。近年来，CoP基催化剂因其优异的HER活性而备受关注。然而，CoP在实际运行中的自重构行为严重影响其长期析氢稳定性。在此，提出了一种原位重构的Fe牺牲保护层来抑制碱性HER过程中CoP的完全转化并提高CoP基催化剂的稳定性。通过这种牺牲策略，近80%的CoP被保留，形成新的Co(OH)/COP作为HER的活性界面。结果表明，该催化剂能够在高电流密度下保持析氢10天以上，并在启停实验中表现出优异的动态响应。在阴离子交换膜电极电池中，完全水解的水 AEM 电池只需 1.9 V 即可驱动 1 A cm 的电流密度。