To develop hydrogen energy production and address the issues of global warming, inexpensive, effective, and long-lasting transition metal-based electrocatalysts for the synthesis of hydrogen are crucial. Herein, a porous electrocatalyst NiMo/Ni/NF was successfully constructed by a two-step electrodeposition process, and was used in the hydrogen evolution reaction (HER) of electrocatalytic water decomposition. NiMo nanoparticles were coated on porous Ni/NF grown on nickel foam (NF), leading to a resilient porous structure with enhanced conductivity for efficient charge transfer, as well as distinctive three-dimensional channels for quick electrolyte diffusion and gas release. Notably, the low overpotential (42 mV) and fast kinetics (Tafel slope of 44 mV dec⁻¹) at a current density of 10 mA cm⁻² in 1.0 M KOH solution demonstrate the excellent HER activity of the electrode, which was superior to that of recently reported non-noble metal-based catalysts. Additionally, NiMo/Ni/NF showed extraordinary catalytic durability in stability tests at a current density of 10 mA cm⁻² for 70 h. The porous structure catalyst and the electrodeposition–electrocatalysis technique examined in this study offer new approaches for the advancement of the electrocatalysis field because of these benefits.

中文翻译：

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一种自支撑多孔 NiMo 电催化剂，可提高析氢反应的催化活性

为了发展氢能生产并解决全球变暖问题，廉价、有效且持久的过渡金属基氢合成电催化剂至关重要。在此，通过两步电沉积工艺成功构建了多孔电催化剂NiMo/Ni/NF，并将其用于电催化水分解的析氢反应（HER）。 NiMo 纳米颗粒涂覆在泡沫镍 (NF) 上生长的多孔 Ni/NF 上，形成弹性多孔结构，具有增强的电导率，可实现有效的电荷转移，以及独特的三维通道，可实现电解质的快速扩散和气体释放。值得注意的是，在1.0 M KOH溶液中电流密度为10 mA cm ^-2时，低过电势（42 mV）和快速动力学（塔菲尔斜率44 mV dec ^-1 ）证明了该电极优异的HER活性，优于最近报道的非贵金属基催化剂。此外，NiMo/Ni/NF在电流密度为10 mA cm ^-2 70小时的稳定性测试中表现出非凡的催化耐久性。由于这些优点，本研究中研究的多孔结构催化剂和电沉积电催化技术为电催化领域的发展提供了新的途径。