The development of earth-abundant and low-cost electrocatalysts with high performance toward the oxygen evolution reaction (OER) plays a key role in water splitting. Here, a novel OER electrocatalyst of Ni–Fe–OH/Ni₃S₂ nanoparticles on Ni foam (Ni–Fe–OH/Ni₃S₂/NF) was synthesized by a facile, ultrafast two-step method within 2 minutes. The obtained Ni–Fe–OH/Ni₃S₂/NF catalyst presents an excellent OER performance, only requiring a low overpotential of 268 mV to reach a current density of 10 mA cm⁻² and a small Tafel slope of 54 mV dec⁻¹ in 1 M KOH, which was sustained for 12 h at a current density of 175 mA cm⁻² almost without any degradation. The superior OER performance of the Ni–Fe–OH/Ni₃S₂/NF catalyst is attributed to the increased active sites, the accelerated electron transfer between the electrode and electrolyte, and the synergistic effect between amorphous Ni–Fe–OH and Ni₃S₂. This work opens up a new avenue for preparing highly efficient heterostructure electrocatalysts toward the OER.

中文翻译：

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硫化镍纳米粒子上的无定形镍铁氢氧化物膜用于氧释放反应

富氧，低成本的高性能地球化学催化剂对氧气释放反应（OER）的开发在水分解中起着关键作用。在这里，通过简便，超快的两步法在2分钟内合成了Ni-Fe-OH / Ni ₃ S ₂纳米粒子在泡沫镍上的新型OER电催化剂（Ni-Fe-OH / Ni ₃ S ₂ / NF）。将所获得的Ni-Fe基OH /镍₃小号₂ / NF催化剂呈现优异的性能OER，仅需要低的超电势268毫伏达到10毫安cm 2的电流密度^-2和54毫伏分解的小塔菲尔斜率^{- 1合}1 M KOH，在175 mA cm ^-2的电流密度下可持续12 h几乎没有任何降解。Ni-Fe-OH / Ni ₃ S ₂ / NF催化剂的优异的OER性能归因于活性位点的增加，电极与电解质之间加速的电子转移以及非晶态Ni-Fe-OH与Ni的协同作用₃ š ₂。这项工作为制备面向OER的高效异质结构电催化剂开辟了一条新途径。