Alkaline water-splitting is a promising clean technology for hydrogen production. However, reducing the oxygen evolution reaction (OER) overpotential is critical to overall process efficiency and economic feasibility. To this end, we demonstrate novel 3D hierarchical α-Ni(OH)₂ nanoparticle decorated stainless steel nanoparticles (SSNP) catalyst deposits on Ni foam substrates. SSNP deposition along with simultaneous in-situ Ni(OH)₂ decoration of the SSNP is facilitated via a facile single-step electrophoretic deposition (EPD) based co-deposition method. The enhanced OER catalytic activity of α-Ni(OH)₂ owing to the synergetic SSNP support, which possibly serves as a dopant source to the metal hydroxide, could sustain current densities of 10 and 125 mA cm^-2 at overpotentials of 220 and 250 mV respectively, in 1 M KOH. These robust deposits could survive accelerated cycling and prolonged oxygen generation at higher current densities despite the lack of any polymeric binders. In 10 M KOH, current density of 500 mA cm^-2 could be maintained at an overpotential of 450 mV (iR-uncorrected).

中文翻译：

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不锈钢纳米粒子的原位装饰以协同增强α-Ni（OH）₂析氧反应的催化作用

碱性水分解是一种有前途的清洁制氢技术。但是，减少氧气析出反应（OER）的超电势对总体工艺效率和经济可行性至关重要。为此，我们展示了新型3D分层α-Ni（OH）₂纳米颗粒装饰的镍泡沫基底上的不锈钢纳米颗粒（SSNP）催化剂沉积物。SSNP沉积以及SSNP的同时原位Ni（OH）₂装饰是通过一种简便的基于单步电泳沉积（EPD）的共沉积方法来实现的。由于SSNP的协同作用，α-Ni（OH）_2的OER催化活性增强，它可能是金属氢氧化物的掺杂源，可以维持10和125 mA cm的电流密度^-2在1 M KOH中分别在220和250 mV的过电势下。尽管没有任何聚合物粘合剂，这些坚固的沉积物仍可以在较高的电流密度下经受住加速循环并延长氧气生成的过程。在10 M KOH中，可以将500 mA cm ^-2的电流密度保持在450 mV的过电势（ i R未校正）。