Nickel oxides and (oxy)hydroxides are promising replacements for noble-metal-based catalysts owing to their high activity and good long-term stability for the oxygen evolution reaction (OER). Herein, we developed nanoporous Ni by a method of combined rapid solidification and chemical dealloying. Subsequently, nanoporous NiO was obtained via heating treatment, the macropore and skeleton sizes of the NiO originated from Ni₁₀Al₉₀ alloy are 100–300 nm and 80–200 nm, respectively. Benefiting from the multi-stage nanoporous structure and high specific surface area, the nanoporous NiO demonstrates an outstanding OER, reaching 20 mA cm⁻² at an overpotential of 356 mV in 1 M KOH. The corresponding Tafel slope and apparent activation energy are measured to be 76.73 mV dec⁻¹ and 29.0 kJ mol⁻¹, respectively. Moreover, kinetic analysis indicates that the NiO catalyst shows pseudocapacitive characteristics, and the improved current is attributed to the high-rate pseudocapacitive behavior that efficiently maintains increased nickel redox cycling to accelerate the reaction rates. After 1000 cycles of voltammetry, the overpotential of the NiO decreases by 22 mV (j = 10 mA cm⁻²), exhibiting excellent stability and durability.

氧化镍和（羟基）氢氧化物因其高活性和对放氧反应（OER）的良好长期稳定性而有望替代贵金属基催化剂。本文中，我们通过快速凝固和化学脱合金相结合的方法开发了纳米多孔镍。随后，通过热处理获得了纳米多孔NiO，源自Ni ₁₀ Al ₉₀合金的NiO的大孔和骨架尺寸分别为100-300 nm和80-200 nm。得益于多级纳米多孔结构和高比表面积，纳米多孔NiO表现出出色的OER，达到20 mA cm ^-2在1 M KOH中的356 mV的超电势。相应的塔菲尔斜率和表观活化能经测量分别为76.73 mV dec ^-1和29.0 kJ mol ^-1。此外，动力学分析表明，NiO催化剂表现出拟电容特性，而改善的电流归因于高速率拟电容行为，该行为有效地维持了镍氧化还原循环的增加，从而加快了反应速率。在1000次伏安循环后，NiO的过电势降低了22 mV（j  = 10 mA cm ^-2），表现出出色的稳定性和耐久性。