Owing to their distinctive chemical properties and cost-effectiveness, transition metal oxides (TMOs) promise intriguing potential in electrocatalysis applications. Herein, porous NiCo₂O₄ nanobelts with controlled oxygen deficiencies were synthesized based on a facile strategy of hydrothermal growth followed by annealing under an inert atmosphere. By finely adjusting annealing temperature and time, concentrations of oxygen deficiencies within the nanobelts could be modulated. The oxygen-deficient NiCo₂O₄ nanobelts exhibit superior oxygen evolution reaction (OER) performance at a relatively low overpotential which is superior to the values of prepared pristine NiCo₂O₄ electrocatalysts. In particular, they show excellent stability for 10 h at 10 mA cm⁻². The enhanced OER activity and stability of the catalyst can be ascribed to the abundant oxygen deficiencies as well as porous architecture of the anisotropic nanobelts. This work paves a promising way in fabricating advanced electrocatalysts.

中文翻译：

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多孔缺氧NiCo2O4纳米带的受控生长，作为氧气析出反应的高效电催化剂

由于其独特的化学特性和成本效益，过渡金属氧化物（TMO）有望在电催化应用中产生巨大的潜力。在此，基于水热生长然后在惰性气氛下退火的简便策略，合成了具有受控氧缺陷的多孔NiCo ₂ O ₄纳米带。通过精细调节退火温度和时间，可以调节纳米带内缺氧的浓度。缺氧的NiCo ₂ O ₄纳米带在相对较低的超电势下表现出优异的析氧反应（OER）性能，其优于制备的原始NiCo ₂ O _4的值电催化剂。尤其是，它们在10 mA cm ^-2下显示10个小时的出色稳定性。增强的OER活性和催化剂的稳定性可以归因于各向异性纳米带的大量缺氧以及多孔结构。这项工作为制造高级电催化剂铺平了一条有希望的途径。