It is of great importance to design and exploit high-efficiency low-cost electrocatalysts for the oxygen evolution reaction (OER) under mild conditions for applications. In this Article, we propose that formation of a thin amorphous Ni carbonate layer on Ni₃N nanoarray supported on carbon cloth (Ni₃N NA/CC) is an effective strategy to boost its OER activity in at near-neutral pH. When used as a 3D non-noble-metal OER electrocatalyst, the resulting core–shell Ni₃[email protected] NA/CC displays superior catalytic activity with extremely small overpotential of 400 mV for 20 mA cm⁻² in 1.0 M KHCO₃ (bulk pH: 8.3). Moreover, it also exhibits considerable long-term electrochemical durability with its activity being preserved for at least 12 h. Conductive Ni₃N nanoarray not only provides as the Ni source for in-situ electrochemical derivation of 3D Ni-Ci catalyst with high surface area, more exposed active sites and facilitated mass diffusion, but effectively prompts the electron transport from Ni-Ci shell to CC, enabling more efficient water oxidation electrocatalysis.

在温和的条件下设计和开发高效的低成本电催化剂用于氧释放反应（OER）至关重要。在本文中，我们建议在碳布（Ni ₃ N NA / CC）上支撑的Ni ₃ N纳米阵列上形成非晶态的碳酸镍薄层是提高其在接近中性pH值下的OER活性的有效策略。当用作3D非贵金属OER电催化剂时，所得的核壳型Ni ₃ [受电子邮件保护] NA / CC表现出优异的催化活性，在1.0 M KHCO _3中对20 mA cm ^-2具有400 mV的极小的超电势（大量pH：8.3）。此外，它还表现出相当高的长期电化学耐久性，其活性可以保留至少12小时。导电Ni ₃ N纳米阵列不仅可作为Ni源用于原位电化学衍生具有高表面积，更多暴露的活性位点和促进质量扩散的3D Ni-Ci催化剂，而且有效地促进了电子从Ni-Ci壳层向金属的迁移。 CC，可实现更高效的水氧化电催化。