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Ni3[email protected] nanoarray as a highly active and durable non-noble-metal electrocatalyst for water oxidation at near-neutral pH
Journal of Catalysis ( IF 6.5 ) Pub Date : 2017-11-06 , DOI: 10.1016/j.jcat.2017.10.013
Fengyu Xie , Huali Wu , Jirong Mou , Dunmin Lin , Chenggang Xu , Cong Wu , Xuping Sun

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.



中文翻译:

Ni 3 [受电子邮件保护]纳米阵列,是一种高活性和耐用的非贵金属电催化剂,可在接近中性pH的条件下进行水氧化

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。

更新日期:2017-11-06
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