1. Low-coordinated surface nickel oxide as electrocatalyst for efficient water oxidation.
- Author
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Zhang, Jiayun, Su, Bing-Jian, Wu, Kuang-Hsu, Xia, Qingbing, Knibbe, Ruth, and Gentle, Ian
- Subjects
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NICKEL oxide , *OXIDATION of water , *OXYGEN evolution reactions , *CATALYTIC activity , *NICKEL oxides , *ELECTROCATALYSTS - Abstract
[Display omitted] • A new oxygen vacancy-rich B-Ni/CP is fabricated via a simple electrodeposition method. • The Ni2+ center has a low oxygen coordination with a pyramidal symmetry. • The B-Ni/CP exhibits high electrocatalytic activity for OER. Ni-based compounds represent promising candidates as high-performance electrocatalysts for the oxygen evolution reaction (OER) in alkaline media. Here, a new Ni oxide electrocatalyst developed via a simple electrodeposition method is reported, exhibiting enhanced catalytic activity for OER. Structural and activity analysis of the fresh and post-reaction samples reveals that the Ni2+ center has low coordination with pyramidal symmetry (NiO 5). The bulk metallic Ni readily undergoes oxidation under OER conditions to generate more low-coordinated Ni2+ and high-valence state Ni (Ni3+) species, thereby facilitating the OER reaction. This study provides new insight into the active structure of Ni-based oxide electrocatalysts and offers a simple pathway for the design and development of cost-effective and high-performance electrocatalysts for applications in OER. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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