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- Title
Redox‐Inert Fe<sup>3+</sup> Ions in Octahedral Sites of Co‐Fe Spinel Oxides with Enhanced Oxygen Catalytic Activity for Rechargeable Zinc–Air Batteries.
- Authors
Wang, Xiao‐Tong; Ouyang, Ting; Wang, Ling; Zhong, Jia‐Huan; Ma, Tianyi; Liu, Zhao‐Qing
- Abstract
Bimetallic cobalt‐based spinel is sparking much interest, most notably for its excellent bifunctional performance. However, the effect of Fe3+ doping in Co3O4 spinel remains poorly understood, mainly because the surface state of a catalyst is difficult to characterize. Herein, a bifunctional oxygen electrode composed of spinel Co2FeO4/(Co0.72Fe0.28)Td(Co1.28Fe0.72)OctO4 nanoparticles grown on N‐doped carbon nanotubes (NCNTs) is designed, which exhibits superior performance to state‐of‐the‐art noble metal catalysts. Theoretical calculations and magnetic measurements reveal that the introduction of Fe3+ ions into the Co3O4 network causes delocalization of the Co 3d electrons and spin‐state transition. Fe3+ ions can effectively activate adjacent Co3+ ions under the action of both spin and charge effect, resulting in the enhanced intrinsic oxygen catalytic activity of the hybrid spinel Co2FeO4. This work provides not only a promising bifunctional electrode for zinc–air batteries, but also offers a new insight to understand the Co‐Fe spinel oxides for oxygen electrocatalysis.
- Subjects
CATALYTIC activity; SPINEL; STORAGE batteries; OXYGEN electrodes; ELECTROCATALYSIS; IONS; ZINC electrodes
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 38, p13425
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201907595