- Title
- Redox-inert Fe³⁺ ions in octahedral sites of Co-Fe spinel oxides with enhanced oxygen catalytic activity for rechargeable zinc-air batteries
- Creator
- Wang, Xiao-Tong; Ouyang, Ting; Wang, Ling; Zhong, Jia-Huan; Ma, Tianyi; Liu, Zhao-Qing
- Relation
- Angewandte Chemie Vol. 58, Issue 38, p. 13291-13296
- Publisher Link
- http://dx.doi.org/10.1002/anie.201907595
- Publisher
- Wiley - V C H Verlag GmbH
- Resource Type
- journal article
- Date
- 2019
- Description
- 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.
- Subject
- colbalt ferrite; oxygen evolution reaction; oxygen reduction reaction; spinel phases; zinc-air batteries
- Identifier
- http://hdl.handle.net/1959.13/1416885
- Identifier
- uon:37134
- Identifier
- ISSN:1433-7851
- Rights
- This is the peer reviewed version of above article, which has been published in final form at https://doi.org/10.1002/anie.201907595. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
- Language
- eng
- Full Text
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