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Facet-Defined Strain-Free Spinel Oxide for Oxygen Reduction

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Title
Facet-Defined Strain-Free Spinel Oxide for Oxygen Reduction
Author(s)
Jinwoung Jo; Ji Mun Yoo; Mok, Dong Hyeon; Jang, Ho Yeon; Jiheon Kim; Wonjae Ko; Kyungbeen Yeom; Megalamane S. Bootharaju; Back, Seoin; Yung-Eun Sung; Taeghwan Hyeon
Publication Date
2022-05
Journal
Nano Letters, v.22, no.9, pp.3636 - 3644
Publisher
American Chemical Society
Abstract
© 2022 American Chemical Society.Exposing facet and surface strain are critical factors affecting catalytic performance but unraveling the composition-dependent activity on specific facets under strain-controlled environment is still challenging due to the synthetic difficulties. Herein, we achieved a (001) facet-defined Co-Mn spinel oxide surface with different surface compositions using epitaxial growth on Co3O4 nanocube template. We adopted composition gradient synthesis to relieve the strain layer by layer, minimizing the surface strain effect on catalytic activity. In this system, experimental and calculational analyses of model oxygen reduction reaction (ORR) activity reveals a volcano-like trend with Mn/Co ratios because of an adequate charge transfer from octahedral-Mn to neighboring Co. Co0.5Mn0.5 as an optimized Mn/Co ratio exhibits both outstanding ORR activity (0.894 V vs RHE in 1 M KOH) and stability (2% activity loss against chronoamperometry). By controlling facet and strain, this study provides a well-defined platform for investigating composition-structure-activity relationships in electrocatalytic processes.
URI
https://pr.ibs.re.kr/handle/8788114/11951
DOI
10.1021/acs.nanolett.2c00238
ISSN
1530-6984
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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