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Structural Insights into Multi-Metal Spinel Oxide Nanoparticles for Boosting Oxygen Reduction Electrocatalysis

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Title
Structural Insights into Multi-Metal Spinel Oxide Nanoparticles for Boosting Oxygen Reduction Electrocatalysis
Author(s)
Jiheon Kim; Wonjae Ko; Ji Mun Yoo; Paidi, Vinod K.; Jang, Ho Yeon; Shepit, Michael; Jongmin Lee; Hogeun Chang; Hyeon Seok Lee; Jinwoung Jo; Byung Hyo Kim; Cho, Sung-Pyo; Lierop, Johan; Dokyoon Kim; Lee, Kug-Seung; Back, Seoin; Yung-Eun Sung; Taeghwan Hyeon
Publication Date
2022-02
Journal
ADVANCED MATERIALS, v.34, no.8
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Multi-metal oxide (MMO) materials have significant potential to facilitate various demanding reactions by providing additional degrees of freedom in catalyst design. However, a fundamental understanding of the (electro)catalytic activity of MMOs is limited because of the intrinsic complexity of their multi-element nature. Additional complexities arise when MMO catalysts have crystalline structures with two different metal site occupancies, such as the spinel structure, which makes it more challenging to investigate the origin of the (electro)catalytic activity of MMOs. Here, uniform-sized multi-metal spinel oxide nanoparticles composed of Mn, Co, and Fe as model MMO electrocatalysts are synthesized and the contributions of each element to the structural flexibility of the spinel oxides are systematically studied, which boosts the electrocatalytic oxygen reduction reaction (ORR) activity. Detailed crystal and electronic structure characterizations combined with electrochemical and computational studies reveal that the incorporation of Co not only increases the preferential octahedral site occupancy, but also modifies the electronic state of the ORR-active Mn site to enhance the intrinsic ORR activity. As a result, nanoparticles of the optimized catalyst, Co0.25Mn0.75Fe2.0-MMO, exhibit a half-wave potential of 0.904 V (versus RHE) and mass activity of 46.9 A g(oxide)(-1) (at 0.9 V versus RHE) with promising stability.
URI
https://pr.ibs.re.kr/handle/8788114/12059
DOI
10.1002/adma.202107868
ISSN
0935-9648
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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