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Baek, Kangkyun
복잡계 자기조립 연구단
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Crystal Phase Transition Creates a Highly Active and Stable RuCX Nanosurface for Hydrogen Evolution Reaction in Alkaline Media

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Title
Crystal Phase Transition Creates a Highly Active and Stable RuCX Nanosurface for Hydrogen Evolution Reaction in Alkaline Media
Author(s)
Kim, Jeonghyeon; Kim, Hee Jin; Ruqia, Bibi; Kim, Mi Ji; Jang, Yeong-Ji; Jo, Tae Hwan; Baik, Hionsuck; Oh, Hyung-Suk; Chung, Hee-Suk; Kangkyun Baek; Noh, Siwoo; Jung, Moonjung; Kim, Ki-jeong; Lim, Hyung-Kyu; Youn, Young-Sang; Choi, Sang-Il
Publication Date
2021-12
Journal
Advanced Materials, v.33, no.48
Publisher
John Wiley and Sons Inc
Abstract
© 2021 Wiley-VCH GmbHAlthough metastable crystal structures have received much attention owing to their utilization in various fields, their phase-transition to a thermodynamic structure has attracted comparably little interest. In the case of nanoscale crystals, such an exothermic phase-transition releases high energy within a confined surface area and reconstructs surface atomic arrangement in a short time. Thus, this high-energy nanosurface may create novel crystal structures when some elements are supplied. In this work, the creation of a ruthenium carbide (RuCX, X < 1) phase on the surface of the Ru nanocrystal is discovered during phase-transition from cubic-close-packed to hexagonal-close-packed structure. When the electrocatalytic hydrogen evolution reaction (HER) is tested in alkaline media, the RuCX exhibits a much lower overpotential and good stability relative to the counterpart Ru-based catalysts and the state-of-the-art Pt/C catalyst. Density functional theory calculations predict that the local heterogeneity of the outermost RuCX surface promotes the bifunctional HER mechanism by providing catalytic sites for both H adsorption and facile water dissociation.
URI
https://pr.ibs.re.kr/handle/8788114/10833
DOI
10.1002/adma.202105248
ISSN
0935-9648
Appears in Collections:
Center for Self-assembly and Complexity(복잡계 자기조립 연구단) > 1. Journal Papers (저널논문)
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