Ruthenium core-shell engineering with nickel single-atoms for selective oxygen evolution via non-destructive mechanism

Title
Ruthenium core-shell engineering with nickel single-atoms for selective oxygen evolution via non-destructive mechanism
Authors
임희대Ahmad M. HarzandiSahar ShadmanArun S. NissimagoudarDong Yeon KimJong Hoon LeeMin Gyu KimHu Young JeongYoungsik KimKwang S. Kim
Issue Date
2021-03
Publisher
Advanced Energy Materials
Citation
VOL 11, NO 10, 2003448
Abstract
To develop effective electrocatalytic splitting of acidic water, which is a key reaction for renewable energy conversion, the fundamental understanding of sluggish/destructive mechanism of the oxygen evolution reaction (OER) is essential. Through investigating atom/proton/electron transfers in the OER, the distinctive acid-base (AB) and direct­coupling (DC) lattice oxygen mechanisms (LOMs) and adsorbates evolution mechanism (AEM) are elucidated, depending on the surface­defect engineering condition. The designed catalysts are composed of a compressed metallic Ru­core and oxidized Ru­shell with Ni single atoms (SAs). The catalyst synthesized with hot acid treatment selectively follows AB­LOM, exhibiting simultaneously enhanced activity and stability. It produces a current density of 10/100 mA cm-2 at a low overpotential of 184/229 mV and sustains water oxidation at a high current density of up to 20 mA cm-2 over ~200 h in strongly acidic media.
URI
http://pubs.kist.re.kr/handle/201004/72826
ISSN
1614-6832
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KIST Publication > Article
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