Ruthenium core-shell engineering with nickel single-atoms for selective oxygen evolution via non-destructive mechanism
- Ruthenium core-shell engineering with nickel single-atoms for selective oxygen evolution via non-destructive mechanism
- 임희대; Ahmad M. Harzandi; Sahar Shadman; Arun S. Nissimagoudar; Dong Yeon Kim; Jong Hoon Lee; Min Gyu Kim; Hu Young Jeong; Youngsik Kim; Kwang S. Kim
- Issue Date
- Advanced Energy Materials
- VOL 11, NO 10, 2003448
- 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.
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