Park, Han-Saem Yang, Juchan Cho, Min Kyung Lee, Yeongdae Cho, Seonghun Yim, Sung-Dae Kim, Byeong-Su Jang, Jong Hyun Song, Hyun-Kon 2024-01-19T21:03:13Z 2024-01-19T21:03:13Z 2021-09-05 2019-01 2211-2855 https://pubs.kist.re.kr/handle/201004/120524 Partially hydrous RuO2 nanocluster embedded in a carbon matrix (x-RuO2@C with x = hydration degree = 0.27 or 0.27@C) is presented as a bifunctional catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for water splitting. Symmetric water electrolyzers based on 0.27-RuO2@C for both electrodes showed smaller potential gaps between HER and OER at pH 0, pH 14 and even pH 7 than conventional asymmetric electrolyzers based on two different catalysts (Pt/C parallel to Ir/C) that have been known as the best catalysts for HER and OER respectively. Moreover, 0.27-RuO2@C showed another bifunctional electroactivity for fuel cell electrochemistry involving hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) that are the backward reactions of HER and OER respectively. Pt-level HOR electroactivity was obtained from 0.27-RuO2@C, while its ORR activity was inferior to that of Pt with 200 mV higher overpotential required. The tetra-functionality of 0.27-RuO2@C showed the possibility of realizing single-catalyst regenerative fuel cells. English ELSEVIER BIFUNCTIONAL ELECTROCATALYSTS NANOWIRE ARRAYS WATER OXIDATION DOPED GRAPHENE CARBON HYBRIDS EFFICIENT EVOLUTION METAL CATALYST NANOPARTICLES RuO2 nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry Article 10.1016/j.nanoen.2018.10.017 1 NANO ENERGY, v.55, pp.49 - 58 NANO ENERGY 55 49 58 scie scopus 000454636200006 2-s2.0-85055754712 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article BIFUNCTIONAL ELECTROCATALYSTS NANOWIRE ARRAYS WATER OXIDATION DOPED GRAPHENE CARBON HYBRIDS EFFICIENT EVOLUTION METAL CATALYST NANOPARTICLES Multi-functional electrocatalysts Water splitting Carbon coated metal oxides All-pH electrolysis Regenerative fuel cells