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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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RuO2 nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry

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Title
RuO2 nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry
Author
Park, HSYang, JuchanCho, Min KyungLee, YeongdaeCho, SeonghunYim, Sung-DaeKim, Byeong-SuJang, Jong HyunSong, Hyun-Kon
Keywords
Multi-functional electrocatalystsWater splittingCarbon coated metal oxidesAll-pH electrolysisRegenerative fuel cells
Issue Date
201901
Publisher
Elsevier BV
Citation
NANO ENERGY, v.55, no., pp.49 - 58
Abstract
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 || 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.
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DOI
http://dx.doi.org/10.1016/j.nanoen.2018.10.017
ISSN
2211-2855
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ECHE_Journal Papers

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