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

Han Saem Park, Juchan Yang, Min Kyung Cho, Yeongdae Lee, Seonghun Cho, Sung Dae Yim, Byeong Su Kim, Jong Hyun Jang, Hyun Kon Song

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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.

Original languageEnglish
Pages (from-to)49-58
Number of pages10
JournalNano Energy
Volume55
DOIs
Publication statusPublished - 2019 Jan

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

Park, H. S., Yang, J., Cho, M. K., Lee, Y., Cho, S., Yim, S. D., Kim, B. S., Jang, J. H., & Song, H. K. (2019). RuO2 nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry. Nano Energy, 55, 49-58. https://doi.org/10.1016/j.nanoen.2018.10.017