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

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


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
Publication statusPublished - 2019 Jan

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering


Dive into the research topics of 'RuO2 nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry'. Together they form a unique fingerprint.

Cite this