Interface Engineering of Oxygen Vacancy-Enriched Ru/RuO2-Co3O4 Heterojunction for Efficient Oxygen Evolution Reaction in Acidic Media

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Scopus Citations
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Author(s)

  • Tiantian Wang
  • Haeseong Jang
  • Min Gyu Kim
  • Qing Qin
  • Xien Liu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)5155–5163
Journal / PublicationACS Sustainable Chemistry & Engineering
Volume11
Issue number13
Online published24 Mar 2023
Publication statusPublished - 3 Apr 2023

Abstract

RuO2 is currently regarded as a benchmark electrocatalyst for water oxidation in acidic media. However, its wide application is still restricted by limited durability and high cost. Herein, we report a Ru/RuO2-Co3O4 catalyst for boosting the acidic oxygen evolution reaction catalytic performance via constructing a heterointerface between RuO2 and Co3O4 and vacancy engineering. The resulting Ru/RuO2-Co3O4 shows a 226 mV overpotential at 10 mA cm-2 and excellent stability with a small overpotential increase after continuous testing for 19 h, greatly surpassing that of commercial RuO2 in a 0.1 M HClO4 solution. Depth structure characterizations involved in XPS, XANES, and EXAFS indicate that the favorable catalytic performance of Ru/RuO2-Co3O4 is mainly ascribed to the interfacial charge transfer by heterojunction interfaces between Co species and Ru species. Co3O4 is adjacent to RuO2 and donates electrons, making the valence state of Ru lowered and the Ru-O covalency weakened, which greatly suppress the dissolution of Ru and thus enhance stability. Meanwhile, the existing oxygen vacancies improve the intrinsic catalytic activity. This study is highly expected to favor the design and synthesis of more highly efficient electrocatalysts applied in energy-related devices. © 2023 American Chemical Society

Research Area(s)

  • electrocatalyst, oxygen evolution reaction, heterojunction, acid media, charge transfer, METAL-ORGANIC FRAMEWORKS, LAYERED DOUBLE HYDROXIDE, CATALYSTS, PH, ELECTROCATALYSTS, NANOWIRES

Citation Format(s)

Interface Engineering of Oxygen Vacancy-Enriched Ru/RuO2-Co3O4 Heterojunction for Efficient Oxygen Evolution Reaction in Acidic Media. / Wang, Tiantian; Li, Zijian; Jang, Haeseong et al.
In: ACS Sustainable Chemistry & Engineering, Vol. 11, No. 13, 03.04.2023, p. 5155–5163.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review