Discontinuity-Enhanced Thin Film Electrocatalytic Oxygen Evolution

Ming Chi Shih, Ren Huai Jhang, Ya Ting Tsai, Chia Wei Huang, Yung Jr Hung, Mei Yi Liao, Jiaxing Huang*, Chun Hu Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Thin film electrocatalysts allow strong binding and intimate electrical contact with electrodes, rapid mass transfer during reaction, and are generally more durable than powder electrocatalysts, which is particularly beneficial for gas evolution reactions. In this work, using cobalt manganese oxyhydroxide, an oxygen evolution reaction (OER) electrocatalyst that can be grown directly on various electrodes as a model system, it is demonstrated that breaking a continuous film into discontinuous patches can significantly enhance the overall OER performance without sacrificing long-term stability even under elevated electrocatalytic stress. Discontinuous films with higher edge-to-area ratios exhibits reduced overpotentials, increased turnover frequency, and more pronounced current increase after electrochemical conditioning. Operando Raman spectroscopy studies during electrocatalysis reveal that the film edges require lower potential barrier for activation. Introducing discontinuity into thin film electrocatalysis can thus lead to the realization of high performance yet highly robust systems for harsh gas evolution reactions.

Original languageEnglish (US)
Article number1903363
JournalSmall
Volume15
Issue number50
DOIs
StatePublished - Dec 1 2019

Keywords

  • cobalt oxide
  • electrocatalysis
  • manganese oxide
  • oxygen evolution
  • thin films

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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