Cu2O−Cu2Se Mixed-Phase Nanoflake Arrays: pH-Universal Hydrogen Evolution Reactions with Ultralow Overpotential

Chaiti Ray, Su Chan Lee, Bingjun Jin, Kyung Yoon Chung, Shiyin Guo, Shengli Zhang, Kan Zhang, Jong Hyeok Park, Seong Chan Jun

Research output: Contribution to journalArticle

Abstract

Most developed hydrogen evolution reaction (HER) electrocatalysts have pH-dependent functionalities, which limit their universal applications. Pt, the ideal HER electrocatalyst, is also highly effective in specific pH conditions. In the present article, we report a copper-based transition-metal chalcogenide from anion engineering. Hierarchical three-dimensional (3D) Cu2O−Cu2Se nanoflake arrays (COCS NFs) are grown directly on nickel foam (NF) by combining the rapid electrodeposition technique with the room temperature wet-chemical selenization method. Via the synergetic effects of the proper ratio of Se and O, as-synthesized COCS NFs manage to accomplish key-requirements for pH-universal HER performances with overpotential values of 52.9, 62.8, and 77.8 mV, in alkaline, neutral, and acidic media, respectively, at 10 mA cm−2. The electrocatalyst also possesses superb stability at constant 10 mA cm−2 current density for 50 h in all electrolytes. This work offers a synthesis protocol of a mixed-anion composite with the revelation about the importance of anion modulation towards electrode surface properties and HER performances.

Original languageEnglish
Pages (from-to)5014-5021
Number of pages8
JournalChemElectroChem
Volume6
Issue number19
DOIs
Publication statusPublished - 2019 Oct 1

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Electrochemistry

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