An electrodeposition approach to metal/metal oxide heterostructures for active hydrogen evolution catalysts in near-neutral electrolytes

Michael J. Kenney, Jianan Erick Huang, Yong Zhu, Yongtao Meng, Mingquan Xu, Guanzhou Zhu, Wei Hsuan Hung, Yun Kuang, Mengchang Lin, Xiaoming Sun, Wu Zhou, Hongjie Dai

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes. However, catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions. Here we report a simple electrodeposition and reductive annealing procedure to produce a highly active Ni-Co-Cr metal/metal oxide heterostructured catalyst directly on Ni foam. The resulting electrocatalyst for hydrogen evolution reaction (HER) requires only 198 mV of overpotential to reach 100 mA/cm 2 in 1 M potassium phosphate (pH = 7.4) and can operate for at least two days without significant performance decay. Scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) imaging reveals a Ni-Co alloy core decorated with blended oxides layers of NiO, CoO and Cr 2 O 3 . The metal/metal oxide interfaces are suggested to be responsible for the high HER activity. [Figure not available: see fulltext.].

Original languageEnglish
JournalNano Research
DOIs
Publication statusAccepted/In press - 2019
Externally publishedYes

Keywords

  • catalysis
  • chemical mapping
  • hydrogen evolution
  • nanostructured materials
  • water splitting

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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