Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Sanjib Baran Roy, Linh Truong, Jae Ho Jeon, Sunghun Lee, Sahng Kyoon Jerng, Euigeol Jung, Seong Chan Jun, Seung Hyun Chun

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Vertically oriented graphene nanohills (VGNHs) have been used to boost the hydrogen evolution reaction (HER) activities of various catalysts. To further enhance the HER efficiency, a chemical modification was applied to VGNHs, and a significant improvement was observed in this work. Specifically, the catalytic performances of electrodeposited CoP on as-grown VGNHs (CoP@VGNHs) and on HNO3-treated VGNHs (CoP@N-VGNHs) were compared. The HER performances of the CoP@N-VGNH hybrid were even superior to those of noble metals, manifesting low overpotentials (η10 = 30 mV in acid and η10 = 87 mV in alkali), fast electron transfer, and durability in both acidic and alkaline electrolytes. This emphasizes the potential of physically and chemically modified graphene in the realm of water electrolysis.

Original languageEnglish
JournalACS Applied Energy Materials
DOIs
StatePublished - 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

Keywords

  • cobalt phosphide (CoP)
  • doping
  • hydrogen evaluation reaction (HER)
  • overpotential
  • vertical graphene nanohills (VGNHs)

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