Hexagonal NiO nanosheets on Ni-foam as an electrocatalyst for high-performance water splitting application

Rajneesh Kumar Mishra, Vipin Kumar, Gyu Jin Choi, Jeong Won Ryu, Sagar M. Mane, Jae Cheol Shin, Jin Seog Gwag

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This study illustrates the catalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities of the hexagonal NiO nanosheets on Ni-foam. The NiO electrocatalyst demonstrates the low overpotentials of 83 mV/380 mV and low Tafel slopes of 209 mV dec−1/299 mV dec−1 during HER/OER, respectively. It also reveals excellent stability, showing a slight change in overpotentials of 116 mV and 430 mV during HER/OER after 2000 CV cycles. Electrochemical impedance spectroscopy spectra show the series resistance of 0.83 Ω/1.04 Ω and charge-transfer resistance of 1.63 Ω/4.70 Ω during HER/OER after 2000 CV cycles.

Original languageEnglish
Article number132740
JournalMaterials Letters
Volume324
DOIs
StatePublished - 1 Oct 2022

Keywords

  • Hexagonal NiO nanosheets
  • Hydrogen evolution reaction
  • Oxygen evolution reaction
  • Stability
  • Water splitting

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