Respective influence of stoichiometry and NiOOH formation in hydrogen and oxygen evolution reactions of nickel selenides

Sengeni Anantharaj, Elangovan Subhashini, Karukkampalyam C. Swaathini, Thangavel S. Amarnath, Shubham Chatterjee, Kannimuthu Karthick, Subrata Kundu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Understanding the inherent activity of an electrocatalyst is an effective way of studying its optimization conditions for harvesting better performance. In this, we studied the inherent electrocatalytic activity of nickel selenide catalysts of three different stoichiometry such as Ni0.85Se, Ni3Se4 and NiSe2 in which the Se:Ni ration varies as 1.176, 1.333 and 2.0 respectively. The hydrogen evolution reaction (HER) of these catalysts was found to increase with the increasing Se:Ni ratio due to which NiSe2 turned out to be the better one among others. Interestingly, the oxygen evolution reaction (OER) of these catalysts showed a different trend irrespective of Se:Ni ratio where the ease of formation of NiOOH was found to control the kinetic current. Such influences of stoichiometry in HER and ease of NiOOH formation in OER had never been revealed before for nickel selenide system.

Original languageEnglish
Pages (from-to)1152-1158
Number of pages7
JournalApplied Surface Science
Volume487
DOIs
Publication statusPublished - 2019 Sep 1
Externally publishedYes

Keywords

  • Electrocatalysis
  • Hydrogen evolution
  • Nickel selenide
  • Oxygen evolution
  • Stoichiometry dependence

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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