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*

*この研究の対応する著者

研究成果: Article査読

22 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1152-1158
ページ数7
ジャーナルApplied Surface Science
487
DOI
出版ステータスPublished - 2019 9 1
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 物理学および天文学(全般)
  • 表面および界面
  • 表面、皮膜および薄膜

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