V3+ Incorporated β-Co(OH)2: A Robust and Efficient Electrocatalyst for Water Oxidation

Sengeni Anantharaj, Kannimuthu Karthick, Palanichamy Murugan, Subrata Kundu*

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Catalyzing oxygen evolution reaction (OER) with the lowest possible overpotential is a key to ensure energy efficiency in the production of hydrogen from water electrochemically. In this report, we show the results that astonished us. Co hydroxide containing trivalent V was prepared chemically and screened for electrochemical water oxidation in rigorously Fe free 1 M KOH (pH 13.8). Overpotential of 198 mV at 10 mA cm-2 was observed for the synthesized Co-V hydroxide with the optimal Tafel slope of 60 mV dec-1. This is the lowest overpotential at this current density ever reported for OER in alkaline conditions while utilizing Co based electrocatalysts. Density function theory (DFT) calculations showed that the third elementary step (oxyhydroxide formation and delivery of O2) was spontaneous on V site that is bridging two adjacent Co sites which was attributed to the observed enhancement.

本文言語English
ページ(範囲)730-740
ページ数11
ジャーナルInorganic Chemistry
59
1
DOI
出版ステータスPublished - 2020 1月 6
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 無機化学

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