Electrochemically Robust Ferberite (FeWO4) Nanostructure as an Anode Material for Alkaline Water- and Alcohol-Oxidation Reaction

Mrinal Kanti Adak, Anubha Rajput, Laxmikanta Mallick, Biswarup Chakraborty

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Due to the inferior conductivity and lability to dissolution during electrocatalysis, iron catalysts lack superior electrochemical performance. However, recent studies on transition-metal oxyhydroxides depict that iron is the active site for water oxidation. Herein, a heterobimetallic ferberite iron-tungstate nanostructure has been employed as an efficient anode material not only for alkaline oxygen evolution reaction (OER) involving water and ethanol oxidation but also as a non-noble metal-based anode for overall water splitting (OWS). The presence of tungstate in the nanostructure improves the efficiency of OER, as reflected in the overpotential value of 282 (±3) mV at 10 mA cm-2 and the Tafel slope of 54 mV dec-1, which is far better compared to that of pure iron-oxyhydroxides as well as some noble metal-based catalysts. A fair activity of the FeWO4 anode further helped to construct a water electrolyzer coupled with a commercial Pt cathode, giving a cell potential of only 1.66 V to reach 10 mA cm-2 current density. The strong binding of [FeO6] with the corner- and edge-shared [WO6] presumably provides facile electron conduction as well as robustness in the structure, which results in long durability during OER and OWS. This study showcases a facile approach to design a stable anode relying on earth-abundant metal precursors, which has remained a perdurable challenge so far.

Original languageEnglish
Pages (from-to)5652-5665
JournalACS Applied Energy Materials
Volume5
Issue number5
DOIs
StatePublished - Apr 2022
Externally publishedYes

Keywords

  • alcohol electro-oxidation
  • electrocatalysis
  • ferberite FeWO
  • oxygen-evolution reaction
  • robust iron material

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Electrochemically Robust Ferberite (FeWO4) Nanostructure as an Anode Material for Alkaline Water- and Alcohol-Oxidation Reaction'. Together they form a unique fingerprint.

Cite this