Porous hollow nanorod structured chromium-substituted inverse spinel compound: An efficient oxygen evolution reaction catalyst

Prakash Ramakrishnan, Keon Beom Lee, Geon Ju Choi, Il Kyu Park, Jung Inn Sohn

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Spinel-based oxygen evolution reaction (OER) catalyst using various cation substitution strategies is gained importance due to its improved catalyst performance. Herein, we report the chromium (Cr)-substituted nickel ferrite, inverse spinel compound (NiCrFeO4) of porous hollow nanostructure using a simple electrospinning approach. The developed inverse spinel compound displays a nanorod-shaped nanostructure of an overall diameter of 60 ± 10 nm and an inner hollow thickness of 30 ± 10 nm. In this study, the Cr-substituted catalyst delivers an overpotential value of 298 mV which is lower than the developed electrospun-based Cr-free NiFe2O4 (330 mV) and the commercial-based NiFe2O4 (330 mV) compound at 10 mA cm−1 under 1 M KOH. Further, the Cr-substituted catalyst exhibits a low Tafel slope value of 44.7 mV dec-1 than the RuO2 catalyst (63.7 mV dec-1). In addition, the catalyst is able to deliver excellent OER durability of 14 hrs at voltage retention of 94.5 % at 10 mA cm−2 condition. In this study, a simple method and a favorable nanostructure to unveil a potential OER candidate are developed.

Original languageEnglish
Pages (from-to)178-185
Number of pages8
JournalJournal of Industrial and Engineering Chemistry
Volume101
DOIs
StatePublished - 25 Sep 2021

Keywords

  • Electrocatalyst
  • Hollow structure
  • Nanorod
  • Nickel ferrite
  • Spinel
  • Substitution

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