Single Phase Trimetallic Spinel CoCrxRh2-xO4 Nanofibers for Highly Efficient Oxygen Evolution Reaction under Freshwater Mimicking Seawater Conditions

Dasol Jin, Hyerim Woo, Sampath Prabhakaran, Youngmi Lee, Myung Hwa Kim, Do Hwan Kim, Chongmok Lee

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Electrochemical water splitting is a promising pathway for sustainable oxygen production in terms of energy conversion. Seawater electrolysis, especially, is a sustainable approach to carbon-neutral energy conversion without reliance on freshwater; however, extreme corrosion of anodic electrode caused by highly corrosive Cl is a main challenge of seawater oxidation. To address this issue, herein, nanofibers of trimetallic spinel CoCrxRh2-xO4 with various composition ratios are prepared for highly sustained water oxidation electrocatalysis. Among a series of CoCrxRh2-xO4, CoCr0.7Rh1.3O4 nanofibers exhibit excellent electrocatalytic activity for oxygen evolution reaction (OER): the highest mass activity, the lowest overpotential at 10 mA cm−2 and the smallest Tafel slope with robust long-term stability under alkaline electrolyte. In addition, CoCr0.7Rh1.3O4 nanofibers deliver better OER performances in simulated seawater than a commercial benchmark catalyst (IrO2 nanoparticles), demonstrating that feasibility of alkaline seawater electrolysis with CoCr0.7Rh1.3O4 nanofibers as an OER electrocatalyst.

Original languageEnglish
Article number2301559
JournalAdvanced Functional Materials
Volume33
Issue number25
DOIs
StatePublished - 19 Jun 2023

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • cobalt-chromium-rhodium spinel oxides (CoCr Rh O )
  • nanofibers
  • oxygen evolution reactions
  • seawater electrocatalysis

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