SrIrO3 modified with laminar Sr2IrO4 as a robust bifunctional electrocatalyst for overall water splitting in acidic media 

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lijie Zhang
  • Haeseong Jang
  • Huihui Liu
  • Min Gyu Kim
  • Xien Liu
  • Jaephil Cho

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number129604
Journal / PublicationChemical Engineering Journal
Volume419
Online published6 Apr 2021
Publication statusPublished - 1 Sep 2021

Abstract

Strontium iridate perovskites are attractive electrocatalysts for acidic water oxidation, but suffer from serious Sr-leaching during catalysis, which causes surface rearrangements that damage long-term applications. Herein, 6H phase SrIrO3 modified with laminar Sr2IrO4 (SrIrO) have been developed. Unlike the previous extreme chemical state changes of Ir, SrIrO maintained relatively stable surface Ir states during electrocatalysis. The layered nature of Sr2IrO4 enables the interlaminar Sr easily extracted from the crystal while remaining the in-plane IrO6 octahedral framework, thereby stabilizing the Ir state. The SrIrO displays extremely low overpotential of 245 mV for OER and 18.2 mV for HER at 10 mA cm−2, and outstanding catalytic stability. For acidic water splitting, SrIrO requires only 1.50 V to achieve 10 mA cm−2, surpassing most reported electrocatalysts. This work offers a new route for alleviating the surface rearrangements of perovskites, and exploring efficient and stable electrocalysts for hydrogen production via electrochemical water electrolysis.

Research Area(s)

  • Acidic medium, Bifunctional electrocatalysts, Overall water splitting, Oxygen evolution reaction, Strontium iridate perovskites

Citation Format(s)

SrIrO3 modified with laminar Sr2IrO4 as a robust bifunctional electrocatalyst for overall water splitting in acidic media . / Zhang, Lijie; Jang, Haeseong; Li, Zijian; Liu, Huihui; Kim, Min Gyu; Liu, Xien; Cho, Jaephil.

In: Chemical Engineering Journal, Vol. 419, 129604, 01.09.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review