Single-Phase Perovskite SrIrO3Nanofibers as a Highly Efficient Electrocatalyst for a pH-Universal Oxygen Evolution Reaction

Seungsun Shin, Taehui Kwon, Kyungmin Kim, Minju Kim, Myung Hwa Kim, Youngmi Lee

Research output: Contribution to journalArticlepeer-review

Abstract

pH-universal electrocatalysts are desirable for high efficiency of water electrolysis. Herein, we report the facile synthesis of single-phase perovskite SrIrO3 nanofibers (NFs) and demonstrate that SrIrO3 NFs are promising electrocatalysts for the oxygen evolution reaction (OER) in a wide range of pH. Single-phase SrIrO3 NFs were synthesized by electrospinning and subsequent calcination processes, and the electrocatalytic performance of SrIrO3 NFs toward the OER was evaluated under acidic, neutral, and alkaline media. A large surface area due to the NF morphology with an average diameter of 105.5 (± 15.5) nm led to enhanced catalytic activity of SrIrO3 NFs, representing smaller overpotentials and Tafel slopes under pH-universal conditions than IrO2/Ir NFs and commercial Ir/C. SrIrO3 NFs also manifested remarkably stable activity for continuous OER operation in all three electrolytes, even though a considerable amount of Sr was leached out of them. The long-lasting high OER activity of SrIrO3 NFs could be ascribed to stable Ir cations taking B sites of the perovskite oxide structure, known as an active site for electrocatalysis. The initial perovskite crystal structure of SrIrO3 was maintained for a certain time even after significant Sr leaching. This work is the first application of SrIrO3 perovskite for pH-universal OER catalysis.

Original languageEnglish
JournalACS Applied Energy Materials
DOIs
StateAccepted/In press - 2022

Keywords

  • electrocatalyst
  • electrospinning
  • iridium
  • oxygen evolution reaction
  • perovskite
  • strontium

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