Single-Phase Perovskite SrIrO3Nanofibers as a Highly Efficient Electrocatalyst for a pH-Universal Oxygen Evolution Reaction
- 주제(키워드) electrocatalyst , electrospinning , iridium , oxygen evolution reaction , perovskite , strontium
- 등재 SCIE, SCOPUS
- 발행기관 American Chemical Society
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000193561
- 본문언어 영어
- Published As https://doi.org/10.1021/acsaem.2c00551
초록/요약
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. © 2022 American Chemical Society.
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