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Single-Phase Perovskite SrIrO3 Nanofibers as a Highly Efficient Electrocatalyst for a pH-Universal Oxygen Evolution Reaction
- Title
- Single-Phase Perovskite SrIrO3 Nanofibers as a Highly Efficient Electrocatalyst for a pH-Universal Oxygen Evolution Reaction
- Authors
- Shin, Seungsun; Kwon, Taehui; Kim, Kyungmin; Kim, Minju; Kim, Myung Hwa; Lee, Youngmi
- Ewha Authors
- 이영미; 김명화
- SCOPUS Author ID
- 이영미; 김명화
- Issue Date
- 2022
- Journal Title
- ACS APPLIED ENERGY MATERIALS
- ISSN
- 2574-0962
- Citation
- ACS APPLIED ENERGY MATERIALS vol. 5, no. 5, pp. 6146 - 6154
- Keywords
- electrospinning perovskite; iridium; strontium; electrocatalyst; oxygen evolution reaction
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- 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.
- DOI
- 10.1021/acsaem.2c00551
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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