Single-Phase Perovskite SrIrO3 Nanofibers as a Highly Efficient Electrocatalyst for a pH-Universal Oxygen Evolution Reaction

电催化剂 钙钛矿(结构) 析氧 纳米纤维 氧气 材料科学 相(物质) 化学工程 催化作用 纳米技术 化学 无机化学 电极 电化学 物理化学 有机化学 工程类
作者
Seungsun Shin,Taehui Kwon,Kyungmin Kim,Minju Kim,Myung Hwa Kim,Youngmi Lee
出处
期刊:ACS applied energy materials [American Chemical Society]
卷期号:5 (5): 6146-6154 被引量:10
标识
DOI:10.1021/acsaem.2c00551
摘要

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.
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