Boosting the oxygen evolution catalytic performance of perovskites via optimizing calcination temperature

Qian Lin, Yinlong Zhu, Zhiwei Hu, Yichun Yin, Hong Ji Lin, Chien Te Chen, Xiwang Zhang, Zongping Shao, Huanting Wang

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2 Citations (Scopus)

Abstract

We report a facile and universal strategy with simultaneous modulation of intrinsic activity and active site numbers to optimize the catalytic performance of perovskites via controlling calcination temperature. As a proof-of-concept, the optimized SCF-800 perovskite (SrCo0.5Fe0.5O3-δ prepared with a calcination temperature of 800 °C) shows prominent OER activity (e.g., 327 mV at 10 mA cm-2 on a glassy carbon electrode in 0.1 M KOH), outperforming the benchmark noble-metal RuO2 and ranking the highest among perovskite-based catalysts reported to date. Experimental results reveal that the reduced particle size (increased surface area) due to a lower calcination temperature provides more active sites, and that the favorable electronic structure with high covalency of metal-oxygen bonds, as demonstrated by advanced soft X-ray absorption spectroscopy (sXAS), contributes to the intrinsic activity enhancement. This work provides a new and facile way for improving the catalytic performance via only regulating preparation conditions.

Original languageEnglish
Pages (from-to)6480-6486
Number of pages7
JournalJournal of Materials Chemistry A
Volume8
Issue number14
DOIs
Publication statusPublished - 14 Apr 2020

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