Boosting the oxygen evolution catalytic performance of perovskites via optimizing calcination temperature
| Autor: | Zongping Shao, Yinlong Zhu, Xiwang Zhang, Chien-Te Chen, Qian Lin, Huanting Wang, Yichun Yin, Hong-Ji Lin, Zhiwei Hu |
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| Rok vydání: | 2020 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Chemical substance Absorption spectroscopy Renewable Energy Sustainability and the Environment Oxygen evolution 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy 0104 chemical sciences Catalysis law.invention Chemical engineering law General Materials Science Calcination 0210 nano-technology Science technology and society Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry A. 8:6480-6486 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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