Preparation and electrocatalytic properties of spinel CoxFe3-xO4 nanoparticles
| Autor: | Peng Xiong, Fujun Yang, Zhenzhong Ding, Xiaoqin Chen, Yunjie Jia, Changping Yang, Xinsui Yan, Jiawei Liu |
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| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment Annealing (metallurgy) Spinel Energy Engineering and Power Technology Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Hydrothermal circulation 0104 chemical sciences Catalysis chemistry.chemical_compound Fuel Technology chemistry Chemical engineering engineering 0210 nano-technology Bifunctional |
| Zdroj: | International Journal of Hydrogen Energy. 45:13841-13847 |
| ISSN: | 0360-3199 |
| Popis: | The catalysts are often used in fuel cells and metal-air batteries to speed up electrochemical reactions. In this study, we prepared CoFe2O4 nanoparticles with mainly inverse spinel structure and FeCo2O4 nanoparticles with mainly spinel structure as bifunctional catalysts by hydrothermal method. After annealing at 350 °C, pure CoFe2O4 and FeCo2O4 nanoparticles with uniform size distribution have been obtained. The CoFe2O4 nanoparticles showed high current density of 5.5 mA/cm2 at −0.8 V in the ORR test. It's low Tafel slope of 83.0 mV/dec further confirmed the excellent ORR catalytic properties of CoFe2O4 nanoparticles. Furthermore, the CoFe2O4 nanoparticles also showed good OER properties with satisfied current density of 35.7 mV/cm2 at l.0 V and low OER Tafel slope of 71.0 mV/dec. Both the ORR and OER properties of CoFe2O4 nanoparticles showed good time stability which were compared with FeCo2O4 nanoparticles. These results indicated that CoFe2O4 nanoparticles with mainly inverse spinel structure had better electrocatalytic performance than FeCo2O4 nanoparticles with mainly spinel structure. The CoFe2O4 nanoparticles with mainly inverse spinel structure show a significant potential application in rechargeable battery. |
| Databáze: | OpenAIRE |
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