CoII-catalyzed room-temperature growth of MnO2 on the skeleton of carbonized zeolitic imidazolate framework-67 crystals for boosting oxygen reduction reaction
| Autor: | Lin-Nan Zhou, Wen-Tao Kuang, Jing-Xuan Zhang, Yong-Jun Li, Jing Cheng, Xia Yin |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Carbonization Nanoparticle 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Electrochemistry Redox Catalysis chemistry.chemical_compound chemistry Chemical engineering Imidazolate General Materials Science Methanol 0210 nano-technology Zeolitic imidazolate framework |
| Zdroj: | Journal of Materials Chemistry A. 7:4699-4704 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c8ta11658j |
| Popis: | MnO2/C composites are widely used as cathode active materials or electrocatalysts in electrochemical power sources. Compared with a physical mixture of MnO2 and carbon materials, the growth of MnO2 on the surface of carbon can greatly improve the electrochemical performance of MnO2/C, and is usually performed at a temperature higher than 100 °C. From the viewpoint of sustainable development, the room-temperature growth of MnO2 on carbon would greatly reduce the cost and thermal pollution. Herein, at room temperature, we successfully planted MnO2 nanosheets over carbon particles, achieving MnO2/C composites through a redox reaction between MnO4− ions and carbonized zeolitic imidazolate framework-67 (ZIF-67) crystals (CZIF-67). Room-temperature growth of MnO2 may be attributed to the catalytic effect of CoII ions of Co3O4 nanoparticles formed during ZIF-67 carbonization. The resulting MnO2/CZIF-67 composites exhibit excellent catalytic performance towards the oxygen reduction reaction: the onset potential, the half-wave potential, and the electron transfer number are ∼0.88 V, ∼0.79 V and 3.6, respectively, which are close to the corresponding values of the state-of-the-art Pt/C. Also, the resulting MnO2/CZIF-67 shows better long-term durability and methanol tolerance than Pt/C, indicative of its potential applications in fuel cells and metal–air batteries. |
| Databáze: | OpenAIRE |
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