A phase-transition-assisted method for the rational synthesis of nitrogen-doped hierarchically porous carbon materials for the oxygen reduction reaction
| Autor: | Wei Li, Qian He, Wei Ding, Sicheng Tao, Jinxia Jiang, Wanglan Wang, Jing Li, Zidong Wei |
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| Rok vydání: | 2018 |
| Předmět: |
Phase transition
Chemical substance Materials science Renewable Energy Sustainability and the Environment 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Micrometre Chemical engineering Specific surface area General Materials Science Nanometre 0210 nano-technology Science technology and society Porosity |
| Zdroj: | Journal of Materials Chemistry A. 6:878-883 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta09435c |
| Popis: | Herein, we report a phase-transition-assisted strategy that uses gas–liquid separation coupled with a gas–liquid interfacial reaction during the phase transition of precursors for constructing hierarchically porous carbon materials (HPCMs) with tunable interconnected macropore channels, and simultaneously conducting the formation of active sites along these channel walls for the oxygen reduction reaction (ORR). A HPCM with an ultrahigh specific surface area of 1141.41 m2 g−1 and a highly interconnected macroporous network was produced, in which the active sites are exactly located on the mass-transport channels. By adjusting the precursor's solidification rates, the porosity of HPCMs can be exactly tuned from the micrometer to the nanometer level. Such an excellent structure, by benefiting the fast mass transport and maximizing the utilization of active sites, leads to an excellent ORR performance with a half-wave potential of 0.901 V which exceeds that of the state-of-the-art Pt/C catalyst by 40 mV. |
| Databáze: | OpenAIRE |
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