期刊
CHEMISTRY OF MATERIALS
卷 31, 期 9, 页码 3274-3280出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b00204
关键词
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资金
- China Scholarship Council (CSC)
- Alexander von Humboldt foundation
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2008/1, 390540038]
- Berlin Graduate School of Natural Sciences and Engineering (BIG-NSE)
The rational design and synthesis of mesoporous functional materials is of great significance to tackle fundamental challenges in materials science and to yield practical solutions for efficient energy utilization. Here, a novel p-toluenesulfonic acid assisted mechanochemical approach is used to prepare a silicatemplated bipyridine-containing covalent organic framework (COF), which can be further converted into an iron nitrogen-doped mesoporous carbon (mC-TpBpy-Fe) upon carbonization and template removal. The resulting mC-TpBpy-Fe exhibits a large pore volume and surface area, which significantly promote the mass transfer efficiency and increase the accessibility of the active sites, yielding a high ORR activity with a competitive half-wave potential of 0.845 V and limiting current density of 5.92 mA/cm(2) (vs 0.852 V and 5.57 mA/cm(2) for Pt/C). Application of this COF derived mesoporous carbon within a Zn-air battery revealed that it can operate in ambient conditions with a competitive discharge performance, showing its potential for practical applications.
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