Journal
FARADAY DISCUSSIONS
Volume 190, Issue -, Pages 147-159Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5fd00215j
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Funding
- National Natural Science Foundation of China [51325102]
- International Science & Technology Cooperation Program of China (ISTCPC) [2015DFA90750]
- Program for Creation Team of Hubei Province [2015CFA017]
- Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory
- Young-talent Chenguang Project of Wuhan City
- West Light Foundation of The Chinese Academy of Sciences
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Carbon powders are building blocks for electrochemical energy storage/conversion devices. Green, cost-affordable and facile preparation of carbon with applicable electrochemical properties is therefore essential for effective utilization of fluctuating renewable energy. Herein, the preparation of carbon nanoflakes via impregnation of waste biomass i.e. boiled coffee beans in molten Na2CO3-K2CO3 (with equal mass) at 800 degrees C and molten CaCl2 at 850 degrees C is reported. The microstructure and surface chemistry of the obtained carbons are specified. The correlations between synthetic conditions and microstructure/surface chemistry of the obtained carbons are rationalized. The derived carbon nanosheets are tested and compared as active materials for supercapacitors in a configuration of symmetric full cells in 1 M MeEt3NBF4 in acetonitrile and electrocatalysts towards the oxygen reduction reaction (ORR) in O-2-saturated 0.1 M aqueous KOH. Despite the lower surface area, the carbon nanosheets derived in molten Na2CO3-K2CO3 exhibit enhanced capacitive properties and electrocatalytic ORR activity. The present study highlights the importance of thermal media on the microstructure, surface chemistry and electrochemistry of carbon from biomass.
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