期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 36, 页码 30626-30634出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07746
关键词
carbon materials; microwave; flake-like; sub-nanopores; supercapacitors
资金
- National Natural Science Foundation of China [51602281, 21273194]
- Natural Science Foundation of Jiangsu Province [BK20160473]
Popcorn-derived porous carbon flakes have been successfully fabricated from the biomass of maize. Utilizing the puffing effect, the nubby maize grain turned into materials with an interconnected honeycomb-like porous structure composed of carbon flakes. The following chemical activation method enabled the as-prepared products to possess optimized porous structures for electrochemical energy-storage devices, such as multilayer flake-like structures, ultrahigh specific surface area (S-BET: 3301 m(2) g(-1)), and a high content of micropores (microporous surface area of 95%, especially the optimized sub-nanopores with the size of 0.69 nm) that can increase the specific capacitance. The as-obtained sample displayed excellent specific capacitance of 286 F g(-1) at 90 A g(-1) for supercapacitors. Moreover, the unique porous structure demonstrated an ideal way to improve the volumetric energy density performance. A high energy density of 103 Wh kg(-1) or 53 Wh L-1 has been obtained in the case of ionic liquid electrolyte, which is the highest among reported biomass-derived carbon materials and will satisfy the urgent requirements of a primary power source for electric vehicles. This work may prove to be a fast, green, and large-scale synthesis route by using the large nubby granular materials to synthesize applicable porous carbons in energy-storage devices.
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