期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 786, 期 -, 页码 826-838出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.02.052
关键词
Biomass-based carbon; Nitrogen doped; CO2 capture; Supercapacitor
资金
- National Natural Science Foundation of China [31700517]
- Shandong Provincial Natural Science Foundation, China [ZR2017BC100]
- Qingdao Applied Basic Research Program [18-2-2-4-jch, 17-1-1-52-jch]
- Special Grant from China Postdoctoral Fund [2018T110667]
- China Postdoctoral Science Foundation [2017M622155]
- Taishan Scholars Program of Shandong Province [ts201511033]
- Jiangsu key laboratory open fund of biomass energy and materials [JSBEM201802]
Two types of carbon microspheres with abundant nitrogen-containing groups and porous structure were prepared via feasible and cost-effective methods, using chitosan (NCS-T) and glucose (NCSNH3-T) as the raw materials, chitosan and ammonia as nitrogen source respectively. The effect of nitrogen sources on structure of N-doped porous carbon and their supercapacitors/CO2 adsorption performance were discussed in details. The obtained carbon materials both exhibit a graphite-like structure with developed porous structures. For the NCS-T samples, N-5 and N-6 were the main nitrogen-containing groups, and O-I and O-II were the main oxygen-containing groups. For NCSNH3-T samples, N exists as N-5, N-6 N-Q and N-X groups, and O exists as O-I, O-II, and O-III groups. Micro-mesoporous structures developed, and on the specific surface area, pore volumes are more developed in NCSNH3 -T, mainly due to ammonia activation, which results in additional micropores especially ultramicropores (sizes < 0.9 nm). The obtained carbon materials are well suited for use as an electrode material and adsorbent. In three-electrode system, the specific capacitances were in the range of 96-161 F/g for NCS-T, and the values reached 220 -244 F/g for NCSNH3-T at 0.2 A/g in 1 M H2SO4 electrolyte, it's the combination of electric double layer capacitors and faradaic pseudocapacitance. The CO2 capture capacities were 51-141 mg/g for NCS-T and 180-243 mg/g for NCSNH3 -T, due to the developed micropores and ultramicropores. The results suggest that NCSNH3 -T can be a candidate as both electrode material and adsorbent. (C) 2019 Elsevier B.V. All rights reserved.
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