journal article·2017-08-30

Highly Nitrogen-Doped Three-Dimensional Carbon Fibers Network with Superior Sodium Storage Capacity

Wen Lei, Weiping Xiao, Jingde Li, Gaoran Li, Zexing Wu, Cuijuan Xuan, Dan Luo, Ya-Ping Deng, Deli Wang, Zhongwei Chen

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Abstract

Inspired by the excellent absorption capability of spongelike bacterial cellulose (BC), three-dimensional hierarchical porous carbon fibers doped with an ultrahigh content of N (21.2 atom %) (i.e., nitrogen-doped carbon fibers, NDCFs) were synthesized by an adsorption–swelling strategy using BC as the carbonaceous material. When used as anode materials for sodium-ion batteries, the NDCFs deliver a high reversible capacity of 86.2 mAh g –1 even after 2000 cycles at a high current density of 10.0 A g –1 . It is proposed that the excellent Na + storage performance is mainly due to the defective surface of the NDCFs created by the high content of N dopant. Density functional theory (DFT) calculations show that the defect sites created by N doping can strongly “host” Na + and therefore contribute to the enhanced storage capacity.
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Research context

OpenAlex topics: Advancements in Battery Materials · Supercapacitor Materials and Fabrication · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China

Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Waterloo Institute for Sustainable Energy, University of Waterloo, 200 University Avenue W, Waterloo, Ontario N2L 3G1, Canada

Funding

University of Waterloo · Waterloo Institute for Nanotechnology, University of Waterloo · China Scholarship Council · Natural Sciences and Engineering Research Council of Canada · National Natural Science Foundation of China · Central People's Government of the People's Republic of China

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