5 years ago

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

Highly Nitrogen-Doped Three-Dimensional Carbon Fibers Network with Superior Sodium Storage Capacity
Ya-Ping Deng, Jingde Li, Wen Lei, Gaoran Li, Deli Wang, Zhongwei Chen, Zexing Wu, Weiping Xiao, Dan Luo, Cuijuan Xuan
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.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b08704

DOI: 10.1021/acsami.7b08704

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