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

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

来源：ACS Applied Materials & Interfaces, 2017, 9(34): 28604-28611.

DOI：10.1021/acsami.7b08704

• bacterial cellulose
• carbonization
• highly N-doped
• three-dimensional
• sodium storage

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) 800 were synthesized by an adsorption swelling strategy using BC as the carbonaceous 0) material. When used as anode materials for sodium-ion batteries, the NDCFs deliver a 600 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.

• 出版日期2017-8-30
• 单位华中科技大学