文献类型：期刊文献

英文题名：Engineering Se/N Co-Doped Hard CNTs with Localized Electron Configuration for Superior Potassium Storage

作者：Xu, Da[1];Cheng, Qilin[1];Saha, Petr[2];Hu, Yanjie[1];Chen, Ling[3];Jiang, Hao[1];Li, Chunzhong[1,3]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Trida T Bati 5678, Zlin 76001, Czech Republic;[3]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem Engn, Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：33

期号：5

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20224713150661);WOS:【SCI-EXPANDED(收录号:WOS:000888398400001)】；

基金：Acknowledgements This work was supported by the National Natural Science Foundation of China (22208102, 21975074), the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：cycle life; electron configurations; hard-CNTs; heteroatom doping; K-ion batteries

摘要：The earth-abundant hard carbons have drawn great concentration as potassium-ion batteries (KIBs) anode materials because of their richer K-storage sites and wider interlayer distance versus graphite, but suffer from a low electrochemical reversibility. Herein, the novel Se/N co-doped hard-carbon nanotubes (h-CNTs) with localized electron configuration are demonstrated by creating unique N-Se-C covalent bonds stemmed from the precise doping of Se atoms into carbon edges and the subsequent bonding with pyrrole-N. The strong electron-donating ability of Se atoms on d-orbital provides abundant free electrons to effectively relieve charge polarization of pyrrole-N-C bonds, which contributes to balance the K-ion adsorption/desorption, therefore greatly boosting reversible K-ion storage capacity. After filtering into self-standing anodes with weights of 1.5-12.4 mg cm(-2), all of them deliver a high reversible gravimetric capacity of 341 +/- 4 mAh g(-1) at 0.2 A g(-1) and a linear increasing areal capacity to 4.06 mAh cm(-2). The self-standing anode can still maintain 209 mAh g(-1) at 8.0 A g(-1) (93.3% retention) for a long period of 2000 cycles with a constant Se/N content.