文献类型：期刊文献

英文题名：Heterogeneous MoSe2/Nitrogen-Doped-Carbon Nanoarrays: Engineering Atomic Interface for Potassium-Ion Storage

作者：Xu, Da[1];Chen, Ling[2];Su, Xiaozhi[3];Jiang, Hongliang[1];Lian, Cheng[2];Liu, Honglai[2];Chen, Long[2];Hu, Yanjie[1];Jiang, Hao[1];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Frontiers Sci Ctr Materiobiol & Dynam Chem, Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201210, Peoples R China

年份：2022

卷号：32

期号：8

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20214611145984);WOS:【SCI-EXPANDED(收录号:WOS:000716303100001)】；

基金：This work was supported by the National Natural Science Foundation of China (21975074, 91834301 and 51621002), 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：electrochemical reversibility; geometric structures; heterogenous interfaces; K-ion batteries; MoSe; (2)

摘要：Owing to the lower price and higher safety, developing high-performance K-ion batteries (KIBs) is of great significance as an alternative to Li-ion batteries. High-energy-density MoSe2 has been identified as a promising anode material for KIBs; however, its electrochemical reversibility remains a big challenge. Herein, heterogenous MoSe2/N-doped carbon nanoarrays demonstrate a brilliant performance as KIBs anode materials. The as-formed hetero-interface weakens the K-Se bond of discharged products (K2Se), the length of K-Se bond is stretched by 3.9% with an enlargement of 19.2% in angle compared with pure K2Se, greatly promoting the regeneration of Mo-Se bond during charge. Moreover, the atomically inter-overlapping feature leads to an expanded MoSe2 interlayer distance of 1.20 nm that enables a much faster K-ion diffusion. Consequently, this nanoarray delivers an unprecedented K-ion storage performance, that is, a capacity of 402 mAh g(-1) at 0.2 A g(-1) over 200 cycles, and a long cycle life over 1000 cycles at 1.0 A g(-1) with 307 mAh g(-1) capacity retention.