Manipulation of the MoO 2 /MoSe 2 Heterointerface Boosting High Rate and Durability for Sodium/Potassium Storage

作者：Jian Yu, Yun‐Dong Cao, Mingliang Wang, Linlin Fan, Wenguang Sun, Bin Qi, Yuxi Zhang, Xinyang Dong, Guang‐Gang Gao · 发表于：ACS Applied Materials & Interfaces · 年份：2022 · DOI：10.1021/acsami.2c08080 · 被引用次数：32 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Supercapacitor Materials and Fabrication

The main challenge for sodium/potassium ion storage is to find the suitable host materials to accommodate the larger-sized Na + /K + and conquer the sluggish chemical kinetics. Herein, by selenation of polyoxometalate in electrospinning fiber, a novel MoO 2 /MoSe 2 heterostructure embedded in one-dimensional (1D) N,P-doped carbon nanofiber (MoO 2 /MoSe 2 @NPC) is rationally constructed to show distinct enhancement of rate performance and cycle life for sodium ion batteries (SIBs) and potassium ion batteries (PIBs). The 1D skeleton of MoO 2 /MoSe 2 @NPC decreases the diffusion pathway of Na + /K +, and the doping of N/P heteroatoms in carbon fiber creates abundant active sites and provides good reachability for Na + /K + transportation. MoSe 2 nanosheets grow in the bulk phase of MoO 2 via in situ local phase transformation to achieve effective and firm heterointerfaces. Especially, the exposure extent of heterointerfaces can be controlled by treatment temperature during the preparation process, and the optimized heterointerfaces result in an ideal synergic effect between MoO 2 and MoSe 2 . DFT calculations confirm that the internal electric field in the heterogeneous interface guides the electron transfer from MoO 2 to MoSe 2, combined with strong adsorption capacity toward sodium/potassium, facilitating ion/electron transfer kinetics. It is confirmed that the MoO 2 /MoSe 2 @NPC anode for SIBs delivers 382 mA h g –1 under 0.1 A g –1 upon 200 cycles; meanwhile, a reversible ca...