Van der Waals heterostructure engineering by 2D space-confinement for advanced potassium-ion storage
作者机构：National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous MetalsSchool of Metallurgy and EnvironmentCentral South UniversityChangsha410083China Key Laboratory on Fuel Cell Technology of Guangdong ProvinceSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou510641China Institute of Advanced Magnetic MaterialsCollege of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou310018China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2021年第14卷第11期
页 面：3854-3863页
核心收录：
基 金：This work was financially supported by the National Natural Science Foundation of China(Nos.51902347,51822812,51772334,and 51778627) Natural Science Foundation of Hunan Province(No.2020JJ5741)
主 题：van der Waals heterostructure space confinement molybdenum disulfide anode materials potassium-ion batteries
摘 要：Molybdenum disulfide (MoS_(2)) has received enormous attentions in the electrochemical energy storage due to its unique two-dimensional layered structure and relatively high reversible capacity. However, the application of MoS_(2) in potassium-ion batteries (PIBs) is restricted by poor rate capability and cyclability, which are associated with the sluggish reaction kinetics and the huge volume expansion during K+ intercalation. Herein, we propose a two-dimensional (2D) space confined strategy to construct van der Waals heterostructure for superior PIB anode, in which the MoS_(2) nanosheets can be well dispersed on reduced graphene oxide nanosheets by leveraging the confinement effect within the graphene layers and amorphous carbon. The strong synergistic effects in 2D van der Waals heterostructure can extremely promote the electron transportation and ions diffusion during K+ insertion/extraction. More significantly, the 2D space-confinement effect and van der Waals force inhibit polysulfide conversion product dissolution into the electrolyte, which significantly strengthens the structural durability during the long-term cycling process. As anticipated, the as-synthesized the “face-to-face C/MoS_(2)/G anode delivers remarkable K-storage performance, especially for high reversible capacity (362.5 mAh·g^(-1) at 0.1 A·g^(-1)), excellent rate capability (195.4 mAh·g^(-1) at 10 Ag^(-1)) and superior ultrahigh-rate long-cycling stability (126.4 mAh·g^(-1) after 4000 cycles at high rate of 5 A·g^(-1)). This work presents a promise strategy of structure designing and composition optimization for 2D layered materials in advanced energy storage application.
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