J. Mater. Sci. Technol. ›› 2023, Vol. 143: 107-116.DOI: 10.1016/j.jmst.2022.10.011

• Research Article • Previous Articles     Next Articles

Highly active and stable Cu9S5-MoS2 heterostructures nanocages enabled by dual-functional Cu electrocatalyst with enhanced potassium storage

Bao Zhanga, Baohe Xua, Haozhe Qina, Liang Caob,*, Xing Oua,*   

  1. aEngineering Research Center of the Ministry of Education for Advanced Battery Materials, School of Metallurgy and Environment, Central South University, Changsha 410083, China
    bSchool of Materials Engineering, Changshu Institute of Technology, Changshu 215500, China
  • Received:2022-08-03 Revised:2022-08-03 Accepted:2022-08-03 Online:2023-04-14
  • Contact: *E-mail addresses: liangcao@cslg.edu.cn (L. Cao), ouxing@csu.edu.cn (X. Ou).

Abstract: The intrinsic poor electrical conductivity, severe dissolution of KxSy intermediates, and inferior conversion reaction reversibility extremely impede the practical application of the transition-metal chalcogenides (TMDs) anode for potassium-ion batteries (PIBs). Herein, a rationally designed Cu9S5/MoS2/C heterostructure hollow nanocage was synthesized with assistance from metal-organic frameworks (MOFs) precursor. During the K-storage process, the homogeneously distributed the sulfiphilic nature of Cu0 reaction product could act as a dual-functional catalyst, not only facilitating the rapid charge transfer but also effectively anchoring (KxSy) polysulfides, thus boosting K-storage reactions reversibility during the conversion reaction process. When applied as an anode for PIBs, the as-prepared heterostructure exhibits excellent reversible capacity and long cycle lifespan (350.5 mAh g-1 at 0.1 A g-1 and 0.04% per cycle capacity decay at 1 A g-1 after 1000 cycles). Additionally, the potassium storage mechanism is distinctly revealed by in-situ characterizations. The nanoarchitecture designing strategy for the advanced electrode in this work could provide vital guidance for relevant energy storage materials.

Key words: Nanocage hollow structure, Metal-organic frameworks, Cu9S5/MoS2/C heterostructure, Dual-functional catalyst, Potassium-ion batteries