Heterojunction and vacancy engineering strategies and dual carbon modification of MoSe2-x@CoSe2-C /GR for high-performance sodium-ion batteries and hybrid capacitors

Wentao Guo; Jiaming Zhu; Yingying Wang; Gang Wang; Hui Wang; Guanghui Yuan; Hongtao Xue; Yuan Xia; Beibei Wang

doi:10.1016/j.jcis.2024.11.103

Heterojunction and vacancy engineering strategies and dual carbon modification of MoSe_2-x@CoSe₂-C /GR for high-performance sodium-ion batteries and hybrid capacitors

J Colloid Interface Sci. 2024 Nov 20;680(Pt B):651-665. doi: 10.1016/j.jcis.2024.11.103. Online ahead of print.

Authors

Wentao Guo¹, Jiaming Zhu¹, Yingying Wang², Gang Wang¹, Hui Wang³, Guanghui Yuan⁴, Hongtao Xue⁵, Yuan Xia⁶, Beibei Wang⁷

Affiliations

¹ State Key Laboratory of Photon-Technology in Western China Energy, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710127, Shannxi, China.
² School of Foreign Languages, XiDian University, Xi'an 710126, China.
³ College of Chemistry & Materials Science, Northwest University, Xi'an 710127, Shannxi, China.
⁴ Ankang University, Ankang 725000, Shannxi, China.
⁵ Ankang Shunxiang Carbon Co., Ltd., Ankang 725100, China.
⁶ Xi'an Shiyou University, Xi'an 710065, China. Electronic address: xiayuan@xsyu.edu.cn.
⁷ State Key Laboratory of Photon-Technology in Western China Energy, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710127, Shannxi, China. Electronic address: beibeiwang@nwu.edu.cn.

PMID: 39579431
DOI: 10.1016/j.jcis.2024.11.103

Abstract

Sodium-ion batteries (SIBs) and hybrid capacitors (SIHCs) have great potential in related electrochemical energy storage fields. However, the inferior cycling performance and sluggish kinetics of Na⁺ transport in conventional anodes continue to impede their practical applications. Here, we propose a refined design by utilizing well-organized MoSe₂ nanorods as precursors and introducing a metal-organic framework and graphene (GR), while resulting in the formation of bimetallic selenide heterostructures/carbon MoSe_2-x@CoSe₂-C/GR (MCCR) composite through electronegativity. The MoSe_2-x/CoSe₂ heterostructure can spontaneously form the built-in electric field to accelerate the charge transport, and the formation of anionic Se vacancies induced by electronegativity in situ can provide more active sites for enhancing sodium storage. The presence of external carbon and graphene can act as buffer layers to suppress the volume expansion of MoSe_2-x/CoSe₂ heterogeneous, and on the other hand, form a conductive network externally to improve electrode conductivity. As anticipated, the MCCR electrode demonstrates superior reversible specific capacity (446 mAh g^-1 after 100 cycles) and substantial pseudocapacitance contribution, excellent rate performance in SIB half and full cells. In addition, system electrochemical analysis of multiple ex-situ characterizations elucidates the electrochemical reaction kinetics and transformation mechanism of MCCR electrodes during charging and discharging in depth. When coupled with activated carbon (AC), the MCCR//AC SIHC full hybrid capacitors exhibit impressive cycling stability over 2500 cycles at 1 A g^-1 and excellent rate performance, demonstrating their widespread application in energy storage.

Keywords: Electrochemical analysis; Heterostructure; Selenium vacancy; Sodium-ion battery; Sodium-ion hybrid capacitors.