Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.



Exploration of the Sodium Ion Ordered Transfer Mechanism in MoSe2@Graphene Composite for Superior Rate and Lifespan Performance

Abstract

Two-dimensional structured materials attracted much attention and commonly employed as active materials for sodium ion batteries owing to their inherent advantages. The reaction mechanisms behind sodium ion storage and diffusion pathways in a composite of MoSe2@graphene were monitored and explored by the in-situ synchrotron technique. Based on nanocages in the MoSe2 structure and efficient sodium ion pre-location on the extensive surfaces of graphene, the combination of a sodium ion storage mechanism and an ordered transfer mechanism is proposed in different voltage windows. First, numerous sodium ions pre-located on the surface by an adsorption reaction. In the second step, all the pre-located sodium ions are immediately inserted into MoSe2 nanosheets, which corresponds to the intercalation reaction mechanism. In the final step, the intercalated sodium ions will undergo a conversion reaction with MoSe2. Meanwhile, numerous nanocages resulting from sufficient deficiency of MoSe2 and layer dislocation will be beneficial to the capacity enhancement and rate capability. The prior adsorption reaction can efficiently improve the rate capability as well. Benefitting from these merits, the composite exhibits a high specific capacity of 640 mAh g-1 and robust rate performance. The cycling lifetime is also increased as well, with capacity retention of ~ 85% over 1000 cycles at a current density of 1.0 A g-1. Therefore, this composite shows a promising potential for application in future sodium ion batteries.

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Mar 2019, accepted on 15 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TA03108A
J. Mater. Chem. A, 2019, Accepted Manuscript

  •   Request permissions

    Exploration of the Sodium Ion Ordered Transfer Mechanism in MoSe2@Graphene Composite for Superior Rate and Lifespan Performance

    H. Fan, Q. Zhang, Q. Gu, Y. Li, W. Luo and H. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03108A

Search articles by author

Spotlight

Advertisements