Issue 22, 2015

Porous hollow carbon spheres decorated with molybdenum diselenide nanosheets as anodes for highly reversible lithium and sodium storage

Abstract

Porous hollow carbon spheres (PHCS) decorated with MoSe2 nanosheets (MoSe2@ PHCS) are synthesized via a three-step process. Uniform and conformal MoSe2 nanosheets are firmly attached to PHCS according to the characterization of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption/desorption measurements. Enhanced electrochemical performance of MoSe2@PHCS is investigated in lithium-ion and sodium-ion storage. The MoSe2@PHCS deliver a reversible lithium storage capacity of 681 mA h g−1 for 100 discharge/charge cycles. In Na-ion batteries, it manifests a reversible sodium capacity of 580 mA h g−1 after 100 cycles. Three synergic effects can be attributed to the enhanced electrochemical performance of MoSe2@PHCS: (1) both the sheet structure of the MoSe2 and the mechanically robust carbon sphere supporter can accommodate stress from cycling; (2) the porous hollow carbon spheres matrix in the MoSe2@PHCS offers a beneficial conductivity environment; (3) uniform and conformal MoSe2 nanosheets attachment shortens the electronic lithium-ion and sodium-ion pathway during cycling. The MoSe2@PHCS have a great potential as an anode for lithium and sodium batteries.

Graphical abstract: Porous hollow carbon spheres decorated with molybdenum diselenide nanosheets as anodes for highly reversible lithium and sodium storage

Supplementary files

Article information

Article type
Paper
Submitted
25 Mar 2015
Accepted
04 May 2015
First published
05 May 2015

Nanoscale, 2015,7, 10198-10203

Porous hollow carbon spheres decorated with molybdenum diselenide nanosheets as anodes for highly reversible lithium and sodium storage

X. Yang, Z. Zhang, Y. Fu and Q. Li, Nanoscale, 2015, 7, 10198 DOI: 10.1039/C5NR01909E

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