Nano-sized MoO2 spheres interspersed three-dimensional porous carbon composite as advanced anode for reversible sodium/potassium ion storage

Recently, MoO2 has been widely studied as an anode material owing to its high theoretical capacity and stability. In this study, nano-sized MoO2 is successfully fabricated on three-dimensional porous carbon (3DPC) using a simple hydrothermal method followed by calcination. The composite exhibits hig...

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Bibliographic Details
Published in:Electrochimica acta 2019-06, Vol.307, p.293-301
Main Authors: Bao, Shuo, Luo, Shao-hua, Yan, Sheng-xue, Wang, Zhi-yuan, Wang, Qing, Feng, Jian, Wang, Ying-ling, Yi, Ting-feng
Format: Article
Language:English
Subjects:
Batteries
Carbon
Composite material
Dimensionally stable anodes
Electrical resistivity
Electrochemical analysis
Electrode materials
Ion storage
Molybdenum oxides
MoO2 spheres
Potassium
Potassium ion batteries
Sodium
Sodium ion batteries
Synergistic effect
Three dimensional composites
Three-dimensional porous carbon
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Summary:Recently, MoO2 has been widely studied as an anode material owing to its high theoretical capacity and stability. In this study, nano-sized MoO2 is successfully fabricated on three-dimensional porous carbon (3DPC) using a simple hydrothermal method followed by calcination. The composite exhibits higher surface area (171.6 m2 g−1) than that of bulk MoO2 (81.4 m2 g−1). For the first time, the novel MoO2/3DPC composite is tested in both sodium and potassium ion batteries. The MoO2/3DPC composite exhibits improved electrochemical performance than that of bulk MoO2 powder. In Na+ half cells, the specific charge capacity in the first cycle of the MoO2/3DPC composite at 0.1 A g−1 is ∼463 mAh g−1 and a reversible capacity of ∼367 mAh g−1 can be maintained after 200 cycles. In K+ half cells, the initial charge capacity is ∼350 mAh g−1 at 0.05 A g−1. In addition, a reversible charge capacity of as high as 213 mAh g−1 can be maintained after 200 cycles. The synergistic effect of 3DPC and nano-sized MoO2 improves the electrochemical performance. The unique 3D structure of porous carbon can increase the electrical conductivity and alleviate the absolute stress/strain. Results demonstrate that the MoO2/3DPC composite is one of the promising candidates for Na+/K+ storage.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.03.216