Research Article


2018, 11(4): 2083–2092


MoS2/MnO2 heterostructured nanodevices for electrochemical energy storage

Xiaobin Liao1, Yunlong Zhao1,2, Junhui Wang1, Wei Yang1, Lin Xu1, Xiaocong Tian1, Yi Shuang1, Kwadwo Asare Owusu1, Mengyu Yan1 (*), and Liqiang Mai1,3 (*)

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1 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2 Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
3 Department of Chemistry, University of California, Berkeley, California 94720, USA

Keywords: energy storage, nanoscale device, heterostructure, electrochemical performance, electrical transport
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ABSTRACT Hybrid or composite heterostructured electrode materials have been widely studied for their potential application in electrochemical energy storage. Whereas their physical or chemical properties could be affected significantly by modulating the heterogeneous interface, the underlying mechanisms are not yet fully understood. In this work, we fabricated an electrochemical energy storage device with a MoS2 nanosheet/MnO2 nanowire heterostructure and designed two charge/discharge channels to study the effect of the heterogeneous interface on the energy storage performances. Electrochemical measurements show that a capacity improvement of over 50% is achieved when the metal current collector was in contact with the MnO2 instead of the MoS2 side. We propose that this enhancement is due to the unidirectional conductivity of the MoS2/MnO2 heterogeneous interface, resulting from the unimpeded electrical transport in the MnO2-MoS2 channel along with the blocking effect on the electron transport in the MoS2-MnO2 channel, which leads to reaction kinetics optimization. The present study thus provides important insights that will improve our understanding of heterostructured electrode materials for electrochemical energy storage.
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MoS2/MnO2 heterostructured nanodevices for electrochemical energy storage. Nano Res. 2018, 11(4): 2083–2092

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