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Composite K2Mo4O13/α-MoO3 Nanorods: Sonochemical Preparation and Applications for Advanced Li+/Na+ Pseudocapacitance

Abstract

Proposal of pseudocapacitive material breaks the barriers between batteries and capacitors, making it possible to achieve balanced energy-power performance. However, limited reserve of lithium restricts the practical applications of pseudocapacitive materials in lithium-based systems; whereas sodium resources are abundant with the similar properties to lithium but lack of suitable pseudocapacitive materials. Exploitation of pseudocapacitive materials for Na+ storage is urgent. This paper reports a sonochemical approach, involving intercalation and ultrasonic exfoliation processes, for the first time to prepare composite K2Mo4O13/α-MoO3 (i.e., KMO) nanorods, and the possible applications of the KMO nanorods in Li+/Na+ pseudocapacitance are evaluated. The as-synthesized KMO possesses a uniform rod-like morphology formed by assembling nanoneedles (or nanobelts) with a large apparent aspect ratio of more than 10. Both in lithium ion batteries (LIBs) and sodium-ion batteries (SIBs), the KMO nanorods show efficient pseudocapacitance, which is not observed in the pristine MoO3-Na system. In SIBs, the as-synthesized KMO delivers a capacity of 895 mAh g-1 at 0.02 A g-1, much higher than that of the pristine MoO3-Na system. Also, it is found the b values of KMO (i=avb, current i and scan rate v in CV curves) are over 0.9 at potentials ranging from 1 V to 2 V in SIBs, indicating an obvious pseudocapacitive process. Benefiting from the layered K2Mo4O13 nanorods built with edge-shared distorted MoO6 octahedra, the Na+ ions with a larger size can be intercalated into the spaces between the double MoO6 plates. This sonochemical approach based on intercalation and exfoliation chemistry opens a new path to prepare molybdenum-based nanostructures for superior Li+/Na+ pseudocapacitance applications on a large scale in a low-carbon and environment-friendly manner.

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Publication details

The article was received on 09 Dec 2018, accepted on 29 Mar 2019 and first published on 01 Apr 2019


Article type: Communication
DOI: 10.1039/C8TA11854J
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Composite K2Mo4O13/α-MoO3 Nanorods: Sonochemical Preparation and Applications for Advanced Li+/Na+ Pseudocapacitance

    M. Hu, H. Jing, T. Li, J. Wang, H. Yang, R. Lv and D. Chen, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11854J

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