Controlled synthesis of MnSn(OH){sub 6}/graphene nanocomposites and their electrochemical properties as capacitive materials

Journal Article · Sun Jan 15 00:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.11.015· OSTI ID:21612868

Gongkai, Wang ^[1]; Xiang, Sun; Fengyuan, Lu ^[2]; Qingkai, Yu ^[3]; Changsheng, Liu ^[1]

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1. Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, Northeastern University, Shenyang, Liaoning 110004 (China)
2. Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180 (United States)
3. Department of Electrical Engineering, Texas State University, San Marcos, TX 78666 (United States)

We report the synthesis of novel MnSn(OH){sub 6}/graphene nanocomposites produced by a co-precipitation method and their potential application for electrochemical energy storage. The hydroxide decorated graphene nanocomposites display better performance over pure MnSn(OH){sub 6} nanoparticles because the graphene sheets act as conductive bridges improving the ionic and electronic transport. The crystallinity of MnSn(OH){sub 6} nanoparticles deposited on the surface of graphene sheets also impacts the capacitive properties as electrodes. The maximum capacitance of 31.2 F/g (59.4 F/g based on the mass of MnSn(OH){sub 6} nanoparticles) was achieved for the sample with a low degree of crystallinity. No significant degradation of capacitance occurred after 500 cycles at a current density of 1.5 A/g in 1 M Na{sub 2}SO{sub 4} aqueous solution, indicating an excellent electrochemical stability. The results serve as an example demonstrating the potential of integrating highly conductive graphene networks into binary metal hydroxide in improving the performance of active electrode materials for electrochemical energy storage applications. - Graphical abstract: Graphite oxide (GO) can be synthesized by oxidizing graphite using Hummers method. Graphene was reduced from GO by thermal exfoliation. In this work, MnSn(OH){sub 6}/graphene nano-composites were synthesized by a simple co-precipitation method and their electrochemical performances have been explored. Highlights: Black-Right-Pointing-Pointer Noval MnSn(OH){sub 6}/graphene nano-composites were synthesized. Black-Right-Pointing-Pointer Microstructure can be tailored by changing the reaction temperature and time. Black-Right-Pointing-Pointer Crystallinity of MnSn(OH){sub 6} nanoparticles impacts capacitive properties as electrode. Black-Right-Pointing-Pointer Nano-composites display improved electrochemical performance over MnSn(OH){sub 6} alone. Black-Right-Pointing-Pointer Results serve as an example demonstrating the potential for energy storage.

• OSTI ID: 21612868
• Journal Information: Journal of Solid State Chemistry, Vol. 185; Other Information: DOI: 10.1016/j.jssc.2011.11.015; PII: S0022-4596(11)00618-9; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

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37 INORGANIC
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PHYSICAL AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
CAPACITANCE
COMPOSITE MATERIALS
ELECTROCHEMISTRY
ELECTRODES
ENERGY STORAGE
GRAPHITE
MICROSTRUCTURE
NANOSTRUCTURES
OXIDES
SODIUM SULFATES
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ALKALI METAL COMPOUNDS
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ELECTRICAL PROPERTIES
ELEMENTS
HOMOGENEOUS MIXTURES
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