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Vertically-aligned Mn(OH)2 nanosheet films for flexible all-solid-state electrochemical supercapacitors

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Abstract

The arrangement of the electrode materials is a significant contributor for constructing high performance supercapacitor. Here, vertically-aligned Mn(OH)2 nanosheet thin films were synthesized by cathodic electrodeposition technique on flexible Au coated polyethylene terephthalate substrates. Morphologies, microstructures, chemical compositions and valence state of the nanosheet films were characterized systematically. It shows that the nanosheets arranged vertically to the substrate, forming a porous nanowall structures and creating large open framework, which greatly facilitate the adsorption or diffusion of electrolyte ions for faradaic redox reaction. Electrochemical tests of the films show the specific capacitance as high as 240.2 F g−1 at 1.0 A g−1. The films were employed to assemble symmetric all-solid-state supercapacitors with LiCl/PVA gel severed as solid electrolyte. The solid devices exhibit high volumetric capacitance of 39.3 mF cm−3 at the current density 0.3 mA cm−3 with robust cycling stability. The superior performance is attributed to the vertically-aligned configuration.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 11104062), the Fundamental Research Funds for the Central Universities (Grant Nos. 2015B22313 and 2016B46014). Work at the Ames Laboratory was supported by the Department of Energy, Basic Energy Sciences, Division of Materials Sciences & Engineering, under Contract No. DE-AC02-07CH11358.

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Authors and Affiliations

  1. College of Science, Hohai University, Nanjing, 210098, People’s Republic of China

    Ziyuan Yang, Jiangfeng Gong, Chunmei Tang & Weihua Zhu

  2. College of mechanics and materials, Hohai University, Nanjing, 210098, People’s Republic of China

    Zhaojun Cheng, Jinghua Jiang & Aibin Ma

  3. Ames Laboratory, US DOE, Ames, IA, 50011, USA

    Qingping Ding

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  1. Ziyuan Yang
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  2. Jiangfeng Gong
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Correspondence to Jiangfeng Gong.

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Yang, Z., Gong, J., Tang, C. et al. Vertically-aligned Mn(OH)2 nanosheet films for flexible all-solid-state electrochemical supercapacitors. J Mater Sci: Mater Electron 28, 17533–17540 (2017). https://doi.org/10.1007/s10854-017-7689-5

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  • DOI: https://doi.org/10.1007/s10854-017-7689-5

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