Nanocellulose based flexible and highly conductive film and its application in supercapacitors
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ORIGINAL RESEARCH
Nanocellulose based flexible and highly conductive film and its application in supercapacitors Minjie Hou . Yumeng Hu . Miaojun Xu . Bin Li
Received: 16 April 2020 / Accepted: 27 August 2020 Ó Springer Nature B.V. 2020
Abstract A novel conductive film with a sandwich structure was successfully prepared from nanofibrillated cellulose (NFC) and carbon nanotubes (CNTs). This film possessed an anisotropic electrical conductivity, and its electrical conductivity and mechanical strength were significantly enhanced. The electrical conductivity of the film was as high as 90.8 S cm-1 and the tensile strength was 60.8 MPa when the CNT loading amount was 19.2 wt%. Based on this unique structure, this flexible conductive film was used to prepare an all-in-one integrated film supercapacitor (IFSC) though a simple electrodeposition method. After the liquid electrolyte penetrated into the composite film, the flexible IFSC possessed a high volumetric capacitance of 11.25 F cm-3 and retained stable electrochemical performance under different bending states. Therefore, we believed that the flexible and simply designed NFC based film was a promising
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03420-2) contains supplementary material, which is available to authorized users. M. Hou Y. Hu M. Xu B. Li (&) Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, P. R. China e-mail: [email protected]
candidate for the application in wearable bioelectronics. Keywords Conductive film Nanocellulose Carbon nanotube Sandwich structure Integrated supercapacitor
Introduction With the rapid development of wearable electronics, energy storage devices with high flexibility, light weight and good electrochemical properties has attracted tremendous attention (Wang et al. 2017; Bai et al. 2019). Among numerous flexible energy storage devices, flexible supercapacitors are regarded as the optimal candidate due to their high power density, fast charge/discharge rate, excellent cycling stability, and low maintenance cost (Cong et al. 2013; Fang et al. 2012; Zhong et al. 2015; Wang et al. 2014). Recently, substantial effort has been devoted to endow flexible supercapacitors with more efficiency, more stability, and low cost in order to develop fully flexible electronics (Su et al. 2018; Rose et al. 2018; Shao et al. 2015; Zhu et al. 2020). Nanofibrillated cellulose (NFC) is considered excellent material for preparing flexible supercapacitors (Ma et al. 2016a, b; Kang et al. 2012; Ma et al. 2016a, b). The unique structure of NFC, with high
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strength and high aspect ratio, make them ideal building blocks for the preparation of electrode materials (Zhang et al. 2019; Chen and Hu 2018; Wang et al. 2020), it also can be utilized to develop flexible and s
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