Abstract
Flexible and micro-sized energy conversion/ storage components are extremely demanding in portable and multifunctional electronic devices, especially those small, flexible, roll-up and even wearable ones. Here in this paper, a two-step electrochemical deposition method has been developed to coat Ni fibers with reduced graphene oxide and MnO2 subsequently, giving rise to Ni@reduced-graphene-oxide@MnO2 sheath-core flexible electrode with a high areal specific capacitance of 119.4 mF cm−2 at a current density of 0.5 mA cm−2 in 1 mol L−1 Na2SO4 electrolyte. Using polyvinyl alcohol (PVA)- LiCl as a solid state electrolyte, two Ni@reduced-grapheneoxide@ MnO2 flexible electrodes were assembled into a freestanding, lightweight, symmetrical fiber-shaped micro-supercapacitor device with a maximum areal capacitance of 26.9 mF cm−2. A high power density of 0.1W cm−3 could be obtained when the energy density was as high as 0.27 mW h cm−3. Moreover, the resulting micro-supercapacitor device also demonstrated good flexibility and high cyclic stability. The present work provides a simple, facile and low-cost method for the fabrication of flexible, lightweight and wearable energy conversion/storage micro-devices with a high-performance.
摘要
便携式及多功能电子设备的不断进步要求为其提供动力能量的存储与转换器件向尺寸小、柔性、能够卷曲甚至可穿戴方向发展. 本文采用两步电化学沉积法依次将还原氧化石墨烯(rGO)和MnO2沉积到镍纤维上得到Ni@rGO@MnO2壳核结构的柔性电极. 该电极在 1 mol L−1 Na2SO4 电解液中电流密度为0.5 mA cm−2时面积比电容为119.4 mF cm−2. 以PVA-LiCl为固态电解液, 将两根Ni@rGO@MnO2电 极组装成自支撑、质轻、对称的纤维状微型超级电容器, 最大面积比电容为26.9 mF cm−2, 能量密度高达0.1 W cm−3 (0.27 mW h cm−3). 此 外, 该微型超级电容器还展现了良好的柔性和循环性能. 这项研究工作主要提供了一种简单、易操作、低成本的制备柔性、质轻、可穿 戴的高性能能量存储设备的方法.
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Acknowledgements
This work was supported by the Ministry of Education of China (IRT1148), the National Natural Science Foundation of China (51772157 and 21173116), Synergistic Innovation Center for Organic Electronics and Information Displays, Jiangsu Province “Six Talent Peak” (2015-JY-015), Jiangsu Provincial Natural Science Foundation (BK20141424), the Program of Nanjing University of Posts and Telecommunications (NY214088), and the Open Research Fund of State Key Laboratory of Bioelectronics of Southeast University (I2015010).
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Jinhua Zhou received her MSc degree under the supervision of Prof. Xiaomiao Feng in the Department of Materials Chemistry at the Nanjing University of Posts and Telecommunications in 2016. She is currently a PhD under the supervision of Prof. Wenhua Hou at Nanjing University. Her research is mainly focused on the synthesis of 2D materials, and their application for energy conversion and storage devices.
Ningna Chen obtained her MSc degree from Nanjing University of Posts & Telecommunications in 2015. Currently, she is pursuing her PhD degree under the supervision of Prof. Wenhua Hou at Nanjing University. Her research is mainly focused on the synthesis of two-dimensional layered transition metal oxide nanomaterials, and their application for energy conversion and storage devices.
Xiaomiao Feng is a Professor in the Department of Materials Chemistry at the Nanjing University of Posts and Telecommunications. She received her PhD from Nanjing University, Nanjing (China) in 2007. Between July 2012 and July 2013 she joined the research group of Prof. J. Wang at the Department of Nanoengineering, University of California, San Diego as a visiting scholar. Her research interests include nanomaterials, naonomachines, biosensors and super capacitors.
Wenhua Hou is a professor in the School of Chemistry and Chemical Engineering at Nanjing University. He received his BS (1985) and PhD (1993) in chemistry from Nanjing University. He worked as visiting scholar at the State University of New York at Albany and University of California, San Diego. His research interests include the synthesis of 2D layer nanomaterials for potocatalysis and energy storage.
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Flexible All-solid-state Micro-supercapacitor based on Ni Fiber Electrode Coated with MnO2 and Reduced Graphene Oxide via Electrochemical Deposition
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Zhou, J., Chen, N., Ge, Y. et al. Flexible all-solid-state micro-supercapacitor based on Ni fiber electrode coated with MnO2 and reduced graphene oxide via electrochemical deposition. Sci. China Mater. 61, 243–253 (2018). https://doi.org/10.1007/s40843-017-9168-9
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DOI: https://doi.org/10.1007/s40843-017-9168-9