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    Calligraphy-Inspired Brush Written Foldable Supercapacitors

    Year: 2017

    Journal: Nano Energy, Volume 38, AUG, page 429–437

    Authors: Li, Jiahui; Shao, Yuanlong; Shi, Qiuwei; Hou, Chengyi; Zhang, Qinghong; Li, Yaogang; Kaner, Richard B.; Wang, Hongzhi

    Organizations: Natural Science Foundation of China [51603037, 51672043]; Natural Science Foundation of Shanghai [15ZR1401200, 16ZR1401500]; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning; Program of Shanghai Academic Research Leader [16XD1400100]; Science and Technology Commission of Shanghai Municipality [16JC1400700]; Program of Introducing Talents of Discipline to Universities [111-2-04]; Innovative Research Team in University [IRT_16R13]; Shanghai ChenGuang Program [15CG33]; Shanghai Sailing Program [16YF1400400]; Donghua University doctoral Innovation Fund Program [17D310606]

    Keywords: Calligraphy; graphene; thin film fabrication; supercapacitors

    Chinese brush, made of a bundle of animal hairs in a quasi-parallel arrangement, is an effective tool that can be used to continuously place low-viscosity ink onto different substrates with high ink mass loading. Here, we demonstrate a highly effective approach to coat graphene onto rough and even crumpled substrates by using a Chinese brush. By combining forces including Laplace pressure differential, asymmetric retention and gravity, the low-viscosity graphene oxide ink can be sufficiently transferred onto different substrates through the brush hairs in a controlled manner. The as-prepared graphene films are used as electrodes for all-solid-state foldable supercapacitors. Using series and/or parallel connections, the energy storage performance of the foldable all-solid-state supercapacitors can be tailored to provide different output voltages and currents. The voltage of the three series connected devices with gel electrolyte can be extended to 2.4 V. A parallel connected foldable all-solid-state supercapacitor exhibits promising electrochemical performance, such as high areal capacitance of 258.6 mF cm(-2), good energy density of 23.1 mu Wh cm(-2) and power density of 0.2 mW cm(-2). This work offers an alternative method of GO ink transfer, graphene film production and the fabrication of flexible electronics. Graphical abstract We demonstrate a highly effective approach to coating graphene films onto rough or even crumpled substrates by using a Chinese brush. The produced graphene films are used as electrodes for all-solid-state foldable supercapacitors. By making series or parallel connections, the energy storage performance of the all-solid-state foldable supercapacitors can be adjusted to different output voltages and currents. [GRAPHICS] .
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