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Recently, Wu Zhongshuai, a researcher of the two-dimensional materials and energy device research group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, teamed up with Ren Wencai, a researcher of the Institute of Metal Research of the Chinese Academy of Sciences, to assist the one-step filtration method to prepare a two-dimensional laminated structure. Black phosphene and graphene composite microelectrode. The electrode can be directly transferred to a flexible substrate as a planar supercapacitor, exhibiting excellent energy density and good mechanical flexibility in ionic liquids. Related research results were published in the ACS Nano (DOI: 0.1021/acsnano.7b03288).
The rapid development of wearable and portable electronic products has greatly promoted the modern society's demand for high energy density, lightweight, portable, and flexible energy storage devices. Planar supercapacitors are considered to be important micro-power storage devices in integrated electronic devices due to their advantages of thinness, small size, high power density, long cycle life and so on. However, in the past, the preparation process of planarized miniaturized capacitors was complicated, and it often required the use of relatively harsh technical means such as photolithography and plasma etching. Therefore, a simple and efficient preparation of high performance planar miniaturized supercapacitors was developed. The method is very necessary.
Recently, the research team used highly conductive graphene nanosheets and high-capacity black phosphene nanosheets as electrode materials. With the help of parallel cross-templates, a highly-conductive graphite with a laminated structure was constructed by a simple one-step filtration method. The ene/black phosphene-patterned composite microelectrode was applied to a planar supercapacitor and showed high operating voltage (3V) and energy density (11.6mWh/cm3) in the ionic liquid. In addition, the planar supercapacitor still maintains good performance in a highly curved state. This device processing strategy is not only simple and easy, but also does not need to join the conventional metal current collector, internal interconnection or contact body in the device preparation process, can build modular devices, and then obtain high capacity and output voltage.
The above work was supported by the National Natural Science Foundation of China, the National Key R&D Program, the National Youth 1000-Year Plan, the Natural Science Foundation of Liaoning Province, and the Postdoctoral Fund.
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