In recent years, with the rapid development of flexible wearable electronics, the research and preparation of skin-type electronic devices has become one of the focuses in this field. In order to build an integrated electronic system, there is an urgent need for a flexible, ultra-thin, and lightweight skin-type energy storage device. As a new type of energy storage device, supercapacitors have attracted wide attention of researchers. However, the thickness of conventional thin film supercapacitors is generally more than 20 μm, which can not meet the practical requirements of flexible and skin electronics devices. In addition, most of such supercapacitors use metal current collectors and substrates. Since the current collectors are mostly brittle materials, the cost is high, and the devices must adhere to the substrate, and large angle bends cannot be achieved, so existing devices are difficult to apply to flexible devices. Portable electronics, especially in the field of skin electronics. Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics (CIC) Advanced Materials and Structure Analysis Laboratory “Nanomaterials and Mesoscopic Physics†research group has been researching the preparation, properties, and applications of carbon nanostructures for many years. In recent years, a series of achievements have been made in the field of carbon nanomaterial-based flexible energy storage devices (Energ. Environ. Sci. 2012, 5, 8726; Adv. Mater. 2013, 25, 1058; Nano Res. 2014, 7, 1680; Adv Energy Mater. 2015, 5, 1500677; Nanoscale 2015, 7, 12492). Recently, the research group graduates Mou Pingshan, Zhang Nan, and Zhang Qiang, under the guidance of academician Chi Sishen of the Chinese Academy of Sciences and researcher Zhou Wei, collaborated with Professor Niu Zhiqiang and others from the College of Chemistry of Nankai University to develop a flexible, ultra-thin, self-supporting, high-performance skin. Super capacitor. His research work entitled Epidermal supercapacitor with high performance was published in the magazine "Advanced Functional Materials, 2016, 26, 8178-8184" and was selected as the cover article. They used a directly grown carbon nanotube film to be composited with PEDOT and optimized their loading and electrochemical performance. Thanks to the continuous network structure composed of a large number of "Y-junctions", the composite film has a conductivity of up to ~1600 S cm-1 and mechanical strength of ~300 MPa, which contributes to the construction of skin-like devices (Fig. 1). A step-by-step separation technique based on the difference in surface energy of the substrate is proposed to realize the non-destructive separation of the device and the substrate, and an ultra-thin device having a thickness of about 1 μm is constructed ( FIG. 2 ). Tested, this skin-type supercapacitor has a specific capacitance of 56 F g-1 (relative to both electrode masses), an energy density of 6.0 W h kg-1, a power density of 332 kW kg-1, and a response time of 5.4 ms. In addition, the device can tolerate 105 times of bending. Compared with other thin-film devices, the skin-type supercapacitor shows significant advantages in specific capacitance, power density, and response time (Fig. 3). It is expected to be used in areas such as flexible wearable electronics and dermatology (Figure 4). Related research has been supported by the Ministry of Science and Technology, the National Natural Science Foundation of China, and the Chinese Academy of Sciences.
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