Recently, Di Jiangtao, a researcher at the Suzhou Institute of Nanotechnology and Nanobionics of the Chinese Academy of Sciences, and others collaborated with Professor Ching-ping Wong of Georgia Institute of Technology to design and fabricate a three-dimensional array structure of zinc-doped copper oxide nanowires (Zn-CuO), which is electrochemical The active material MnO2 provides a conductive support to obtain a highly loaded MnO2 nanosheet material. The Zn-CuO@MnO2 material grown on the surface of the copper wire is used as the positive electrode material of the coaxial asymmetric fiber supercapacitor, and a high specific capacity and a wide operating voltage window are obtained. Coaxial asymmetric fiber-type devices have the advantages of small size, portability, and large working window, and are considered to have broad application prospects in the field of flexible wearable and miniature electronic devices in the future. However, at present, coaxial asymmetric fiber devices still have problems such as low energy density, electrode material and structural design limitations, which limit their further applications. Manganese dioxide has the characteristics of high theoretical capacity, low cost, low toxicity and environmental friendliness, and is considered an excellent electrochemically active material. However, the low conductivity and easy agglomeration of manganese dioxide materials have led to its limited specific capacity and power density. In order to solve the above problems, the researcher Li Qingwen team of Suzhou Institute of Nanotechnology and Ching-ping Wong team designed and prepared Zn-CuO@MnO2 nanowire array electrode; using Zn0.11CuO@MnO2 as the nuclear electrode (positive electrode), grown on carbon The VN nanowire array on the nanotube film is used as the negative electrode, and the coaxial asymmetric supercapacitor is assembled on the surface of the core electrode. Zn-CuO nanowires are grown in situ on the surface of copper wires by a one-step method to provide conductive support and deposition substrate for MnO2. The doping of Zn into the CuO lattice improves the conductivity of CuO, and improves the effective electron transport between the MnO2 nanosheets and the conductive substrate during the electrochemical reaction. Compared with other conductive stents, Zn-CuO nanowires contribute part of the capacity to the composite electrode. By doping with different contents of Zn, Zn0.11CuO nanowire materials with better conductivity and specific capacity are obtained. It can load MnO2 with a mass of 12.4 mg/cm2, which enables the electrode to obtain a high area specific capacity (4.26 F/cm2). The working voltage of the coaxial asymmetric device can reach 1.8 V, the specific capacity is 296.6 mF/cm2, and the energy density is 133.5 mWh/cm2 (power density is 0.9 mW/cm2). Compared with other coaxial asymmetric supercapacitors, the energy density and power density of the device prepared in this study are significantly better than other similar devices. To further verify its application in the field of wearable flexible devices, the researchers investigated the electrochemical stability of coaxial asymmetric supercapacitors under different bending conditions. The results show that under different bending conditions, the charge-discharge curve of the device does not change significantly, which indicates that it has better electrochemical stability and cycle stability under external force deformation. This kind of coaxial asymmetric supercapacitor can light up a small 2 V LED bulb and last 60 s. The publication of the research results provides further possibilities for the development of fiber-type energy storage devices in the field of flexible wearables. The related research results are titled Atomic Modulation 3D Conductive Frameworks Boosts Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors and published on Nano-Micro Letters. Assistant researcher and Ph.D. Wang Xiaona of Suzhou Institute of Nanotechnology is the first author of the paper, and Di Jiangtao, Li Qingwen, and Ching-ping Wong are the corresponding authors of the paper. Figure 1. (AF) Coaxial asymmetric supercapacitor preparation schematic. (G) Cross-sectional schematic diagram of coaxial asymmetric supercapacitor Figure 2. (AB) CuO, CuO@MnO2, Zn0.11CuO and Zn0.11CuO@MnO2 electrode electrochemical charge-discharge curves and graphs of specific capacity and voltage drop. (C) The relationship between MnO2 loading and deposition time. (DE) The relationship between area and mass specific capacity of Zn0.11CuO@MnO2 electrode at different MnO2 loadings. (F) Zn0.11CuO@MnO2 electrode cycle stability Figure 3. (A) Optical pictures of coaxial asymmetric supercapacitors in different bending states. (B) The charging and discharging curve of the coaxial asymmetric supercapacitor in the 1-3 bending state. (C) The charge-discharge cycle test of the device in the 90-degree bending state. (D) Coaxial asymmetric supercapacitors show potential application prospects in the field of portable wearables Tv Cabinet,Modern Tv Stand,Black Tv Stand,Tv Lift Cabinet Ningbo Oulin Import&Export Co.,Ltd. , https://www.oulinfurniture.com
