In this study, a flexible asymmetrical all-solid-state supercapacitor with high electrochemical performance was fabricated with Ni/MnO2-filter paper (FP) as the positive electrode and Ni/active carbon (AC)-filter paper as negative electrode, separated with poly(vinyl alcohol) (PVA)-Na2SO4 electrolyte. A simple procedure, such as electroless plating, was introduced to prepare the Ni/MnO2-FP electrode on the conventional laboratory FP, combined with the subsequent step of electrodeposition. Electrochemical results show that the as-prepared electrodes display outstanding areal specific capacitance (1900 mF/cm(2) at 5 mV/s) and excellent cycling performance (85.1% retention after 1000 cycles at 20 mA/cm(2)). Such a flexible supercapacitor assembled asymmetrically in the solid state exhibits a large volume energy density (0.78 mWh/cm(3)) and superior flexibility under different bending conditions. It has been demonstrated that the supercapacitors could be used as a power source to drive a 3 V light-emitting diode indicator. This study may provide an available method for designing and fabricating flexible supercapacitors with high performance in the application of wearable and portable electronics based on easily available materials.
Intelligent physiological monitoring devices in wearable sensor technology expected to meet the commercial requirements, including good at optical transparency, stability under mechanical toughness, and easy integration with self-powered systems. Herein, the construction of transparent, flexible, triboelectric-piezoelectric hybrid nanogenerator (TPHNG) reported using triboelectric-polydimethylsiloxane (PDMS), piezoelectric-polyvinylidene fluoride (PVDF) and welded silver nanowires (AgNWs) network served as the transparent conducting electrodes. The fabricated sandwich structure of TPHNG shows high transparency about 71% along with good flexibility. The fabricated TPHNG (2×3 cm 2 area) capable of delivering remarkable output peak voltage and current about 30 V, and 3 μA respectively with a prompt output power density of 57 mW m −2 for 5 N strike forces. The energy collected from the human physiological movement by TPHNG demonstrated to charge a commercial capacitor to 1.5 V within 100 s and also power an electronic watch. As a human physiology monitor, the TPHNG accomplished to detect the individual signals generated by body movements, including bending angle, bending frequency of the elbow, and even weak signal like human radial pulse. Moreover, the output performance of the fabricated TPHNG device remains stable upon twisting and bending over 1000 cycles reveals excellent stability. Assembly of outstanding transparency, flexibility, electrical output and sensing performance of TPHNG could be a promising candidate applied in energy conversation, individual healthcare monitoring, electronic skin, and a human-machine interface.
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