Zhengchun Yang

Facile Synthesis of MoS2/Reduced Graphene Oxide@Polyaniline for High-Performance Supercapacitors.

The molybdenum disulfide/reduced graphene oxide@polyaniline (MoS2/RGO@PANI) was facilely and effectively prepared through a two-stage synthetic method including hydrothermal and polymerized reactions. The rational combination of two components allowed polyaniline (PANI) to uniformly cover the outer face of molybdenum disulfide/reduced graphene oxide (MoS2/RGO). The interaction between the two initial electrode materials produced a synergistic effect and resulted in outstanding energy storage performance in terms of greatest capacitive property (1224 F g(-1) at 1 A g(-1)), good rate (721 F g(-1) at 20 A g(-1)), and cyclic performance (82.5% remaining content after 3000 loops). The symmetric cell with MoS2/RGO@PANI had a good capacitive property (160 F g(-1) at 1 A g(-1)) and energy and power density (22.3 W h kg (-1) and 5.08 kW kg(-1)).

Highly Flexible Resistive Switching Memory Based on the Electronic Switching Mechanism in the Al/TiO2/Al/Polyimide Structure

A highly flexible resistive switching (RS) memory was fabricated in the Al/TiO2/Al/polyimide structure using a simple and cost-effective method. An electronic-resistive-switching-based flexible memory with high performance that can withstand a bending strain of up to 3.6% was obtained. The RS properties showed no obvious degradation even after the bending tests that were conducted up to 10u202f000 times, and over 4000 writing/erasing cycles were confirmed at the maximally bent state. The superior electrical properties against the mechanical stress of the device can be ascribed to the electronic RS mechanism related to electron trapping/detrapping, which can prevent the inevitable degradation in the case of the RS related with the ionic defects.

Sensitive and wearable carbon nanotubes/carbon black strain sensors with wide linear ranges for human motion monitoring

Strain sensors have increasingly played an important role in the field of wearable devices for monitoring human motions. In this paper, we develop a flexible and wearable strain sensor composed of carbon nanotubes (CNTs) and carbon black (CB) on the stretchable spandex yarn. The sensor was fabricated though a layer-by-layer assembly method, respectively coating CNTs and CB on the yarn, which is simple, low-cost, solution-processable. Compared with reported strain sensors, the materials of the sensors are quite cheap and the manufacturing process is relatively simple. Fortunately, the sensors show perfect properties, such as high sensitivity (gauge factor, GF up to 45.4), super stretchability of 150%, and excellent linearity with large linear ranges (the strain range 15–150%). On the basis of the outstanding performance of the sensors, we successfully tested the finger bending and wrist pulse beating, proving that the sensors are potential in monitoring human movement.

One-pot synthesis of graphite/MnO 2 hybrids and electrochemical supercapacitor performance on different substrates

A facile method was applied to prepare manganese dioxide nanostructures grown on graphite sheets (G/MnO2). The morphology and component analysis shows that the manganese dioxide porous structures are successfully arranged in a close and orderly arrangement on the graphite sheet. The products have good capacitance performance due to the high electrical conductivity and large specific surface area. Both electrodes were obtained by coating on carbon and indium tin oxide substrates. The results of electrochemical performance of the electrodes on carbon substrate show excellent specific capacitance of 313xa0mF/cm2. This in-situ preparation method of the hybrids demonstrates an effective way to obtain excellent electrochemical properties. Therefore, the comprehensive study of the different substrates provides a reference application in the development of supercapacitors.

Plasma assisted fabrication of multi-layer graphene/nickel hybrid film as enhanced micro-supercapacitor electrodes

A facile synthesis strategy has been developed for fabricating multi-layer graphene/nickel hybrid film as micro-supercapacitor electrodes by using plasma enhanced chemical vapor deposition. The as-presented method is advantageous for rapid graphene growth at relatively low temperature of 650 °C. In addition, after pre-treating for the as-deposited nickel film by using argon plasma bombardment, the surface-to-volume ratio of graphene film on the treated nickel substrate is effectively increased by the increasing of surface roughness. This is demonstrated by the characterization results from transmission electron microscopy, scanning electron microscope and atomic force microscopy. Moreover, the electrochemical performance of the resultant graphene/nickel hybrid film as micro-supercapacitor working electrode was investigated by cyclic voltammetry and galvanostatic charge/discharge measurements. It was found that the increase of the surface-to-volume ratio of graphene/nickel hybrid film improved the specific capacitance of 10 times as the working electrode of micro-supercapacitor. Finally, by using comb columnar shadow mask pattern, the micro-supercapacitor full cell device was fabricated. The electrochemical performance measurements of the micro-supercapacitor devices indicate that the method presented in this study provides an effective way to fabricate micro-supercapacitor device with enhanced energy storage property.