Hydrothermal synthesis and electrochemical performance of MnO 2 /graphene/polyester composite electrode materials for flexible supercapacitors

2016 ◽  
Vol 209 ◽  
pp. 486-497 ◽  
Author(s):  
Mei-Xia Guo ◽  
Shao-Wei Bian ◽  
Fu Shao ◽  
Si Liu ◽  
Yi-Hang Peng
Keyword(s):  
Hydrothermal Synthesis ◽  
Electrochemical Performance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Flexible Supercapacitors ◽  
Polyester Composite

Characterisation of Ti-Al and Ti-Cu Laminated Composite Electrode Materials

2011 ◽  
Vol 194-196 ◽  
pp. 1667-1671
Author(s):  
Jian Xu ◽  
Pei Xian Zhu ◽  
Hui Yu Ma ◽  
Sheng Gang Zhou
Keyword(s):  
Electrochemical Performance ◽  
Current Distribution ◽  
Electrode Surface ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Laminated Composites ◽  
Matrix Material ◽  
Laminated Composite ◽  
The Difference ◽  
Electrode Matrix

We proposed using Ti-Al and Ti-Cu laminated composites instead of single Ti electrode metals, as well as studied the difference in performance between laminated composite electrode materials and pure-Ti electrode. The analysis of the conductivity and electrochemical performance of electrode matrix material indicates the result that the improvement of matrix material by using Ti-Al and Ti-Cu laminated composites, better performance for conductivity of electrode, and be beneficial to homogenize the electrode surface potential and current distribution and promote electrocatalytic activity between polar plates. Whereas comparison between Ti-Al and Ti-Cu laminated composites, Ti-Cu laminated composites is better in performance.

scholarly journals Fabrication and Performance of Self-Supported Flexible Cellulose Nanofibrils/Reduced Graphene Oxide Supercapacitor Electrode Materials

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2793 ◽  
Author(s):  
Wen He ◽  
Bo Wu ◽  
Mengting Lu ◽  
Ze Li ◽  
Han Qiang
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Retention Rate ◽  
Rapid Development ◽  
Cellulose Nanofibrils ◽  
Flexible Supercapacitors ◽  
Reduced Graphene

With the rapid development of portable and wearable electronic devices, self-supporting flexible supercapacitors have attracted much attention, and higher requirements have been put forward for the electrode of the device, that is, it is necessary to have good mechanical properties while satisfying excellent electrochemical performance. In this work, a facile method was invented to obtain excellent self-supported flexible electrode materials with high mechanical properties and outstanding electrochemical performance by combining cellulose nanofibrils (CNFs) and reduced graphene oxide (RGO). We focused on the effect of the ratio of the addition of CNFs and the formation process of the film on the electrochemical and mechanical properties. The results show that the CNFs/RGO12 (where the ratio of CNFs to GO is 1:2) film displayed outstanding comprehensive properties; its tensile strength and conductivity were up to 83 MPa and 202.94 S/m, respectively, and its CA value was as high as 146 mF cm−2 under the current density of 5 mA cm−2. Furthermore, the initial retention rate of the specific capacitance was about 83.7% when recycled 2000 times; moreover, its capacitance did not change much after perpendicular bending 200 times. Therefore, the films prepared by this study have great potential in the field of flexible supercapacitors.

The Effect of Support on the Electrochemical Performance of Composite Electrode Materials for Supercapacit

2011 ◽  
Vol 239-242 ◽  
pp. 1010-1013 ◽  
Author(s):  
Yan Hong Sun ◽  
Jia Chang Zhao ◽  
Hong Hua Zhou ◽  
Bo He Jin Tang ◽  
Yu Qing Gu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Incipient Wetness Impregnation ◽  
Nickel Compounds ◽  
Effect Of Support

Composite electrode materials for supercapacitor were prepared by a combination of incipient wetness impregnation and hydrothermal method in this study. The materials were characterized by XRD, specific surface area and electrochemical testing. The effect of support on the electrochemical performance of the composite electrode materials was investigated. The result shows that the samples prepared by different supports contain nickel nitrate hydroxide hydrate (the electroactive material in the composite) and undecomposed nickel nitrate.The specific surface area decrease after the loading of nickel compounds, which indicates the exisitance of nickel compounds in the pores. The composite prepared by using diatomite support exhibits higher specific capacitance than those prepared by using SBA-15 and Ti-Si molecular sieve, which delivers the specific capacitance of 1162.77 F/g at the scan rate of 5 mV/s.

scholarly journals Development of 3D-Printed MWCNTs/AC/BNNTs Ternary Composite Electrode Material with High-Capacitance Performance

2021 ◽  
Vol 11 (6) ◽  
pp. 2636
Author(s):  
Asrar Alam ◽  
Ghuzanfar Saeed ◽  
Seong Min Hong ◽  
Sooman Lim
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Electrode Material ◽  
High Performance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Potential Candidate ◽  
Ternary Composite ◽  
Capacitance Performance ◽  
Capacitive Properties

Activated carbon (AC) and multiwalled carbon nanotubes (MWCNTs) have been extensively investigated in recent decades as electrical double-layer capacitor (EDLC) electrode materials for supercapacitors, owing to their superior capacitive properties and cycling stability performance. However, in the modern electronics industry, ternary electrode materials have been designed to develop high-performance and efficient energy storage devices. EDLC-based ternary materials are of great importance, where all the present components participate both individually and as a multicomponent electrode system to promote high-electrochemical performance electrode materials. In this study, we have incorporated an optimized content of boron nitride nanotube (BNNT) powder into a binary material composed of AC and MWCNTs to enhance their electrochemical performance using a pneumatic printer. The printed MWCNTs/AC/BNNTs ternary composite electrode material has shown a maximum specific capacitance of 262 F g−1 at a minimum current density of 1 A g−1, with a capacitance retention of 49.61% at a maximum current density of 10 A g−1. These results demonstrate that the printable MWCNTs/AC/BNNTs ternary composite electrode material is a potential candidate for the development of high-performance supercapacitors.

Study on Preparation and Properties of Novel Ti/Cu Laminated Composite Electrode Materials

2016 ◽  
Vol 19 (2) ◽  
pp. 077-083
Author(s):  
Han Zhaohui ◽  
Zhu Peixian ◽  
Zhou Shenggang ◽  
Guo Yuzhong ◽  
Yang Yi
Keyword(s):  
Composite Material ◽  
Electrochemical Performance ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Pure Titanium ◽  
Base Material ◽  
Laminated Composite ◽  
Diffusion Welding ◽  
Material Structure

This paper starts with the structure design of the electrode base material, Ti/Cu electrode material instead of single metal Ti as the base material which was prepared by hot diffusion welding, the change of composite material structure is influences on electrochemical properties of Ti/Cu that was analyzed by SEM, electrochemical workstation and so on. The results show that the design changes of matrix structure of traditional Ti electrode is good for enhance the electrochemical performance of electrode, due to the design of layered composite structure was used, the inner Cu of composite material is current collector electrode and conductive channel carrier , it reduces the resistivity of the electrode material (its resistivity is only 1/15 of pure titanium electrode material) and improves the electrical conductivity of the electrode, in order to realize the uniformity of the current in the electrode, the electrochemical performance of the electrode was improved for the novel Ti/Cu laminated composite electrode materials.

High Performance Supercapacitor Electrode Materials Based on Activated Carbon and Conducting Polypyrrole

2015 ◽  
Vol 645-646 ◽  
pp. 1150-1155 ◽  
Author(s):  
Wen Tao Yuan ◽  
Ya Jie Yang ◽  
Yong Long Qiu ◽  
Jian Hua Xu ◽  
Wen Yao Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Synergistic Effect ◽  
Electrochemical Performance ◽  
High Performance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Uniform Structure ◽  
Discharge Process ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials

The traditional supercapacitor is made of activated carbon, which shows lower specific capacity and higher resistance. In this paper, we demonstrated preparation of high performance supercapacitor electrode materials based on activated carbon and conducting polymer polypyrrole (ppy). In order to obtain well dispersion of ppy in activated carbon for lower resistance of electrode, a high-speed agate beads milling process was used to mix the ppy and porous carbon powder. By controlling the synergistic effect between ppy and activated carbon, a uniform structure composite electrode was prepared and the performance of this composite based supercapacitor was investigated. Compared with pure activated electrode, the obvious electrochemical performance improvement was achieved in composite electrode after the introduction of ppy. It has been found that electrode based on this composite has a maximum specific capacitance about 159 F/g, which was higher than pure activated carbon, and exhibited low resistance about 3.35 Ohm. The cycle performance results revealed that a 142 F/g (more than 88% of initial capacitance) capacitance was kept in composite electrode after 1000 cycles charge/discharge process. We conclude that the excellent synergistic effect between activated carbon and ppy resulted in superior electrochemical performance of composite electrode. Furthermore, the simple preparing method of composite electrode for supercapacitor assembly has potential commercial applications.

Poly(aniline-co-pyrrole)-coated Ni-doped manganese dioxide as electrode materials for supercapacitors

2020 ◽  
Vol 13 (02) ◽  
pp. 2051007
Author(s):  
Jie Dong ◽  
Qinghao Yang ◽  
Qiuli Zhao ◽  
Zhenzhong Hou ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Cycle Stability ◽  
Mass Ratio ◽  
Scan Rate ◽  
Poly Aniline ◽  
Inorganic And Organic

Electrode materials with a high specific capacitance, outstanding reversibility and excellent cycle stability are constantly pursued for supercapacitors. In this paper, we present an approach to improve the electrochemical performance by combining the advantages of both inorganic and organic. Ni-MnO2/PANi-co-PPy composites are synthesized, with the copolymer of aniline/pyrrole being coated on the surface of Ni-doped manganese dioxide nanospheres. The inorganic–organic composite enables a substantial increase in its specific capacitance and cycle stability. When the mass ratio of Ni-MnO2 to aniline and pyrrole mixed monomer is 1:5, the composite delivers high specific capacitance of 445.49[Formula: see text]F/g at a scan rate of 2[Formula: see text]mV/s and excellent cycle stability of 61.65% retention after 5000 cycles. The results indicate that the Ni-MnO2/PANi-co-PPy composites are promising electrode materials for future supercapacitors application.

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