Influence of acidic type on nanostructures and electrochemical performance of polyaniline for flexible supercapacitors and improved performance based on 3D honeycomb-like nanosheet by doping HPF6 acid

2021 ◽  
pp. 138818
Author(s):  
Caixia Zhou ◽  
Shuai He ◽  
Haocheng Yang ◽  
Junjie An ◽  
Lufa Yang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Flexible Supercapacitors ◽  
Improved Performance ◽  
Acidic Type

scholarly journals Exploring the electrochemical performance of graphite and graphene paste electrodes composed of varying lateral flake sizes

2018 ◽  
Vol 20 (30) ◽  
pp. 20010-20022 ◽  
Author(s):  
Anthony J. Slate ◽  
Dale A. C. Brownson ◽  
Ahmed S. Abo Dena ◽  
Graham C. Smith ◽  
Kathryn A. Whitehead ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electrochemical Performance ◽  
Direct Relationship ◽  
Graphite Electrodes ◽  
Improved Performance ◽  
Electron Transfer Properties ◽  
Transfer Properties

A direct relationship is shown with respect to the lateral flake size comprising graphene and graphite electrodes and their corresponding electron transfer properties, with smaller flake sizes (increased edge plane contributions) resulting in improved performance.

scholarly journals Ionic liquid based EDLCs: influence of carbon porosity on electrochemical performance

2014 ◽  
Vol 172 ◽  
pp. 163-177 ◽  
Author(s):  
Asa Noofeli ◽  
Peter J. Hall ◽  
Anthony J. R. Rennie
Keyword(s):  
Electrochemical Performance ◽  
Pore Size ◽  
Electrochemical Impedance ◽  
Constant Current ◽  
Peak Performance ◽  
Promising Alternative ◽  
Electrochemical Stabilities ◽  
Electrochemical Double Layer ◽  
Improved Performance ◽  
Operating Potential

Electrochemical double layer capacitors (EDLCs) are a category of supercapacitors; devices that store charge at the interface between electrodes and an electrolyte. Currently available commercial devices have a limited operating potential that restricts their energy and power densities. Ionic liquids (ILs) are a promising alternative electrolyte as they generally exhibit greater electrochemical stabilities and lower volatility. This work investigates the electrochemical performance of EDLCs using ILs that combine the bis(trifluoromethanesulfonyl)imide anion with sulfonium and ammonium based cations. Different activated carbon materials were employed to also investigate the influence of varying pore size on electrochemical performance. Electrochemical impedance spectroscopy (EIS) and constant current cycling at different rates were used to assess resistance and specific capacitance. In general, greater specific capacitances and lower resistances were found with the sulfonium based ILs studied, and this was attributed to their smaller cation volume. Comparing electrochemical stabilities indicated that significantly higher operating potentials are possible with the ammonium based ILs. The marginally smaller sulfonium cation performed better with the carbon exhibiting the largest pore width, whereas peak performance of the larger sulfonium cation was associated with a narrower pore size. Considerable differences between the performance of the ammonium based ILs were observed and attributed to differences not only in cation size but also due to the inclusion of a methoxyethyl group. The improved performance of the ether bond containing IL was ascribed to electron donation from the oxygen atom influencing the charge density of the cation and facilitating cation–cation interactions.

An in situ grown bacterial nanocellulose/graphene oxide composite for flexible supercapacitors

2017 ◽  
Vol 5 (27) ◽  
pp. 13976-13982 ◽  
Author(s):  
Qisheng Jiang ◽  
Clayton Kacica ◽  
Thiagarajan Soundappan ◽  
Keng-ku Liu ◽  
Sirimuvva Tadepalli ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Conducting Polymer ◽  
Supercapacitor Electrode ◽  
Bacterial Nanocellulose ◽  
Oxide Composite ◽  
Flexible Supercapacitor ◽  
Flexible Supercapacitors ◽  
Excellent Electrochemical Performance

A flexible supercapacitor electrode with excellent electrochemical performance and mechanical flexibility is fabricated via in situ incorporation of graphene oxide flakes and conducting polymer (PEDOT:PSS) into a layered bacterial nanocellulose network during its growth.

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.

Tailorable polypyrrole nanofilms with exceptional electrochemical performance for all-solid-state flexible supercapacitors

2017 ◽  
Vol 249 ◽  
pp. 360-368 ◽  
Author(s):  
Nana Bai ◽  
Zhen Xu ◽  
Yan Tian ◽  
Ligang Gai ◽  
Haihui Jiang ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Flexible Supercapacitors

Hierarchical TiN nanoparticles-assembled nanopillars for flexible supercapacitors with high volumetric capacitance

Nanoscale ◽  
2018 ◽  
Vol 10 (18) ◽  
pp. 8728-8734 ◽  
Author(s):  
Ping Qin ◽  
Xingxing Li ◽  
Biao Gao ◽  
Jijiang Fu ◽  
Lu Xia ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Flexible Supercapacitors ◽  
Tin Nanoparticles ◽  
Excellent Electrochemical Performance ◽  
Volumetric Capacitance

Hierarchical TiN nanoparticles-assembled nanopillars arrays with excellent electrochemical performance were synthesized for flexible supercapacitors.

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