scholarly journals Systematic Design of Polypyrrole/Carbon Fiber Electrodes for Efficient Flexible Fiber-Type Solid-State Supercapacitors

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 248 ◽  
Author(s):  
Yu-Shun Sung ◽  
Lu-Yin Lin
Keyword(s):  
Energy Storage ◽  
Carbon Fiber ◽  
Fiber Type ◽  
Coulombic Efficiency ◽  
Discharge Process ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Flexible Fiber ◽  
Carbon Fiber Electrodes ◽  
Soft Electronics

Fiber-type supercapacitors (FSC) have attracted much attention as efficient energy storage devices for soft electronics. This study proposes the synthesis of polypyrrole (PPy) on carbon fiber (CF) using electropolymerization as the energy storage electrode for FSC. Effects of the electrolyte, applied current, and time of electropolymerization for synthesizing PPy on CF are investigated. The configuration of the electrochemical system is also studied to better understand the electropolymerization of PPy. The highest specific capacitance (CM) of 308.2 F/g are obtained for the PPy electrode prepared using 0.5 M pyrrole and 0.3 M NaClO4 as the electrolyte at 40 mA for 20 min. The FSC assembled with PPy electrodes and the polyvinyl alcohol/H3PO4 gel electrolyte shows a CM value of 30 F/g and the energy density of 5.87 Wh/kg at the power density of 60.0 W/kg. Excellent cycling stability with CM retention of 70% and Coulombic efficiency higher than 98% in 3000 times charge/discharge process, and the good bending capability with CM retention of 153% and 148%, respectively, under the bending angle of 180° and the bending times of 600 are achieved. This work gives deeper understanding of electropolymerization and provides recipes for fabricating an efficient PPy electrode for soft energy storage devices.

Flexible and wearable fiber shaped high voltage supercapacitors based on copper hexacyanoferrate and porous carbon coated carbon fiber electrodes

2016 ◽  
Vol 4 (13) ◽  
pp. 4934-4940 ◽  
Author(s):  
S. T. Senthilkumar ◽  
Junsoo Kim ◽  
Yu Wang ◽  
Haitao Huang ◽  
Youngsik Kim
Keyword(s):  
Energy Storage ◽  
Carbon Fiber ◽  
High Voltage ◽  
Light Weight ◽  
Energy Storage Devices ◽  
Copper Hexacyanoferrate ◽  
Storage Devices ◽  
Carbon Fiber Electrodes ◽  
Carbon Coated ◽  
Coated Carbon

Fiber supercapacitors have been considered as one of the promising candidates for light weight, flexible and wearable energy storage devices.

Self-discharge Reactions in Energy Storage Devices Based on Polypyrrole-cellulose Composite Electrodes

Green ◽  
2014 ◽  
Vol 4 (1-6) ◽  
Author(s):  
Henrik Olsson ◽  
Martin Sjödin ◽  
Erik Jämstorp Berg ◽  
Maria Strømme ◽  
Leif Nyholm
Keyword(s):  
Energy Storage ◽  
High Surface ◽  
Polymer System ◽  
Positive Electrode ◽  
The Self ◽  
Discharge Process ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Electrode Potentials ◽  
New Findings

AbstractThe self-discharge behavior of organic electrodes and symmetric devices for sustainable energy storage, composed of electrodes containing a thin layer of polypyrrole coated onto a high surface area cellulose matrix, has been studied for the first time using different electrode sizes and electrolytes. Experimental data from open circuit measurements of the individual electrode potentials of charged symmetrical two-electrode energy storage devices as a function of time were evaluated based on three different self-discharge models. This evaluation clearly showed that the self-discharge process of the positive electrode is governed by a previously undetected activation-controlled faradaic reaction while the self-discharge of the negative electrode is due to diffusion controlled oxidation involving oxygen dissolved in the electrolyte. Potentiostatic three-electrode measurements and spectroelectrochemical experiments also showed that protons as well as maleimide were released from positively polarized polypyrrole electrodes. These new findings clearly show that the self-discharge of the cells originate from two different types of reactions on the positive and negative electrodes and that the main contribution to the self-discharge of the cells comes from an activation controlled reaction involving the positive electrode. These results provide an improved understanding of polypyrrole based devices and also yield new possibilities for the development of stable conducting polymer system for energy storage applications.

Small Molecule-based Supramolecular-Polymer Double-Network Hydrogel Electrolytes for Ultra-Stretchable and Waterproof Zn–air Batteries Working from –50 to 100 °C

2021 ◽  
Author(s):  
Chaonan Gu ◽  
Xiao-Qiao Xie ◽  
Yujia Liang ◽  
Jingjing Li ◽  
Hai Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Small Molecule ◽  
Energy Supply ◽  
Supramolecular Polymer ◽  
Energy Storage Devices ◽  
Double Network ◽  
Storage Devices ◽  
Highly Stretchable ◽  
Soft Electronics

Increasing boom in soft electronics field has boosted the development of highly stretchable and environment-adaptable energy storage devices based on hydrogel electrolytes. Development of such soft energy supply devices still...

Flexible fiber-type zinc–carbon battery based on carbon fiber electrodes

Nano Energy ◽  
2013 ◽  
Vol 2 (6) ◽  
pp. 1242-1248 ◽  
Author(s):  
Xiao Yu ◽  
Yongping Fu ◽  
Xin Cai ◽  
Hany Kafafy ◽  
Hongwei Wu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Fiber Type ◽  
Flexible Fiber ◽  
Carbon Fiber Electrodes

scholarly journals Limitations and Characterization of Energy Storage Devices for Harvesting Applications

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 783 ◽  
Author(s):  
Roberto de Fazio ◽  
Donato Cafagna ◽  
Giorgio Marcuccio ◽  
Paolo Visconti
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Voltage Drop ◽  
Discharge Rate ◽  
Open Circuit ◽  
The Self ◽  
Discharge Process ◽  
Energy Storage Devices ◽  
Time Duration ◽  
Storage Devices

This paper aims to study the limitations and performances of the main energy storage devices commonly used in energy harvesting applications, namely super-capacitors (SC) and lithium polymer (LiPo) batteries. The self-discharge phenomenon is the main limitation to the employment of SCs to store energy for a long time, thus reducing efficiency and autonomy of the energy harvesting system. Therefore, the analysis of self-discharge trends was carried out for three different models of commercial SCs, describing the phenomenon in terms of self-discharge rate and internal resistance. In addition, physical interpretations concerning the self-discharge mechanism based on the experimental data are provided, thus explaining the two super-imposed phenomena featured by distinct time constants. Afterwards, the dependence of self-discharge phenomenon from the charging time duration (namely, SCs charged at 5 V and then kept under charge for one or five hours) was analyzed; by comparing the voltage drop during the self-discharge process, a self-discharge reduction for longer charging durations was obtained and the physical interpretation provided (at best −6.8% after 24 h and −13.4% after 120 h). Finally, self-discharge trends of two commercial 380 mAh LiPo batteries (model LW 752035) were acquired and analyzed; the obtained results show an open circuit voltage reduction of only 0.59% in the first 24 h and just 1.43% after 124 h.

Alumina’s Effect as Blocking Layer on Self-discharge Process: Case Study of Supercapacitors as Energy storage Devices

2019 ◽  
Author(s):  
Adekunle Akim Salami ◽  
Koffi M. Kodjo ◽  
Seibou Boureima ◽  
Agbassou Guenoupkati ◽  
Koffi Agbeblewu Dotche ◽  
...  
Keyword(s):  
Energy Storage ◽  
Discharge Process ◽  
Blocking Layer ◽  
Energy Storage Devices ◽  
Storage Devices
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