Improvement of capacitive performances of symmetric carbon/carbon supercapacitors by addition of nanostructured polypyrrole powder

Abstract

International audienceA nanostructured polypyrrole powder was synthesized in a previous work from the oxidation of pyrroleby a nanostructured MnO2 powder used simultaneously as an oxidizing agent and a sacrificial templatein a redox heterogeneous mechanism. In this study, this original PPy powder was used as an activeadditive material with different ratio in carbon/carbon symmetrical supercapacitors whose performanceswere studied by cyclic voltammetry and electrochemical impedance spectroscopy (EIS) using aSwagelok-type cell. From the EIS spectra, the complex capacitance was extracted using a model involvingtwo ColeeCole type complex capacitances linked in series. The specific capacitance values evaluated byEIS and cyclic voltammetry are in a good agreement between them. The results show that the addition ofnanostructured polypyrrole powder improves significantly the specific capacitance of the carbon electrodeand consequently the performances of carbon/carbon supercapacitors. The original and versatilesynthesis method used to produce this polypyrrole powder appears to be attractive for large scaleproduction of promising additives for electrode materials of supercapacitors

Switching of the ion exchange behaviour of PEDOT thin films during a potential cycling: An electrochemical atomic force microscopy study

“…Moreover, they can be functionnalised using different strategies such as covalent grafting of functional groups on their monomers, electrochemical doping, or insertion of nano-objects (nanoparticles, enzymes, …) during the synthesis step. All the abovementioned properties of ECPs are electrochemically tunable, which justifies that ECPs are widely involved in a large number of applications, among which one can cite, in a non-exhaustive list, supercapacitors [3][4][5][6][7],…”

Electrochemical codeposited polypyrrole–tungsten oxide composite materials with wide potential windows

“…[13][14][15][16][17][18][19][20] Polypyrrole (PPy) has attracted wide attention due to its advantages of simple synthesis, environmental protection, low cost, and nontoxicity. [21][22][23][24] In addition, the transition metal tungsten oxide (WO 3 ) is considered a promising negative electrode material due to its abundant resources, various valence states, and electrochemical activity at negative potential. [25][26][27][28] Many studies have reported the application of a PPy and WO 3 composites in gas-sensing and electrochromic devices.…”

Enhancing the performance of polypyrrole composites as electrode materials for supercapacitors by carbon nanotubes additives

“…Some drawbacks of such materials can be corrected by the addition of carbon materials. In order to overcome the issues associated with poor cyclability of PPy (which occur mostly due to its volume changes during faradaic processes such as redox reactions) and improve the mechanical properties, the allotropes of carbon with nanoscale diameter, that is, nanotubes or graphene are mainly applied . Many approaches have been developed to overcome problems associated with the homogeneous dispersion of carbon nanostructures in composite materials.…”