Author
Valerie Bertagna
Bio: Valerie Bertagna is an academic researcher from University of Orléans. The author has contributed to research in topics: Polypyrrole & Supercapacitor. The author has an hindex of 3, co-authored 4 publications receiving 1108 citations.
Topics: Polypyrrole, Supercapacitor, Nanotube, Capacitance, Carbon nanotube
Papers
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TL;DR: In this paper, the capacitance of supercapacitors built from multi-walled carbon nanotubes electrodes has been investigated and correlated with microtexture and elemental composition of the materials.
Abstract: Electrochemical characteristics of supercapacitors built from multiwalled carbon nanotubes electrodes have been investigated and correlated with microtexture and elemental composition of the materials. Capacitance has been estimated by cyclovoltammetry at different scan rates from 1 to 10 mV/s, galvanostatic discharge, and impedance spectroscopy in the frequency range from 100 kHz to 1 mHz. The presence of mesopores due to the central canal and/or entanglement is at the origin of an easy accessibility of the ions to the electrode/electrolyte interface for charging the electrical double layer. Pure electrostatic attraction of ions as well as quick pseudofaradaic reactions have been detected upon varying surface functionality. The values of specific capacitance varied from 4 to 135 F/g, depending on the type of nanotubes or/and their posttreatments. Even with moderate specific surface area (below 470 m2/g), due to their accessible mesopores, multiwalled carbon nanotubes represent attractive materials for su...
680 citations
TL;DR: In this paper, a composite electrode based on multiwalled carbon nanotubes (MWNTs) coated with polypyrrole (PPy) has been used in supercapacitors.
475 citations
TL;DR: In this paper, multiwalled nanotubes (MWNTs) composites with electrodeposited polypyrrole (PPy) have been proposed as electrode materials for supercapacitors.
Abstract: Multiwalled nanotubes (MWNTs) composites with electrodeposited polypyrrole (PPy) have been proposed as electrode materials for supercapacitors. The total capacitance of the nanocomposite combines a pure electrostatic attraction of ions and the electrochemical redox reactions of the -conjugated system of PPy. A synergy effect has been found between the two components of the nanocomposite. The mesoporous network of the nanotubular material supplies very good transport conditions for ions, and PPy enhances its conducting properties. A high ability of charge accumulation in such volumetric capacitor was obtained with capacitance values of 165 F/g of material.
20 citations
26 Mar 2001
TL;DR: In this article, different types of nanotubular carbon materials have been used for storage of energy in supercapacitors and the values of capacitance obtained from modified nanotube electrodes varied from 20 to 170 F/g.
Abstract: Different types of nanotubular carbon materials have been used for storage of energy in supercapacitors. Application of various multi-walled and single walled nanotubes as electrodes for capacitors proved the high ability of these materials for the accumulation of charges in electrode/electrolyte interface due to their unique mesoporosity. Apart from electrostatic attraction, pseudocapacitance reactions have been observed because of functionalization of nanotubes, deposition of conducting polypyrrole or presence of metallic particles. The values of capacitance obtained from modified nanotube electrodes varied from 20 to 170 F/g.
1 citations
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TL;DR: Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density.
Abstract: In this critical review, metal oxides-based materials for electrochemical supercapacitor (ES) electrodes are reviewed in detail together with a brief review of carbon materials and conducting polymers. Their advantages, disadvantages, and performance in ES electrodes are discussed through extensive analysis of the literature, and new trends in material development are also reviewed. Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density of ES (476 references).
7,642 citations
TL;DR: This Review introduces several typical energy storage systems, including thermal, mechanical, electromagnetic, hydrogen, and electrochemical energy storage, and the current status of high-performance hydrogen storage materials for on-board applications and electrochemicals for lithium-ion batteries and supercapacitors.
Abstract: [Liu, Chang; Li, Feng; Ma, Lai-Peng; Cheng, Hui-Ming] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.;Cheng, HM (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China;cheng@imr.ac.cn
4,105 citations
TL;DR: In this article, different types of capacitors with a pure electrostatic attraction and/or pseudocapacitance effects are presented, and their performance in various electrolytes is studied taking into account the different range of operating voltage (1V for aqueous and 3 V for aprotic solutions).
4,091 citations
TL;DR: Department of Materials Science, University of Patras, Greece, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, and Dipartimento di Scienze Farmaceutiche, Universita di Trieste, Piazzale Europa 1, 34127 Triesteadays.
Abstract: Department of Materials Science, University of Patras, 26504 Rio Patras, Greece, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Avenue, 116 35 Athens, Greece, Institut de Biologie Moleculaire et Cellulaire, UPR9021 CNRS, Immunologie et Chimie Therapeutiques, 67084 Strasbourg, France, and Dipartimento di Scienze Farmaceutiche, Universita di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
3,886 citations
TL;DR: Supercapacitors are able to store and deliver energy at relatively high rates (beyond those accessible with batteries) because the mechanism of energy storage is simple charge-separation (as in conventional capacitors) as discussed by the authors.
3,620 citations