Novel Keplerate type polyoxometalate-surfactant-graphene hybrids as advanced electrode materials for supercapacitors

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PAKULSKI, Dawid, GORCZYŃSKI, Adam, CZEPA, Włodzimierz, LIU, Zhaoyang, ORTOLANI, Luca, MORANDI, Vittorio, PATRONIAK, Violetta, CIESIELSKI, Artur et SAMORÌ, Paolo, sans date. Novel Keplerate type polyoxometalate-surfactant-graphene hybrids as advanced electrode materials for supercapacitors. Energy Storage Materials. sans date. Vol. 17, pp. 186-193. DOI 10.1016/j.ensm.2018.11.012. 1. .
Accès libre Peer reviewed
Version acceptée pour publication (post-print auteur)
Paternité - Pas d'utilisation commerciale [CC] [BY] [NC]
Auteurs Dawid Pakulski
Adam Gorczyński
Włodzimierz Czepa
Zhaoyang Liu
Luca Ortolani
Vittorio Morandi
Violetta Patroniak
Artur Ciesielski
Paolo Samorì
Unité de recherche du site Institut de Science et d'Ingénierie Supramoléculaires - ISIS - UMR7006
Langue

en
Volume

17
Page de début

186
Page de fin

193
Date de première publication

2018-11-14
ISSN

24058297
Titre de la source (revue, livre…)

Energy Storage Materials
Résumé

The development of novel materials for enhanced electrochemical energy storage applications, in particular for the fabrication of supercapacitors (SCs) displaying increased properties, is a milestone of both fundamental and technological relevance.
Show moreThe development of novel materials for enhanced electrochemical energy storage applications, in particular for the fabrication of supercapacitors (SCs) displaying increased properties, is a milestone of both fundamental and technological relevance. Among nanostructured materials, polyoxometalates (POMs) combined with various carbon-based nanostructures represent a very promising class of hybrid systems for energy storage, yet, guidelines for their rational design and synthesis leading to high-performance SCs is still lacking. Here, we have produced a novel hybrid architecture based on Keplerate type POM (Mo132) functionalized with dodecyltrimethylammonium bromide (DTAB), which upon mixing with electrochemically exfoliated graphene (EEG) nanosheets results in the formation of porous 3D superstructures. Mo132-DTAB-EEG combines the redox activity of POMs and high electrical conductivity of graphene, all synergically mediated by the surfactant-assisted porosity enhancement, to form new electrode materials for SCs. Cyclic voltammetry and galvanostatic charge/discharge electrochemical studies on Mo132-DTAB-EEG performed in aqueous H2SO4 electrolyte revealed that the unique combination of these three components yields highly efficient energy storage materials. In particular, our highly porous hybrids system exhibits high specific capacitance of 65 F g−1 (93 F cm−3, 93mFcm−2) combined with excellent stability (99% of specific capacitance retained) after 5000 charge/discharge cycles at different current densities, overall displaying significantly improved performance compared to pristine electrochemically exfoliated graphene material. Strong non-covalent interactions between Keplerate type polyoxometalate Mo132-DTAB and graphene surface offer higher stability compared to other hybrid POM/carbon-based systems, and unique electrical properties of the multicomponent structure, thereby paving the way towards the development of novel, and potentially multifunctional, POM-based architectures to be exploited as SC electrode materials.
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DOI 10.1016/j.ensm.2018.11.012
Titre abrégé de la source

Energy Storage Materials
Type de publication

ACL
Domaine

Chimie/Matériaux
Unité de recherche extérieure au site

Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland
CNR-IMM Bologna, Via Gobetti 101, 40129 Bologna, Italy
Fonction

aut
Identifiant idREF 151349363
109288335
Audience

International
Envoyer vers HAL

5
URL https://univoak.eu/islandora/object/islandora:75849