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Banda, H., Perie, S., Daffos, B., Taberna, P.-L., Dubois, L., Crosnier, O., Simon, P., Lee, D., De Paepe, G. & Duclairoir, F. (2019) Sparsely Pillared Graphene Materials for High-Performance Supercapacitors: Improving Ion Transport and Storage Capacity. ACS Nano, 13 1443–1453. 
Added by: Richard Baschera (2019-03-26 11:10:04)   Last edited by: Richard Baschera (2019-03-26 11:11:41)
Type de référence: Article
DOI: 10.1021/acsnano.8b07102
Clé BibTeX: Banda2019a
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Catégories: ST2E
Créateurs: Banda, Crosnier, Daffos, De Paepe, Dubois, Duclairoir, Lee, Perie, Simon, Taberna
Collection: ACS Nano
Consultations : 5/1028
Indice de consultation : 5%
Indice de popularité : 1.25%
Résumé     
Graphene-based materials are extensively studied as promising candidates for supercapacitors (SCs) owing to the high surface area, electrical conductivity, and mechanical flexibility of graphene. Reduced graphene oxide (RGO), a close graphene-like material studied for SCs, offers limited specific capacitances (100 F.g(-1)) as the reduced graphene sheets partially restack through pi-pi interactions. This paper presents pillared graphene materials designed to minimize such graphitic restacking by cross-linking the graphene sheets with a bifunctional pillar molecule. Solid-state NMR, X-ray diffraction, and electrochemical analyses reveal that the synthesized materials possess covalently cross-linked graphene galleries that offer additional sites for ion sorption in SCs. Indeed, high specific capacitances in SCs are observed for the graphene materials synthesized with an optimized number of pillars. Specifically, the straightforward synthesis of a graphene hydrogel containing pillared structures and an interconnected porous network delivered a material with gravimetric capacitances two times greater than that of RGO (200 F.g(-1) vs 107 F.g(-1)) and volumetric capacitances that are nearly four times larger (210 F.cm(-3) vs 54 F.cm(-3)). Additionally, despite the presence of pillars inside the graphene galleries, the optimized materials show efficient ion transport characteristics. This work therefore brings perspectives for the next generation of high-performance SCs.
  
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