Chemical Production of Graphene Oxide with High Surface Energy for Supercapacitor Applications

C

Tarik Chafik¹  Ouassim Boujibar²  Fouad Ghamouss²  Sanaa Lahmar²  Mehdi Karbak²  Cecile Autret-Lambert³ 

[1] Laboratory of Chemical Engineering and Resources Valorization (LGCVR), Faculty of Sciences and Techniques, University Abdelmalek Essaadi, B.P. 416, Tangier 90010, Morocco;Laboratory of Physical-Chemistry of Materials and Electrolytes for Energy (PCM2E), University of Tours, 37200 Tours, France;Materials Research Group, Microelectronics, Acoustics and Nanotechnologies, GREMAN, (UMR 7347), University of Tours, 37200 Tours, France;

关键词: graphene oxide;    graphene;    graphite;    supercapacitor;   

DOI  :  10.3390/c8020027

来源: DOAJ

【 摘 要 】

The chemical exfoliation of graphite to produce graphene and its oxide is undoubtedly an economical method for scalable production. Carbon researchers have dedicated significant resources to developing new exfoliation methods leads to graphene oxides with high quality. However, only a few studies have been dedicated to the effect of the starting graphite material on the resulting GO. Herein, we have prepared two different GOs through chemical exfoliation of graphite materials having different textural and structural characteristics. All samples have been subjected to structural investigations and comprehensive characterizations using Raman, X-ray diffraction, scanning electron microscopy, TGA, N₂ physisorption, and FTIR spectroscopy. Our results provide direct evidence of how the crystallite size of the raw graphite affects the oxidation degree, surface functionality, and sheet size of the resulting GO. Building on these significant understandings, the optimized GO achieves a highly specific capacitance of 191 F·g⁻¹ at the specific current of 0.25 A·g⁻¹ in an aqueous electrolyte. This superior electrochemical performance was attributed to several factors, among which the specific surface area was accessible to the electrolyte ions and oxygenated functional groups on the surface, which can significantly modify the electronic structure of graphene and further enhance the surface energy.

【 授权许可】

Unknown