A supercapacitor with ultrahigh volumetric capacitance produced by self-assembly of reduced graphene oxide through phosphoric acid treatment. Issue 36 (7th September 2020)

• Record Type: Journal Article
• Authors: Liu, Zhaoyuan; Wang, Lidong; Ma, Guizhi; Yuan, Yinan; Jia, Henan; Fei, Weidong
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 36(2020)
• Page Start: 18933
• Page End: 18944
• Publication Date: 2020-09-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta06042a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Self-assembled reduced graphene oxide was prepared by a phosphoric acid heat-treatment method and exhibited an ultra-high volumetric capacitance. Abstract : Reduced graphene oxide (RGO) with a porous nanostructure and large surface area suffers from poor volumetric capacitance when it is employed in supercapacitors. This paper reports a facile, scalable and efficient method to produce self-assembled reduced graphene oxide with high packing density (1.55 g cm −3 ) via phosphoric acid treatment (PAT) at moderate temperatures (200–400 °C). The PAT process could not only controllably preserve redox-active C–OH and CO groups which can provide large and stable pseudocapacitance, but also contribute to the formation of a well self-assembled compact structure. Due to the pseudocapacitive behavior of the electrochemically active oxygen functional groups as well as the compact layered structure, the reduced graphene oxide (RGO-MP40) exhibits an ultrahigh volumetric capacitance (482 F cm −3 and 384 F cm −3 at a mass loading of 2.5 mg cm −2 and 19.7 mg cm −2, respectively). This novel strategy holds great promise for designing graphene-based materials for compact energy-storage devices.