Anthraquinone modification of microporous carbide derived carbon films for on-chip micro-supercapacitors applications

Abstract

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. A B S T R A C TThe modification of carbide derived carbon (CDC) thin film electrodes with anthraquinone (AQ) molecules was demonstrated by using pulsed chronoamperometry, in 0.1 M NEt 4 BF 4 /ACN solution of AQ diazonium derivative. The functionalization of CDC electrodes was only possible when a critical pore size is reached: only 2 nm pore diameter CDC can be grafted with AQ moieties, smaller pore size leading to a poorly functionalized electrode. High AQ surface coverage of 0.88 Â 10 À10 mol.cm À2 was determined using 2 nm pore size CDC. Despite a decrease in double layer capacitance value of about 10%, the total capacitance of the AQ-modified on-chip CDC electrodes was twice larger than that of pristine CDC film, leading to high total capacitance value of 44 mF.cm À2 (338 F.cm À3). The cyclability of the AQ-modified onchip CDC electrode was also investigated. The faradic contribution of AQ grafted molecules progressively decreased during cycling and only 39% of the normalized capacity remained after 500 cycles; this decrease has been assigned to electrostatic repulsion of dianionic AQ confined in narrow micropores in the alkaline media.

Novel mesoporous electrode materials for symmetric, asymmetric and hybrid supercapacitors

“…Large surface area providing electronically conducting carbon nanomaterials have achieved great interest in the recent past [23][24][25][26][27]. Carbon nanomaterials including activated porous carbons, carbon nanofibers (CNFs), CNTs, carbon nanopetals, graphene, graphene-oxide, exfoliated-graphite nanosheets, etc exhibit excellent chemical and electrochemical stabilities and are used as electrode materials for supercapacitors with long cycle life and shelf-life [28][29][30][31][32]. Most of the carbon nanomaterials exhibit electric double layer formation for their charge storage; e.g.…”

Grafting of Quinones on Carbons as Active Electrode Materials in Electrochemical Capacitors

“…55 CDC film electrodes can be efficiently grafted with AQ moieties for pore size larger than 2 nm while the CDC with smaller pore size led to a poorly functionalized electrode. As for other carbon materials, a significant increase of the charge storage properties was observed with an appropriate loading of anthraquinone molecules when cycled in alkaline electrolyte.…”

“…The decrease of the Faradaic charge of the quinone molecules was attributed to electrostatic repulsion of the reduced dianionic anthraquinone species (Scheme 1) confined in narrow micropores in the alkaline media. 55 …”

Comparative Study on Supercapacitive Performances of Hierarchically Nanoporous Carbon Materials With Morphologies From Submicrosphere to Hexagonal Microprism

“…Compared with pseudocapacitors, the energy storage mechanism of EDLCs is via physical accumulation of charge at the electrode–electrolyte interface, which will result in fast charge–discharge rates and long lifetimes (Wang L. L. et al, 2017 ; Guo et al, 2018 ; Chen et al, 2019 ; Muzaffara et al, 2019 ; Lv et al, 2020 ). During the past few decades, bulk carbon materials including active carbon (Lee et al, 2017 ; Zhang X. R. et al, 2019 ), mesoporous carbon (Bo et al, 2019 ; Wei et al, 2020b , c ), graphene (El-Kady et al, 2016 ; Wang F. X. et al, 2017 ), carbon nanotube (Afzal et al, 2017 ; Zhang et al, 2017 ), and carbide-derived carbon (Dyatkin et al, 2016 ; Brousse et al, 2017 ) have been extensively documented as electrode materials for EDLCs. Although these carbon-based EDLCs exhibit high power density and rapid charge–discharge rate, the unsatisfactory energy density of carbon-based SCs (4–5 Wh kg −1 ) was still a limitation (Chang et al, 2017 ; Yang and Zhou, 2017 ; Wan et al, 2019 ).…”