Mass production of metal-doped graphene from the agriculture waste of Quercus ilex leaves for supercapacitors: inclusive DFT study

Abstract

This work reports a facile, eco-friendly, and cost-effective mass-scale synthesis of metal-doped graphene sheets (MDGs) using agriculture waste of Quercus ilex leaves for supercapacitor applications.

Vanadium pentaoxide-doped waste plastic-derived graphene nanocomposite for supercapacitors: a comparative electrochemical study of low and high metal oxide doping

“…3). [21][22][23][24] Fig. 3 depicts the presence of only two characteristic peaks in the FT-IR spectrum of the WGSA sample, which represents the presence of pi-pi interactions between WGS and the vanadium pentaoxide molecules.…”

“…The presence of the D band belongs to the deformative vibration, which arose due to the breaking down of the carbonic double bonds mainly by the conversion of sp 2 -hybridization to sp 3hybridization. [16][17][18][19][20][21] The G band at 1534 cm À1 also conrmed the presence of unsaturated carbon atoms in the graphene sheets. The presence of the D band at 1336 cm À1 , along with an I 2D /I G of 1.8, depicts the existence of oxidative defects in WGS.…”

“…[18][19][20] They are maintenance-free, possess a greater life cycle, require a simple charging unit, experience no memory effect, and are much safer to use than other traditional devices. [21][22][23][24][25] According to a recent study, the intrinsic capacitance of graphene was found to be 21 Â 10 À6 F cm À2 , which sets the upper limit of capacitance for similar carbon nanomaterials (CNMs). Moreover, the high surface area (2675 m 2 g À1 ) of graphene makes it an outstanding electrode material for supercapacitor applications.…”

“…17 Graphene can be used in various applications, like fuel cells, biosensors, concrete materials drug delivery, polymer nanocomposites, energy conversion and storage devices. [17][18][19][20][21] The production of graphene with WP as the precursor using MPA leads us to the cost-effective and eco-friendly solution to WP and related issues. The recycling of WP using MPA can also act as a viable approach to ensure the quantity, quality, and low-cost production of the value products, such as graphene, irrespective of the source.…”

Advanced asymmetric supercapacitors with a squirrel cage structure Fe3O4@carbon nanocomposite as a negative electrode

“…12 In previous reports, carbon materials are usually considered as promising anode material for supercapacitors due to its good conductivity, low cost as well as wide potential window, however, the obtained energy density and specic capacitance are relatively low. [13][14][15][16] In this regard, pseudocapacitive anode materials have emerged as the potential candidates, nonetheless, there is an imperative need to further explore superior performance anode material in ASCs owing to the inferior performance and limited reports by far. [17][18][19][20] Currently, iron oxide hydroxide (FeOOH) and iron oxides (Fe 2 O 3 , Fe 3 O 4 ) are generally used as anode materials for batterytype or supercapacitor owing to their natural abundance, low cost, wide working voltage window and high theoretical capacitance.…”