New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

Abstract

In this study, S, N co‐doped graphene‐based electrodes were synthesized by a one‐step, environmentally friendly and low−Cost method known as Yucel's method in the solutions consisting of different concentration ratios of sulfuric and nitric acids and different cycles in the certain potential range for the first time in the literature. The prepared S, N co‐doped graphene‐based electrodes were characterized by spectroscopic, microscopic and electrochemical methods. In electrochemical characterization, cyclic voltammetry and electrochemical impedance spectroscopy were used. The supercapacitor performances were examined by cyclic charge‐discharge tests of the electrodes in the specified supporting electrolyte solution. Areal capacitance values varied from 71.48 mF.cm−2 to 893.2 mF.cm−2 at a current density of 10 mA cm−2 in the prepared electrodes.

Recovery of cobalt as CoS from spent Li-ion batteries and investigation of its use as an electrode material for supercapacitors

“…Cyclic voltammetry is a useful tool for understanding the capacitive behavior of supercapacitors. 40,50,53–55 The obtained rectangular structure of the voltammograms and peak currents shows the capacitive performance of the systems. Fig.…”

“…32,48 Higher pore sizes provide better ion transformations for mobile ions from the solution to the electrode surface in supercapacitor applications. 49–51…”

“…32,48 Higher pore sizes provide better ion transformations for mobile ions from the solution to the electrode surface in supercapacitor applications. [49][50][51] The SEM images and elemental mapping of the ground cobalt sulfide powder are shown in Fig. 4.…”

High performance supercapacitive behaviors of oximes in a poly(aniline-co-pyrrole) based conducting polymer structure

“…[3][4][5] At this point, electrochemical energy storage systems are important candidates for effective and efficient energy storage. [6][7][8][9] Sources of renewable energy can be stored using batteries and supercapacitors. 10,11 Li-ion batteries, lead-acid batteries, and redox-flow batteries are widely used systems for the storage of renewable energy, but they have significant disadvantages.…”

Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors

“…A few reports have investigated this strategy for energy storage applications, mainly by Şahin's group, who could electrochemically graphenize the surface of GPE using cyclic voltammetry in concentrated acids, whereby the surface of GPE was exfoliated via acid-mediated oxidization during the anodic sweep forming graphene oxide that was then reduced to graphene during the cathodic sweep. 14 Moreover, they could introduce dopants to the exfoliated graphene by tuning the acid composition, such as introducing N, 10,18 S, 18 and P 19 dopants, using nitric, sulfuric, and phosphoric acids, respectively. Although this strategy achieved one-step GPE surface exfoliation with impressive SC performance, it has some limitations.…”