Binder free heteroatom‐doped graphene oxide as high energy density electrodes for supercapacitor applications

Abstract

We explored the potential of heteroatom-doped graphene oxide (GO)-based electrodes for energy storage. Binder-free electrodes were synthesized using the hydrothermal method, where doping of GO and its electrode development was achieved simultaneously in one step. GO was doped with nitrogen (NGO) and boron (BGO) using urea and boric acid as nitrogen (N) and boron (B) sources, respectively. In addition, GO was also co-doped with B and N (BNGO). The atomic percentages of nitrogen and boron in NGO and BGO were found out to be 6.13% and 17.94%, respectively, as revealed by XPS. The BNGO had atomic percentages of boron and nitrogen as 23.76% and 3.64%, respectively. Electrodes were electrochemically characterized in 3 M KOH electrolyte by employing cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD). CV analysis revealed that NGO and BNGO exhibited superior charge storage capacity with a high specific capacitance of 855 and 811 F g À1 , respectively, at 1 m Vs À1 . CV data were further analyzed to identify and quantify charge storage mechanism, and it suggested that binder-free-doped electrodes exhibited diffusioncontrolled charge storage as dominant behavior. Thus, our results demonstrate an approach to dope GO and develop high-performance, binder-free electrodes for supercapacitor applications in a facile single-step hydrothermal method.

Selective NO2 Gas Sensors Employing Nitrogen- and Boron-Doped and Codoped Reduced Graphene Oxide

“…Graphene was first produced and identified by Geim and Novoselov in 2004 at the University of Manchester. , It is a single layer of graphite with a thick sheet of sp 2 -bonded carbon atoms arranged in a honeycomb lattice . This carbon-based nanomaterial has attracted the interest of many researchers due to its outstanding and unique properties in various fields, such as energy storage, electronics, and organic solar cells. − Moreover, graphene-based gas sensors have emerged as promising candidates for reaching the market due to their excellent features, such as 2D-like structure (high surface area 2629 m 2 ·g –1 ) and high carrier mobility. , Nevertheless, despite all of these good properties, pristine graphene is not well suited as a gas-sensitive nanomaterial because of its chemical inertness and lack of active sites for the physisorption or chemisorption of gas molecules. , …”

Facile synthesis of the SnTe/SnSe binary nanocomposite via a hydrothermal route for flexible solid-state supercapacitors

“…Therefore, supercapacitors have a positive future in the market as energy storage devices, and their application is expanding by the day. [2][3][4] Both double-layer electrochemical capacitors and pseudocapacitors store energy via reversible and rapid faradaic redox reactions on the surface of electrocatalytic species, and electrochemical double-layer capacitors (EDLCs) typically give an elevated P d (10k W kg −1 ) and exhibit exceptional cycling characteristics (10 4 cycles). 5,6 Thus, faradaic pseudocapacitors have more specic capacitance and specic energy than conventional capacitors (100 W h kg −1 ).…”

KOH mediated hydrothermally synthesized hexagonal‐CoMn 2 O 4 for energy storage supercapacitor applications

“…[1][2][3] Lithium-ion batteries and supercapacitors are the two major devices for the electric-powered storage system in various fields. [4][5][6][7] Among them, the supercapacitor has captured worldwide attention as a potential applicant for future power storage applications, including in telecommunication technology, power tools, hybrid energy sources, microchips, hydrogen fuel storage, etc., because of its high power density, flexibility, high power conversion rate, simple maintenance, longer life span, and environmentally friendly nature. 8,9 A supercapacitor is differentiated into two classes based on its electrical charge storage process: pseudocapacitors and electrical double-layer capacitors (EDLCs).…”

“…The increasing demands on home appliances, electric cars, and portable devices like smartphones have trigged active extensive investigation in the scientific community to explore excellent growth in electric power storage technologies 1‐3 . Lithium‐ion batteries and supercapacitors are the two major devices for the electric‐powered storage system in various fields 4‐7 . Among them, the supercapacitor has captured worldwide attention as a potential applicant for future power storage applications, including in telecommunication technology, power tools, hybrid energy sources, microchips, hydrogen fuel storage, etc., because of its high power density, flexibility, high power conversion rate, simple maintenance, longer life span, and environmentally friendly nature 8,9 .…”