Low temperature thermally reduced graphene oxide directly on Ni-Foam using atmospheric pressure-chemical vapour deposition for high performance supercapacitor application

Impact of Thermally Reducing Temperature on Graphene Oxide Thin Films and Microsupercapacitor Performance

“…This behaviour was allotted to the removal of resistive OFGs, i.e., the carboxylic acids attached to the surface edges resisting the flow of electrons [5] (confirmed by the increase in electrical conductivity as the reducing temperature increased). These OFGs also served as a passage for the ions to the bulk internal surface, as well as facilitating the fast redox processes occurring at or near the electrode surface, which can provide pseudocapacitance, as shown by our previously reported results [2,12]. Our electrochemical impedance spectroscopy (EIS) results showed a decrease in the solution resistance, further confirming the removal of the surface-edges functional group.…”

“…Graphene has been widely studied and used in advanced technological applications due to its excellent properties, which make it a possible candidate for the fabrication of gas sensors [1], energy [2], and hydrogen storage devices [3], and transparent conducting electrodes for photovoltaic application [4]. Moreover, each application requires a different set of graphene properties.…”

“…For instance, while high-quality graphene (synthesised by chemical vapour deposition (CVD), bottom-up approach, low yield) is more suitable for electronic applications, it is not compatible with the production of conductive inks due to the lack of functional groups [5]. In addition, functionalised graphene prepared via the chemical exfoliation method (e.g., hummer's method, top-down approach, high yield) of graphite is more suitable for energy-storage applications and other applications, such as gas sensors and polymer composites, because the oxygen functional groups (OFGs) on the graphitic surface act as polymers [6] or nanoparticle anchors [7], as well as increasing pseudocapacitive behaviour [2].…”

Recent advances in Ni-materials/carbon nanocomposites for supercapacitor electrodes

“…The supercapacitor of TRGO/NF//PAC revealed a high specific energy and outstanding stability. 94 The supercapacitor of pure graphene (À) with a Ni/graphene (+) electrode reached a specific energy of 37 W h kg À1 at 5 kW kg À1 and good reversibility. 95 Moreover, carbon-coated nano-Ni 2 P (phosphides)/rGO (Ni 2 P/C/rGO) was constructed and the optimal Ni 2 P/C/rGO exhibited an excellent capacitance of 1338.8 F g À1 .…”

Preparation of Graphene Conductive Fabrics and the Study of Their Degradation Behavior

“…The main methods of used to prepare graphene conductive fabrics include impregnation [22,23], vapour phase deposition [24], electrochemical deposition [25], vacuum filtration [26] and electrophoresis [27]. Compared to the other methods, the impregnation method has many advantages, such as easy operation, low energy consumption, and low pollution.…”