Nickel-Graphene Nanoplatelet Deposited on Carbon Fiber as Binder-Free Electrode for Electrochemical Supercapacitor Application

Abstract

A binder-free process for the electrode preparation for supercapacitor application was suggested by drop casting graphene nanoplatelets on a carbon fiber (GnP@CF) followed by electrodeposition of Ni nanoparticles (NPs). The microstructure of the electrode showed that Ni was homogeneously distributed over the surface of the GnP@CF. XRD analysis confirmed the cubic structure of metallic Ni NPs. The Ni-GnP@CF electrode showed excellent pseudocapacitive behavior in alkaline solution by exhibiting a specific capacitance of 480 F/g at 1.0 A/g, while it was 375 F/g for Ni@CF. The low value of series resistance of Ni-GnP@CF (1 Ω) was attributed to the high capacitance. The enhanced capacitance of the electrode could be correlated to the highly nanoporous structure of the composite material, synergetic effect of the electrical double layer charge-storage properties of graphene, and the pseudocapacitive nature of Ni NPs.

Cellulose Nanofiber Composite with Bimetallic Zeolite Imidazole Framework for Electrochemical Supercapacitors

“…Supercapacitors, an essential group of electric energy storage systems, link the space between conventional capacitors and batteries [8]. Typically, supercapacitors are divided into two categories, namely, electrical double-layer capacitors (EDLCs) and pseudocapacitors, based on the charge storage mechanism and the active materials employed [9][10][11][12][13].…”

One-step and room-temperature fabrication of carbon nanocomposites including Ni nanoparticles for supercapacitor electrodes

“…The formation of a Ni(OH) 2 layer, which was also conrmed by O1s spectra, [89][90][91][92] would be due to the adsorbed water molecules or hydroxyl group. 29 This layer, which is like a natural contamination due to exposure to air, was so thin that it was removed readily by the light sputterremoval. Two C1s peaks are prominent aer light sputtering, namely, peaks at 284.8 and 283.5 eV.…”

MOFs-Graphene Composites Synthesis and Application for Electrochemical Supercapacitor: A Review

“…Batteries can provide a higher energy density; however, the rate capability of the batteries is kinetically limited by the slow redox processes and the slow ion transfer through the electrode-active materials; thus, the power density of batteries is usually poor. The energy-storage mechanisms of the Sc involve two-step processes: the first is related to the electrochemical double-layer capacitance (EDLC) based on the physical adsorption of charges at the solid-liquid interface and the second is associated with the pseudocapacitance based on the redox reaction on the surface of electrode materials [2][3][4][5][6].…”