May 3D nickel foam electrode be the promising choice for supercapacitors?

Abstract

The manganese oxide (MnO 2 ) nanowires and cobalt hydroxide (Co(OH) 2 ) nanosheets are successfully electrodeposited on nickel foam (NF), respectively (referred to as MnO 2 /NF and Co(OH) 2 /NF electrode hereinafter). Both electrodes show higher specific capacitance (C s ) and more excellent rate performance than that of most reported corresponding materials. In addition, our previous study of Ni(OH) 2 /NF electrodes also exhibited conspicuous results. Combined with the outstanding properties of NF, it is noticeable that the NF electrodes may be a promising choice for supercapacitors.

One pot low-temperature growth of hierarchical δ-MnO2 nanosheets on nickel foam for supercapacitor applications

“…(1). The specific capacitance gradually decreases with the increase of scan rates, since at high scan rates, the electrolyte ions cannot be fully accessible to the interior surfaces of the electrodes due to the reduced diffusion time and only the outer active surface is utilized for charge storage [32]. Fig.…”

Materials and fabrication of electrode scaffolds for deposition of MnO2 and their true performance in supercapacitors

“…Almost all the influences of any other factors on the MnO 2 deposition could be reflected by the changes of deposition potential and current density. By understanding the influences of deposition parameters on the morphology evolution of MnO 2 deposits, MnO 2 with various nanostructures could be synthesized without any assist of template [27,38,171,216,226,227]. Wei et al ascribed the influences of deposition parameters on the evolution of MnO 2 morphology to the supersaturation ratio of electrolyte components (Mn 2þ and OH À for MnO 2 anodic deposition) at the electrode/electrolyte interface [216].…”

Composite Electrodes Made from Carbon Cloth as Supercapacitor Material and Manganese and Cobalt Oxide as Battery One

“…One peak at a voltage close to that observed in our sample, the other peak at higher voltage, ca. 0.3-0.4 V. 43,[58][59][60]63 Looking for the latter redox peak, the CV was extended to higher voltages but decomposition of water above 0.2 V prevented us the observation of this high voltage peak. The CV of the samples having the two oxides (samples MnCo50, MnCo and CoMn) show two redox peaks coming up from the two redox peaks of Mn oxide and the one redox peak of Co oxide, the latter overlapping with one of the Mn oxide peak.…”

“…44 This compound is a p-type semiconductor and shows an electrical conductivity of the order of 10 −3 S cm −1 , 45 which is much higher than the electrical conductivity of MnO 2 · xH 2 O. 3 The Co oxide has been prepared by chemical 43,[47][48][49][50][51][52] or electrochemical route 42,[53][54][55][56][57][58][59][60][61][62][63] on several substrates, usually metallic substrates. Regarding the two oxides together, there * Electrochemical Society Member.…”