Nano-architectured MnO2 Electrodeposited on the Cu-decorated Nickel Foam substrate as Supercapacitor Electrode with Excellent Areal Capacitance

CNT/High Mass Loading MnO2/Graphene-Grafted Carbon Cloth Electrodes for High-Energy Asymmetric Supercapacitors

“…However, the capacitance retention of the former (65.5%) is 134 times larger than that of the latter (only 0.49%) when the current density is increased from 1 to 20 mA cm −2 ( Table S2). The inferior rate performance of the MnO 2 -25/GCC electrode is attributed to the low intrinsic conductivity of MnO 2 and elongated electron transport [22], MnO 2 /CNT/carbon tape [23], MnO 2 /CNT film [24], MnO 2 /anodic aluminum oxide (AAO) [25], MnO 2 /Ni nanorod array [26], MnO 2 /Ni foil [27], MnO 2 /CC [15]. h The schematic illustration of the CNT/MnO 2 -25/GCC structure.…”

In Situ Construction of Ag/Ni(OH)2 Composite Electrode by Combining Electroless Deposition Technology with Electrodeposition

“…The O 1s spectrum ( Figure. 3e) can be deconvoluted into two peaks, one located at 531.2 eV corresponding to OHgroup and the other is ascribed to adsorbed water at 532.8 eV [22]. Among all the samples, the Ag/Ni(OH) 2 electrode has the largest enclosure area, revealing its highest specific capacity according to the equation [25]. Figure 4b shows the GCD curves of Ag/Ni(OH) 2 , Ni(OH) 2 and Ag electrode at 2 mA cm −2 .…”

“…At the same time, the AgNCs act as the bridge between the Ni(OH) 2 layer and copper substrate, favorable for electron transmission. Furthermore, AgNCs as an active component improve the conductivity of the active materials [25]; (2) the Ag-decorated copper foam substrate provides a much higher surface area for subsequent electrodeposition of Ni(OH) 2 , which keeps the active materials from conventional aggregation [31]; (3) the electrodeposition of smaller Ni(OH) 2 nanoparticles interconnected with each other on the surface of the AgNCs generates abundant space, making the electrolyte fully accessible to the internal area of the electrode. This facilitates the transmission of the electrolyte, and a full contact between the electrodes and electrolytes is ensured [25,31].…”

“…To estimate the electrochemical properties of the Ag/Ni(OH)2 electrode, CV and GCD tests were performed. Figure 4a records the CV curves of Ag/Ni(OH)2, Ni(OH)2, Ag electrode and copper substrate at the scan rate of 10 mV s −1 in 5 M NaOH aqueous solution.Among all the samples, the Ag/Ni(OH)2 electrode has the largest enclosure area, revealing its highest specific capacity according to the equation[25].Figure 4bshows the GCD curves of Ag/Ni(OH)2, Ni(OH)2 and Ag electrode at 2 mA cm −2 . Ag/Ni(OH)2 electrode shows the longest discharge time, which indicates that it has the highest pseudocapacitance.…”

One-step fabrication of electrochemically reduced graphene oxide/nickel oxide composite for binder-free supercapacitors

“…As seen from inset ofFig. 8after 2000 cycles, Rs and Rct remains approximately constant and the steeper slope of the plot at low frequency region obtained after cycling than that before cycling for hybrid electrode indicates the more obvious pseudo-capacitive behavior of the electrode after 2000 cycles[55,56].ConclusionsA simple and facile one-step electrochemical method was presented to fabricate the ERGO/NiO/NF electrode. Graphene nanosheets were also used not only to enhance the stability of NiO nanostructures but also to improve the electrical conductivity of the resulting composite electrode.…”