Enhanced cycle performance of hierarchical porous sphere MnCo2O4 for asymmetric supercapacitors

Asymmetric supercapacitor of functionalised electrospun carbon fibers/poly(3,4-ethylenedioxythiophene)/manganese oxide//activated carbon with superior electrochemical performance

“…However, a small hump observed at 0.56 V is attributed to the redox reaction of the oxygenated functional groups at the surface of the electrode 36 and pseudocapacitance of PEDOT and MnO 2 . The f -CNFs/PEDOT/MnO 2 electrode exhibits a larger enclosed CV area compared with AC, demonstrating higher charge capacity 37 and higher specific capacitance 38 . For AC, the electrode contributes the potential window from −0.6 to 0 V (vs. Ag/AgCl) with symmetrical rectangular CV curve, indicating an ideal EDLC feature 39 with good rate capability 21 .…”

Transition Metal Oxide Electrode Materials for Supercapacitors: A Review of Recent Developments

“…Compared with carbon materials, pseudocapacitive materials like metal oxides and organic conductive materials have higher specific capacitance owing to redox reaction on the surface of the material. In addition, ternary metal oxides have more active sites and faster redox reactions than single metal oxides, which become one of the materials to replace RuO 2 [ 53 , 172 , 173 , 174 ]. As the hotspots of mixed transition metal oxides, the transition metal molybdates have attracted much attention because of their advantages including natural abundance, high theoretical specific capacitance, and low costs [ 175 ].…”

Control of the interface graphitized/amorphous carbon of biomass-derived carbon microspheres for symmetric supercapacitors

“…The sludge mixture was pressed into a sheet and subsequently cut into 12 mm electrode pieces using a puncher and dried at 80 °C for 1 h. The mass loading of the electrodes is 2.21 mg/cm 2 . The symmetric supercapacitor (SS) was assembled by assembling two identical electrodes using KOH (6 M) as the electrolyte 4 . The electrochemical performance of supercapacitor battery SS was examined by galvanostatic charge-discharge test (GCD) test in 0-0.8V, cyclic voltammetry test (CV) with different scan rates (10 ~ 100 mV/s), and impedance measurements (EIS) from 0.01 Hz and 100 kHz with an amplitude of 5mv on the electrochemical workstation (IM6).…”

“…(1) where I (A) is a current density, m (g) is the total mass of two electrodes, Δt (s) is discharge time (s), and ΔV (V) is discharge potential 4,18,19 . The energy density (E, Wh/kg) and power density (P, W/kg) of the assembled SS were calculated according to equation ( 2) and (3).…”

“…Supercapacitors, which storage energy through adsorption/desorption of electrolyte ions and/or faradaic redox reactions, possess unique merits of high power density and fast charge/discharge capability, showing promising potential as energy storage devices for portable and stationary electronics 1-3 . However, the relatively low energy density and/or unsatisfactory electrochemical stability pose large challenges in this field 4 . The adopted electrode material directly determines the energy storage capacity of supercapacitors.…”