Uniform β-Co(OH)2 disc-like nanostructures prepared by low-temperature electrochemical rout as an electrode material for supercapacitors

A highly electronic conductive cobalt nickel sulphide dendrite/quasi-spherical nanocomposite for a supercapacitor electrode with ultrahigh areal specific capacitance

“…As the active material loading increased from 2.6 to 9.3 mg cm À2 , only a slight decrease was observed at low or high current densities. To further evaluate the electrochemical performances of the Co 1.5 Ni 1.5 S 4 electrodes with different loadings, the Coulombic efficiencies (CE) of the Co 1.5 Ni 1.5 S 4 electrodes at various loadings were calculated using Equation S(4) [31] and are provided in Fig. 4c.…”

Structural evolution, magnetic properties and electrochemical response of MnCo2O4nanosheet films

“…4 presents some very broad vibration bands, particularly the not well-dened OH stretching band at about 3573 cm À1 , the weak bending mode of the interlayer water molecule at 1640 cm À1 , the bands at 1351 cm À1 and 1490 cm À1 due to the C]O vibration of absorbed CO 2 and the carbonate ions from the dissolution of CO 2 in water 38,39 and the band at 594 cm À1 arising from the metal-oxygen stretching or metal-hydroxyl bending vibration modes in hydroxides 26,27 (Table 1). 4 presents some very broad vibration bands, particularly the not well-dened OH stretching band at about 3573 cm À1 , the weak bending mode of the interlayer water molecule at 1640 cm À1 , the bands at 1351 cm À1 and 1490 cm À1 due to the C]O vibration of absorbed CO 2 and the carbonate ions from the dissolution of CO 2 in water 38,39 and the band at 594 cm À1 arising from the metal-oxygen stretching or metal-hydroxyl bending vibration modes in hydroxides 26,27 (Table 1).…”

Pine needle β-Co(OH)2 grown on Ni foam substrate for high specific capacitance and good cycling stability as advanced electrochemical pseudocapacitor materials

“…1(A) and (b)), which is in good agreement with the standard spectrum of b-Co(OH) 2 (JCPDS No. 30-0443) [11,12]. No peaks of any other phases or impurities are detected, demonstrating high purity of the asprepared b-Co(OH) 2 sample.…”

“…3(c) shows the CV of the prepared b-Co(OH) 2 /NF electrode in 2 M KOH at the scan rate of 10 mV/s. The curve owns two pairs of redox peaks p1 versus p2 and p3 versus p4 [5,11,13], indicating that the capacitance characteristics are governed by faradaic reactions, distinct from that of the electric double-layer capacitance, which will produce a CV curve close to an ideal rectangular shape. Peak p1 is due to the oxidation of Co(OH) 2 to CoOOH and peak p2 is for the reverse process; peak p3 is attributed to oxidation of CoOOH to CoO 2 , p4 is therefore ascribed to the reduction of CoO 2 to CoOOH.…”