Improved pseudocapacitive performance and cycle life of cobalt hydroxide on an electrochemically derived nano-porous Ni framework

Hydrothermal-synthesized Co(OH)2 nanocone arrays for supercapacitor application

“…Note that the CV curves consist of two pairs of strong redox couples P1/P4 and P2/P3, indicating that the capacitance characteristics are governed by Faradaic reactions, distinct from that of the electric double-layer capacitance, which would produce a CV curve close to an ideal rectangular shape. The redox couple P1/P4 is due to the change between Co(OH) 2 and CoOOH, which can be simply illustrated as follows [21,22]. …”

“…The redox couple P2/P3 at higher potential is assigned to the conversion between CoOOH and CoO 2 , illustrated as follows [21,22].…”

Synthesis and supercapacitance of flower-like Co(OH)2 hierarchical superstructures self-assembled by mesoporous nanobelts

“…4a. Obviously, two pairs of redox peaks (designated as O/R and O′/R′), at various scan rates as indicated, demonstrate their typical Faradaic pseudocapacitive characteristics [9][10][11][12][13][14][15][16][17], as presented by the following two equations: Specifically, the peak O is related to the oxidation of Co (II) to Co(III)OOH, and the peak R is for the reverse process, as shown in Eq. 1.…”

“…Recently, electroactive Co (OH) 2 as a good candidate has spurred enormous research in the ECs field, because of its good electrochemical capacitance performance [9][10][11][12][13][14][15][16][17]. However, the reported SCs for Co(OH) 2 are much less than its theoretic SC of 3,650 Fg −1 [9][10][11][12][13][14][15], particularly, at high rates. The next logical strategy is exploring efficient ways to enhance the electrochemical utilization of cobalt hydroxide and enhance its SC at high rates.…”

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

“…Cobalt hydroxide has been attracting much attention for energy storage applications due to its high theoretical specific capacitance [1][2][3][4]. For example, Gong et al [5] prepared Co(OH) 2 sheets via a ball-milling method, whose average specific capacitance was 599 F/g at a scan rate of 2 mV/s.…”