Enhancing capacitance behaviour of CoOOH nanostructures using transition metal dopants by ambient oxidation

Abstract

Cobalt hydrate and doped binary Co0.9M0.1OOH (M = Ni, Mn, Fe) nanorings of 100–300 nm were fabricated in solution through a facile ambient oxidation method. A transformation from Co0.9Ni0.1(OH)2 nanodiscs to hollow Co0.9Ni0.1OOH nanorings was observed with prolonged reaction time. Core-shell nanodiscs have elemental segregation with a Co(OH)2 core and Ni(OH)2 shell. Co0.9Ni0.1OOH nanorings displayed a higher electrochemical capacitance than Mn and Fe doped nanorings materials or materials with disc-like geometries.

Cobalt oxysulphide/hydroxide nanosheets with dual properties based on electrochromism and a charge storage mechanism

“…2a 2 and CoO(OH) has also previously been reported. 14 In addition, a ratio between Co : S was calculated by wavelength dispersive X-ray uorescence (WDXRF) supporting the XRD results. Generally, the as-prepared a-Co(OH) 2 lm can be obtained by the electrodeposition technique.…”

“…[17][18][19] The Co(OH) 2 can be converted into CoO(OH) during the oxidation process with the reduction of d-spacing value and the shi of the peak of (001) plane of Co(OH) 2 to (002) plane of CoO(OH). 14,16,20 The CoO(OH) is a hexagonal crystal phase of space group R3m with lattice parameters of a ¼ b ¼ 0.3183 nm, and c ¼ 1.315 nm. 15,16 The caxis of CoO(OH) clearly expands and disorders when compared with the crystal structure of Co(OH) 2 .…”

Mechanism and performance of singlet oxygen dominated peroxymonosulfate activation on CoOOH nanoparticles for 2,4-dichlorophenol degradation in water

“…supercapacitor [18][19][20] and precursor for electrode materials [21,22] in industry. It turns out that CoOOH has good electronic transmission rate.…”

A first principles study on structural, dynamical, and mechanical stability of newly predicted delafossite HCoO2 at high pressure

“…In the past few decades, materials with delafossite‐type structure have attracted a great deal of interest due to their potential applications in optoelectronic, electronic, dye sensitized solar cell, rechargeable battery electrodes, catalysis in hydrogen evolution, electrochemistry, and thermoelectricity . Delafossites are p‐type wide band gap layered structural materials, with general chemical configurations of ABO 2 and are characterised by the edge‐connected BO 2 octahedra that are stacked along the c‐axis.…”