Effects of deposition temperature and annealing temperature on the morphology and electrochemical capacitance of Ni(OH)2 thin films

Yang, Guangwu; Wu, Yunqiang; Wang, Baoli; Guo, Wenyue; Ren, Zhaoyan; Bu, Zhongheng; Miao, Chao; Li, Hu‐Lin

doi:10.1007/s10008-012-1818-0

Cited by 7 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…220 Yang et al reported that annealing a-Ni(OH) 2 lms on Ni foam at 100 C delivered a specic capacitance of 2447 F g À1 . 221 It is supposed that the improved capacitance resulted from removal of physically absorbed water in a-Ni(OH) 2 . Yu et al found that ower-like NiO/a-Ni(OH) 2 composite had superior pseudocapacitive performance over individual a-Ni(OH) 2 and NiO, but poor electronic conductivity hindered its capacitance retention at high current density, where the composite was obtained by heating a-Ni(OH) 2 at 250 C for different times.…”

Section: A-nickel Hydroxidementioning

confidence: 99%

Recent development of metal hydroxides as electrode material of electrochemical capacitors

2014

View full text Add to dashboard Cite

show abstract

Section: A-nickel Hydroxidementioning

confidence: 99%

Recent development of metal hydroxides as electrode material of electrochemical capacitors

2014

View full text Add to dashboard Cite

show abstract

“…On the basis of previous reports and our research results, the surface morphology of Ni(OH) 2 prepared through electrodeposition easily presents the dispersive or agglomerative particles at ambient temperature due to the relatively low rate of reaction. 37,[39][40][41][42] While, under the same preparation conditions, it is stable for Co(OH) 2 to form typical hexagonal sheet-like structures. [43][44][45][46] As a result, it can be concluded that the formation of the surface morphology of Ni c Co 1Àc oxides fabricated by our synthesis strategy was predominated by the Co amount applied during the synthesis.…”

Section: Surface Morphologymentioning

confidence: 99%

Controllable synthesis of 3D NiχCo1−χ oxides with different morphologies for high-capacity supercapacitors

et al. 2013

View full text Add to dashboard Cite

3D Ni c Co 1Àc oxides with different morphologies for high-capacity supercapacitors were controllably synthesized via an electrodeposition method combined with a simple post annealing process. The synthesis involves the co-electrodeposition of the bimetallic (Ni, Co) hydroxide precursor on a nickel foam scaffold and subsequent thermal transformation to Ni c Co 1Àc oxides. The crystalline structure, morphology and electrochemical performance of the 3D Ni c Co 1Àc oxides can be readily manipulated by simply varying the Co/Ni molar ratio in the electrodeposition electrolyte. With the increase of the Co/Ni molar ratio, the characteristic peak intensities and the signal sites were gradually changed from a NiO crystal dominant structure to NiCo 2 O 4 and finally to a Co 3 O 4 dominant structure. Moreover, the morphology also can be controlled by adjusting the Co/Ni molar ratio in the electrodepositionelectrolyte. In addition, the Ni 0.61 Co 0.39 oxide electrode shows a large specific capacitance of 1523.0 F g À1 at 2 A g À1 and 95.30% of that can be retained, even at a high current density of 30 A g À1 . The superior rate capability should be attributed to the unique 3D network-like architecture, which can enlarge the liquid-solid interfacial area, facilitate the electron and ion transport, and further increase the utilization of the active material. To demonstrate its practical application, an asymmetric supercapacitor based on the Ni 0.61 Co 0.39 oxide electrode as a positive electrode and activated carbon as a negative electrode was fabricated. Owing to the outstanding capacitive behavior of the Ni 0.61 Co 0.39 oxide electrode, the asymmetric device delivers a prominent energy density of 36.46 W h kg À1 at a power density of 142 W kg À1 , and which holds great promise for potential applications in energy storage.

show abstract

“…1a) under different potentials. Other than the conventional electrodeposition of Ni hydroxides using nickel nitrate to generate OH − by the reduction of NO 3 − (NO 3 − + 7H 2 O + 8e − → NH 4 + + 10OH − ), 38–40 the adoption of nickel sulfate as a precursor can achieve the regulation of the local pH near the electrode via the neutral HER at cathodic potentials (2H 2 O + 2e − → H 2 ↑ + 2OH − ), facilitating the deposition of Ni 2+ in the electrolyte to generate uniformly distributed black substance over NF (Fig. S1, ESI†).…”

Section: Resultsmentioning

confidence: 99%

Redox regulation of Ni hydroxides with controllable phase composition towards biomass-derived polyol electro-refinery

Gui,

Jia,

Liao

et al. 2024

Chem. Sci.

View full text Add to dashboard Cite

show abstract

Effects of deposition temperature and annealing temperature on the morphology and electrochemical capacitance of Ni(OH)2 thin films

Cited by 7 publications

References 24 publications

Recent development of metal hydroxides as electrode material of electrochemical capacitors

Recent development of metal hydroxides as electrode material of electrochemical capacitors

Controllable synthesis of 3D NiχCo1−χ oxides with different morphologies for high-capacity supercapacitors

Redox regulation of Ni hydroxides with controllable phase composition towards biomass-derived polyol electro-refinery

Contact Info

Product

Resources

About