Preparation by Phase Transformation Method and Electrochemical Performance of β-Ni(OH)2 Nanowires†

doi:10.7503/cjcu20160511

Abstract

Abstract:

β-Nickel hydroxide nanowires with diameters of 20—30 nm and lengths up to several micrometers were prepared via a simple phase transformation method. The structure and morphology of the samples were characterized using X-ray powder diffraction(XRD) and field emission scanning electron microscopy(FESEM). The electrochemical performances were measured using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The results show that Paraotwayite type α-nickel hydroxide nanowires have successfully transformed to β-nickel hydroxide nanowires in sodium hydroxide solution after being hydrothemally treated for 30 min. The reversibility and rate performance of electrode materials α-nickel hydroxide and β-nickel hydroxide nanowires are superior to those of β-nickel hydroxide nanosheets at different scan rates.

Key words: β-Nickel hydroxide nanowires, Phase transformation, Hydrothermal synthesis, Electochemical performance

CLC Number:

O646
O657

TrendMD:

LI Xingsheng, HE Wenxiu, ZHANG Yongqiang, YU Huiying, LI Ziqing. Preparation by Phase Transformation Method and Electrochemical Performance of β-Ni(OH)₂ Nanowires^†[J]. Chem. J. Chinese Universities, 2017, 38(2): 261.

Figures/Tables 8

Fig.1 XRD pattern of Ni(OH)2 samples

Fig.2 SEM images of Ni(OH)2 samples(A) α-Ni(OH)2 nanowires; (B, C) β-Ni(OH)2 nanowires; (D) β-Ni(OH)2 nanosheets.

Fig.3 CV curves of Ni(OH)2 samples at scan rate of 1 mV/s(A) and CV curves of α-Ni(OH)2 nanowires(B), β-Ni(OH)2 nanowires(C) and β-Ni(OH)2 nanosheets(D) at different scan rates

Table 1 Characteristic electrochemical parameters of CV curves

Sample	1 mV/s			5 mV/s			10 mV/s			20 mV/s			50 mV/s
Sample	E_O/ mV	E_R/ mV	ΔΕ/ mV	E_O/ mV	E_R/ mV	ΔΕ/ mV	E_O/ mV	E_R/ mV	ΔΕ/ mV	E_O/ mV	E_R/ mV	ΔΕ/ mV	E_O/ mV	E_R/ mV	ΔΕ/ mV
α-Ni(OH)₂ nanowires	371	189	182	386	195	191	405	196	209	428	187	241	476	165	291
β-Ni(OH)₂ nanowires	374	173	201	403	184	209	441	179	262	448	147	301	498	143	355
β-Ni(OH)₂ nanosheets	336	131	205	351	124	227	379	109	270	500	107	393	500	89	411

Fig.4 Cycling stability curves of Ni(OH)2 samples at different discharge ratesa. α-Ni(OH)2 nanowires; b. β-Ni(OH)2 nanowires; c. β-Ni(OH)2 nanosheets.

Table 2 Discharge specific capacitances of electrode materials fabricated with Ni(OH)2

Electrode material	Discharge rate or current density	Specific capacitance(mA·h·g^-1)	Ref.
α-Ni(OH)₂	0.2C	301.4	[28]
β-Ni(OH)₂	50 mA/g	250.3	[29]
α-Ni(OH)₂ nanowires	0.2C	300.3	This work
β-Ni(OH)₂ nanowires	0.2C	266.8	This work

Fig.5 Charge-discharge curves of β-Ni(OH)2 nanowires at different discharge rates

Fig.6 Electrochemical impedance spectroscopy of Ni(OH)2 samplesa. α-Ni(OH)2 nanowires; b. β-Ni(OH)2 nanowires; c. β-Ni(OH)2 nanosheets.

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Preparation by Phase Transformation Method and Electrochemical Performance of β-Ni(OH)₂ Nanowires^†

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