β-Ni(OH)2纳米线的相转化法制备及电化学性能

doi:10.7503/cjcu20160511

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (2): 261.doi: 10.7503/cjcu20160511

β-Ni(OH)₂纳米线的相转化法制备及电化学性能

李兴盛, 赫文秀(), 张永强, 于慧颖, 李子庆

内蒙古科技大学化学与化工学院, 包头 014010

收稿日期:2016-07-18 出版日期:2017-02-10 发布日期:2017-01-12
作者简介:联系人简介: 赫文秀, 女, 博士, 教授, 主要从事镍氢电池正极材料研究. E-mail: nmghwx@sina.com
基金资助:
内蒙古自然科学基金(批准号: 2014MS0523, 2015MS0208)、内蒙古自治区高等学校青年科技英才计划项目(批准号: NJYT-14-A08)和包头市科技计划项目(批准号: 2015C2004-1)资助

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

LI Xingsheng, HE Wenxiu^*(), ZHANG Yongqiang, YU Huiying, LI Ziqing

School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology,Baotou 014010, China

Received:2016-07-18 Online:2017-02-10 Published:2017-01-12
Contact: HE Wenxiu E-mail:nmghwx@sina.com
Supported by:
† Supported by the Natural Science Foundation of Inner Mongolia, China(Nos.2014MS0523, 2015MS0208), the Youth Science and Techno-logy Talents Project of Inner Mongolia Education Department, China(No.NJYT-14-A08) and the Science and Technology Planning Programs of Baotou City, China(No.2015C2004-1)

摘要/Abstract

摘要：

采用简单的相转化方法合成出直径为20~30 nm、长度为几微米的β-Ni(OH)₂纳米线. 利用XRD和FESEM表征了样品的结构和形貌, 并采用循环伏安法、恒流充放电和交流阻抗谱等测试了样品的电化学性能. 结果表明, 在氢氧化钠溶液中, 水热时间为30 min时, Paraotwayite型α-Ni(OH)₂纳米线转化为β-Ni(OH)₂纳米线. 在不同扫描速率下, 电极材料α-Ni(OH)₂和β-Ni(OH)₂纳米线的可逆性和倍率性能均优于β-Ni(OH)₂纳米片.

关键词: β-氢氧化镍纳米线, 相转化, 水热合成, 电化学性能

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

中图分类号:

O646
O657

TrendMD:

李兴盛, 赫文秀, 张永强, 于慧颖, 李子庆. β-Ni(OH)₂纳米线的相转化法制备及电化学性能. 高等学校化学学报, 2017, 38(2): 261.

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

图/表 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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β-Ni(OH)₂纳米线的相转化法制备及电化学性能

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

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