微波水热法制备α-Ni(OH)2及其超电容性能研究

doi:10.3724/SP.J.1077.2010.01268

无机材料学报 ›› 2010, Vol. 25 ›› Issue (12): 1268-1272.DOI: 10.3724/SP.J.1077.2010.01268 CSTR: 32189.14.SP.J.1077.2010.01268

微波水热法制备α-Ni(OH)₂及其超电容性能研究

鲜青龙¹, 李娟^{1, 2}

(1. 新疆大学化学化工学院, 乌鲁木齐830046; 2. 西安交通大学理学院, 西安 710049)

收稿日期:2010-03-26 修回日期:2010-05-19 出版日期:2010-12-20 网络出版日期:2010-11-24
基金资助:
国家自然科学基金项目(20663006)

Preparation and Electrochemical Capacitance of α-Ni(OH)₂ Synthesized by Microwave-assisted Hydrothermal Method

XIAN Qing-Long¹, LI Juan ^{1, 2}

(1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China; 2. School of Science, Xi’an Jiaotong University, Xi’an 710049, China)

Received:2010-03-26 Revised:2010-05-19 Published:2010-12-20 Online:2010-11-24
Supported by:
National Nature Science Foundation of China(20663006)

摘要/Abstract

摘要： 以六水合硝酸镍为原料, 尿素为沉淀剂采用微波水热法合成了Ni(OH)₂. X射线衍射(XRD)证明材料为纯相α-Ni(OH)₂, 扫描电子显微镜(SEM)显示α-Ni(OH)₂呈现直径约0.5~3.0 μm的花球形貌, 分散较均匀, 沉淀剂的用量对花球的大小和团聚程度有影响. 采用循环伏安以及恒电流充放电等技术对材料进行了电化学性能测试. 结果表明, 当尿素与六水合硝酸镍的摩尔比为3:1时所得到的α-Ni(OH)₂具有最大的初始比电容, 而尿素与六水合硝酸镍的摩尔比为2:1时所得到的α-Ni(OH)₂具有更好的循环储能性能.

关键词: 微波水热法, α-Ni(OH)₂, 超级电容器

Abstract: Ni(OH)₂ particles were successfully prepared with Ni(NO₃)₂·6H₂O as the raw material and CO(NH₂)₂ as the precipitation agent by microwave-assisted hydrothermal method. The obtained Ni(OH)₂were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and electrochemical measurements. XRD results showed that the as-prepared Ni(OH)₂particles had the typical α-phase. The SEM images revealed that the synthesized α-Ni(OH)₂particles were well dispersed and ball-flower like with diameters of 0.5-3 μm which consisted of the aggregated flakes. Electrochemical properties were studied by cyclic voltammograms (CV) and galvanostatic charge-discharge tests in 6 mol/L KOH electrolyte. All the tests showed that the reactants ratio affected the morphologies and the electrochemical capacitance of the materials. When the molar ratio of the CO(NH₂)₂ to Ni(NO₃)₂·6H₂O was 3:1, the obtained α-Ni(OH)₂had the maximal initial special capacity; when the molar ratio was 2:1, the α-Ni(OH)₂ had the best cycle storage performance.

Key words: microwave-assisted hydrothermal method, α-Ni(OH)₂, supercapacitor

中图分类号:

O646

鲜青龙, 李娟. 微波水热法制备α-Ni(OH)₂及其超电容性能研究[J]. 无机材料学报, 2010, 25(12): 1268-1272.

XIAN Qing-Long, LI Juan. Preparation and Electrochemical Capacitance of α-Ni(OH)₂ Synthesized by Microwave-assisted Hydrothermal Method[J]. Journal of Inorganic Materials, 2010, 25(12): 1268-1272.

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微波水热法制备α-Ni(OH)₂及其超电容性能研究

Preparation and Electrochemical Capacitance of α-Ni(OH)₂ Synthesized by Microwave-assisted Hydrothermal Method

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