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Structure and electrochemical performance of Cu singly doped and Cu/Al co-doped nano-nickel hydroxide 被引量:1
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作者 包杰 朱燕娟 +4 位作者 庄义环 许庆胜 赵汝冬 刘泳林 钟浩良 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第2期445-450,共6页
Nanometer Cu singly doped and Cu/Al co-doped nickel hydroxides were synthesized by ultrasonic-assisted precipitation method. Their crystal structure, particle size, morphology, tap density and electrochemical performa... Nanometer Cu singly doped and Cu/Al co-doped nickel hydroxides were synthesized by ultrasonic-assisted precipitation method. Their crystal structure, particle size, morphology, tap density and electrochemical performance were investigated. The results show that the samples have a-phase structure with narrow particle size distribution. Cu singly doped nano-Ni(OH)2 contains irregular particles, while Cu/Al co-doped nano-Ni(OH)2 displays a quasi-spherical shape and has a relatively higher tap density. Composite electrodes were prepared by mixing 8% (mass fraction) nanometer samples with commercial micro-size spherical nickel. The charge/discharge test and cyclic voltammetry results indicate that the electrochemical performance of Cu/Al co-doped nano-Ni(OH)2 is better than that of Cu singly doped nano-Ni(OH)2, the former's discharge capacity reaches 330 mA.h/g at 0.2C, 12 mA.h/g and 91 mA.h/g larger than that of Cu singly doped sample and pure spherical nickel electrode, respectively. Moreover, the proton diffusion coefficient of Cu/Al co-doped sample is 52.3% larger than that of Cu singly doped sample. 展开更多
关键词 nano-ni(oh)2 ultrasonic-assisted precipitation doping electrochemical performance
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The Impact of Nickel Source/Doping Elements/Buffer on the Structure of Ni(OH)_2 被引量:1
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作者 许庆胜 朱燕娟 +4 位作者 HAN Quanyong LUO Jie MIAO Chengcheng ZHANG Wei ZHANG Chunhua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第1期44-48,共5页
The nano-nickel hydroxide samples were prepared by means of ultrasonic-assisted precipitation and the impact of source/doping element/buffer on the structure of Ni(OH): was studied. The results of XRD, IR and TEM t... The nano-nickel hydroxide samples were prepared by means of ultrasonic-assisted precipitation and the impact of source/doping element/buffer on the structure of Ni(OH): was studied. The results of XRD, IR and TEM testing clearly revealed that larger anionic radius of the nickel sources or the buffer solution was conducive to the formation of α-Ni(OH)2. The proportion of α-Ni(OH): samples doped with two elements was larger than that doped with single element. Additionally, speciation, valence as well as the radius of doping ions can directly affect the phase of Ni(OH)2. 展开更多
关键词 multiphase nano-ni(oh): ultrasonic-assisted precipitation Y/Cu-doped FTIR XRD TEM
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超声波功率和pH值对Y掺杂纳米Ni(OH)_2结构与性能的影响 被引量:2
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作者 伍尚改 朱燕娟 +5 位作者 张仲举 周焯均 叶贤聪 郑汉忠 林晓然 包杰 《材料工程》 EI CAS CSCD 北大核心 2011年第6期27-31,共5页
采用超声波沉淀法制备了Y掺杂纳米Ni(OH)2,研究了超声波功率和溶液pH值对材料结构、粒径及电化学性能的影响。结果表明,不同超声波功率制备的样品均为α和β混合相结构,其中α-Ni(OH)2的比例随功率增大先增加后减少,粒径随功率增大先减... 采用超声波沉淀法制备了Y掺杂纳米Ni(OH)2,研究了超声波功率和溶液pH值对材料结构、粒径及电化学性能的影响。结果表明,不同超声波功率制备的样品均为α和β混合相结构,其中α-Ni(OH)2的比例随功率增大先增加后减少,粒径随功率增大先减小后增大。溶液pH值对Ni(OH)2晶相形成起重要作用,较低的pH值有利于α-Ni(OH)2生成,晶粒粒径随pH值增大而增大,但pH值对电极反应的可逆性影响不大。将样品以8%(质量分数)与工业用微米级球镍混合制成复合电极,其电极的放电比容量随功率增大先提高后下降。功率为60W,pH值为9的样品,其相应电极的充电效率最高,放电比容量最大,0.5C倍率下高达358mAh/g。 展开更多
关键词 超声波沉淀法 超声波功率 PH值 Y掺杂 混合相纳米Ni(oh)2
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制备条件对Ni(OH)_2晶相的影响 被引量:1
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作者 许庆胜 朱燕娟 +3 位作者 赵汝冬 韩全勇 庄义环 曾逸廷 《人工晶体学报》 EI CAS CSCD 北大核心 2012年第5期1232-1236,共5页
采用超声波辅助沉淀法在不同条件下制备了多组纳米氢氧化镍,用X射线衍射仪对样品晶相结构进行了测试分析。结果表明,反应条件如镍源、掺杂元素、缓冲剂、制备方法都对Ni(OH)2晶相有较大影响。镍源或缓冲剂较大的阴离子半径有助于α-Ni(O... 采用超声波辅助沉淀法在不同条件下制备了多组纳米氢氧化镍,用X射线衍射仪对样品晶相结构进行了测试分析。结果表明,反应条件如镍源、掺杂元素、缓冲剂、制备方法都对Ni(OH)2晶相有较大影响。镍源或缓冲剂较大的阴离子半径有助于α-Ni(OH)2的形成;二元掺杂比单元掺杂时其产物α-Ni(OH)2比例高;掺杂离子的种类、半径、价态都直接影响Ni(OH)2的晶相。本文还对微乳液法和超声波辅助沉淀法制备的样品进行了对比分析。 展开更多
关键词 多相纳米Ni(oh)2 超声波辅助沉淀法 掺杂元素 缓冲剂
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Study on the preparation and electrochemical performance of rare earth doped nano-Ni(OH)_2 被引量:3
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作者 叶贤聪 朱燕娟 +4 位作者 伍尚改 张仲举 周焯均 郑汉忠 林晓然 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第8期787-792,共6页
Multiphase nano-Ni(OH)2 doped with Y or La was prepared by supersonic co-precipitation method. The crystal morphology, structure and particle size were characterized by transmission electron microscopy (TEM), X-ra... Multiphase nano-Ni(OH)2 doped with Y or La was prepared by supersonic co-precipitation method. The crystal morphology, structure and particle size were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and particle size distribution (PSD). The electrochemical performance of samples was investigated by electrochemical workstation and battery tested system. The results indicated that micro-morphology and grain size were changed with the changing of supersonic power, pH values and doping elements. The morphology of Y doped sample was from the flake-like to the needle-like with the increase of supersonic power; Particles were from quasi-spherical particles into needle-like with the increase of pH values; As the supersonic power increased, the proportion of α-Ni(OH)2 increased initially and then decreased. pH value was very important to the formation of crystalline phase. Lower pH value was beneficial to the formation of α-Ni(OH)2. However, the pH values had a slight effect on the reaction reversibility. Complex electrodes were prepared by mixing 8 wt.% nickel hydroxides with commercial micro-size spherical nickel. The discharge capacity of electrodes increased initially and then decreased with the increase of supersonic power. When the supersonic power was 60 W and the pH value was 9, the sample had the largest dis-charge capacity (358 mAh/g) at 0.5 C rate, which was 122.7 and 76 mAh/g higher than the spherical nickel electrode and La doped sample electrode, respectively. 展开更多
关键词 supersonic co-precipitation method power of supersonic pH value Y or La doped multiphase nano-ni(oh)2 rare earths
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Phase and particle of Y-doped Ni(OH)_2 prepared from different nickel sources and Na_2CO_3 amount 被引量:1
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作者 Qing-Sheng Xu Yan-Juan Zhu +4 位作者 Liang-Guo Huang Jie Luo Zhong-Ju Zhang Cheng-Cheng Miao Hu Ye 《Rare Metals》 SCIE EI CAS CSCD 2014年第2期219-224,共6页
Multiple nano-sized a-Ni(OH)2was synthesized by ultrasonic-assisted precipitation under different conditions. The crystal structure and particle size distribution of the sample were characterized with X-ray diffract... Multiple nano-sized a-Ni(OH)2was synthesized by ultrasonic-assisted precipitation under different conditions. The crystal structure and particle size distribution of the sample were characterized with X-ray diffraction(XRD), infrared spectroscopy, and laser particle size analyzer(PSA). The results show that the samples are anisotropic polycrystalline of a and b Ni(OH)2, and the ratio of a and b changes with the difference of nickel source, resulting in the largest ratio of a-Ni(OH)2using nickel nitrate as reactant. Larger amount of Na2CO3is conducive to the formation of a-Ni(OH)2; while the resultant phases are all b with the same conditions but no doping. The results of PSD indicate that the samples are about 100–120 nm in size, and the sample with nickel sulfate as nickel source has the minimum particle size. The three ions of nickel source appear in the absorption peaks in the Fourier transform infrared spectrum showing that the ions change the crystal structure of Ni(OH)2. EDS testing shows that Y and anion distribute in the lattice of aNi(OH)2uniformly. 展开更多
关键词 multiphase nano-ni(oh)2 Y-doping Nickel source
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