共查询到19条相似文献,搜索用时 300 毫秒
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利用二次阳极氧化法制备孔洞分布均匀、孔径基本一致、孔口呈六边形的多孔阳极化氧化铝(AAO)模板。在不剥离膜的条件下,电腐蚀阻挡层,保留原有铝基底,起电极作用。在离子液体中,利用电化学工作站结合不同TbFe配比的电镀液,摸索合适的电镀液配比,成功电沉积制备了TbFe合金纳米线。用SEM、XRD和EDS对纳米线阵列微观形貌和结构进行分析。SEM观测表明,TbFe合金纳米线排列有序,尺寸一致;XRD谱显示所得产物为非晶态的TbFe合金纳米线;EDS测定表明沉积物为TbFe合金纳米线。振动样品磁强计检测表明,所制得的纳米线具有较好的磁学性能。 相似文献
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为了改善锂离子电池用Sn-Sb合金负极的循环稳定性并提高其首次库仑效率,采用电化学共沉积法在Cu集流体上制备了锂离子电池用Sn-Sb合金薄膜负极材料.通过能量散射光谱(EDS)、X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)及恒电流充放电实验,研究了电流密度和电沉积时间对Sn-Sb合金相组分、结构、颗粒形貌和电化学性能的影响.电化学测试表明:在电流密度为5 mA/cm2,沉积时间为30 min时,得到的产物中金属间化合物(Sn-Sb相)的含量最高,所制备电极的电化学性能较好. 相似文献
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采用在泡沫镍基底材料上电化学沉积银催化剂的方法,制备了铝-过氧化氢燃料电池阴极。通过扫描电镜(SEM)、X射线衍射分析(XRD)以及电化学测试等方法对电极的微观结构和性能进行了研究。实验结果表明,以泡沫镍基底沉积银催化剂的电极提高了过氧化氢还原反应的催化活性,具有很好的综合电化学性能。电极极化电位为-1.0(Vvs.Ag/AgCl)时,阴极电流密度可达1300mA/cm2。在工作温度为45℃条件下,该方法制备的电催化阴极可使铝-过氧化氢电池最大比功率达到450mW/cm2。 相似文献
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用化学气相沉积法制备了多壁碳纳米管,经扫描电镜分析得其具有较好的形貌和结构.研究了该多壁碳纳米管对波长1 064 nm激光的光限幅性质,发现该样品具有非常明显的光限幅特性,激发态吸收截面为σE=3.32×10-17cm2.应用Z-扫描(Z-scan)技术研究表明,碳纳米管的光限幅机制主要为激发态吸收. 相似文献
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纳米科学技术在化学电源领域的新进展 总被引:29,自引:4,他引:25
90年代纳米科学技术特别是纳米材料的应用已经扩展到化学电源领域。本文举例介绍了用于镍-碱性电池的纳米相氢氧化镍、AB5型纳米晶态贮氢合金以及在锂离子电池中用作阴极材料的锰钡矿型MnO2纳米纤维、聚吡咯包覆尖晶石型LiMn2O4纳米管、聚吡咯/V2O5纳米复合材料,用作阳极材料的碳纳米管、纳米掺杂碳材料、纳米二氧化锡,用作固态电解质的纳米填料修饰聚氧乙烯基复合材料等几种新型纳米化学电源材料的制备、结构、形貌以及电化学性质,并且简要介绍了厦门大学化学电源研究中心纳米材料的研究进展。 相似文献
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锂离子电池正极材料二巯基噻二唑的研究进展 总被引:3,自引:0,他引:3
二巯基噻二唑(DMcT)作为锂离子电池正极材料,具有容量高、寿命长、制备简便等优点,但它在室温下的反应速度较慢.介绍DMcT在锂离子电池中的充放电机理及利用聚苯胺、聚吡咯、聚3,4-乙撑二氧噻吩、聚邻甲基苯胺、聚N-甲基化苯胺、聚3-烷基酯-4-甲基吡咯、聚3-丁基酯-4-甲基吡咯、聚二巯基噻二唑、金属离子以及金属纳米粉等电催化剂对DMcT进行改性的研究进展,以及电催化剂对DMcT电化学性能的影响.通过这些改性,DMcT的放电容量、正极电流、循环寿命都得到了改善. 相似文献
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以LiH2PO4作为Li源和P源,FeC2O4·2H2O作为铁源,通过溶剂热法制得片状LiFePO4.采用原位氧化聚合方法对磷酸铁锂进行聚吡咯包覆改性,同时在原位聚合过程中,表面活性剂的加入对产物结构和性能的影响也得到了研究.所得LiFePO4产物分别采用X-射线衍射(XRD),傅里叶转换红外光谱(FT-IR),热重-示差分析(TGA-DSC),场发射扫描电镜(FE-SEM),研究了LiFePO4包覆聚吡咯前后形貌和结构的变化.采用交流阻抗方法和循环充放电测试研究了产物的电化学性能.结果表明:聚吡咯包覆的LiFePO4(未经SDBS掺杂)的首次放电比容量达到132.2 mAh/g.SDBS掺杂后,首次放电比容量达到142.7 mAh/g,当倍率为1C时,其放电比容量为105.6 mAh/g. 相似文献
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为了改善锂离子电池锡负极的循环性能,将碳纳米管与锡负极复合,以铜片为基底,采用复合电沉积的方式制备了含有不同直径碳纳米管的Sn-CNTs复合电极,并对其表面形貌,成分与结构分别进行了扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、能量散射光谱(EDS)分析。最后,组装模拟电池并测试其电化学性能。结果表明:制备的电极表面不规则,可明显观察到CNTs与Sn颗粒,且当CNTs直径为10~20 nm时,其在镀层内含量最高,制备的Sn-CNTs复合电极循环性能最佳,经过50次充放电循环后,其比容量仍能达到420 m Ah/g。 相似文献
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纳米添加剂对镍氢电池正极电化学性能的影响 总被引:1,自引:0,他引:1
采用制备的纳米氧化锌(均匀沉淀法)和碳纳米管(化学气相沉积法)作为正极添加剂,掺杂制备两种不同正极极片。研究了正极中添加不同含量在不同放电制度下对MH-Ni电池电化学性能的影响。结果表明,在30 mA/g恒电流密度放电条件下,添加纳米氧化锌(ZnO)的模拟电池有助于提高放电性能,第80次循环时添加量为2%的放电比容量最高为259.2 mAh/g;但在60 mA/g恒电流密度放电条件下,模拟电池中添加碳纳米管(CNTs)的作用比较明显,添加量为1%CNTs的在第80次循环时放电比容量为260.3 mAh/g,而且放电平台比较平稳。 相似文献
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Mitsuyoshi Onoda Yoshiyuki Kato Hirokazu Shonaka Kazuya Tada 《Electrical Engineering in Japan》2004,149(4):7-13
We have investigated a method of preparing a large‐size anisotropic polypyrrole (PPy) film using a slab vessel consisting of poly(tetrafluoroethylene) (PTFE) walls as well as its actuation abilities. The PPy film can be grown along one side of the PTFE walls and exhibits morphological anisotropy of the PPy packing density along the thickness direction. A piece bends in a regular direction (the surface in contact with the PTFE wall) and reverts during a redox cycle without the use of any additional processes such as lamination. The actuation properties of the anisotropic PPy actuator strongly depend on the size of the cation in the driving electrolyte, and the bending behavior of this actuator at room temperature becomes slower for larger cations. On investigating the temperature dependence of actuation properties, the arrival time of the actuator (the time required for the tip of the actuator to touch the electrolyte surface upon stepwise potential change) was found to become shorter in all electrolyte solutions with different electrolytes. This result can be understood in terms of the thermally activated microscopic movement of the PPy main chains. Such behavior based on electrochemical stimulus not only provides information related to ionic transfer and storage but also suggests that the anisotropic PPy film can be put to practical use as an electrochemical actuator for artificial muscle which directly converts electrical energy into mechanical energy. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 149(4): 7–13, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20066 相似文献
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This paper reports on silicon nanowire growth on oxidized silicon substrates using different approaches for gold catalyst
deposition. The gold coated surfaces and the resulting nanowires were characterized using scanning electron microscopy. The
gold catalysts were made up of gold nanoparticles (50 nm diameter), which were either dispersed or spotted at different concentrations
using a robot, or were formed on a patterned Si/SiO2 substrate by metal evaporation (63 nm diameter). The subsequent silicon nanowire growth was accomplished by CVD decomposition
of silane gas (SiH4) at high temperature (400–500°C) in a vapor-liquid-solid (VLS) process. Under these conditions, a high density of silicon nanowires (SiNWs) was achieved
on the oxidized silicon surfaces, but the distribution of the nanowires was found to be inhomogeneous in the case of the gold
nanoparticles. Such result is attributed to the aggregation of the nanoparticles during the growth process. Alternatively,
when gold nanodot catalysts were lithographically patterned on the surface, the nanowires were obtained in the patterned regions. 相似文献
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袁艳红 《上海电机学院学报》2011,14(2):123-126
用化学气相沉积法(CVD)制备了多壁碳纳米管(MWNTs),并用扫描电镜(SEM)测量了纳米管的形貌。在室温条件下,测量了样品的拉曼光谱和吸收光谱:拉曼光谱表明样品含有较多缺陷,吸收光谱说明了该样品有光致发光的通道。测量了在不同波长光的激发下样品的光致发光光谱:当用550 nm的光激发多壁碳纳米管时,观察到峰值强度弱、峰值波长约为820 nm的带状光谱;当激发波长增加到580 nm时,发射光谱变为峰值波长约为868 nm、峰值强度较强、形状相似的光谱;当激发光波长增加到600 nm时,观察到峰值强度强、峰值波长约为900 nm的带状光谱。 相似文献
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采用化学气相沉积法,在反应温度分别为980℃和1040℃时制备了多壁碳纳米管(MWNTs)样品,并采用扫描电镜和拉曼光谱对样品进行了表征;结果表明,当反应温度为9800C时,制备的碳纳米管结构缺陷更多。使用波长为350nm的光激发2种样品并测量它们的光致发光光谱。发射峰值约在550nm处,反应温度为980℃时制备的碳纳米管的发射光谱的光强较强。 相似文献
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In this paper, we present a room temperature two-step electrochemical process for the deposition of large area (∼10 cm2) nanocrystalline ferrite thin films. As an example, the optimized conditions for the deposition of copper, nickel and cobalt ferrites on different conducting substrates and their physical properties are reviewed. The films are spinel in crystal structure and well adherent to the substrates. The electrical and magnetic properties of the films after annealing are comparable to the properties obtained with the films formed with other physical and chemical techniques. 相似文献