共查询到19条相似文献,搜索用时 109 毫秒
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乙酰胺-尿素-NaBr熔体中Gd-Ni合金的电化学制备 总被引:7,自引:0,他引:7
熔盐电解法制取稀土合金功能材料具有低成本等优点.本文选取353 K的乙酰胺-尿素-NaB r熔体,应用循环伏安法研究镍于该熔体(含0.063 mol.L-3N iC l2)、Pt、Cu电极上的还原.实验表明,N i(Ⅱ)+2 eN i(0)是一步完全不可逆反应,测得在Pt上N i(Ⅱ)的传递系数α=0.28,扩散系数D0=4.63×10-5cm2.s-1,Cu上α=0.22,D0=6.05×10-7cm2.s-1.以Cu作基体,Gd(Ⅲ)于该熔体不能单独还原为Gd(0),但可以被N i(Ⅱ)诱导共沉积.由恒电位法电解得到的Gd-N i合金,Gd(0)的含量随电解电位、Gd(Ⅲ)/N i(Ⅱ)摩尔比及电解时间的变化而变化.控制电解电位为-0.75 V,Gd(Ⅲ)/N i(Ⅱ)摩尔比为1∶1,电解20 m in.所得合金膜是非晶态的. 相似文献
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研究了MPc(M=CO、Fe)在异丙苯液相氧化中的催化作用,并考察了Py、bPy和菲绕啉等含N配体对MPc催化性能的影响.发现反应遵循配位-链锁反应机理.反应速度对异丙苯为1.5级,对催化剂为0.5级.反应活化能分别为53.1kJ/mol.(CoPe)和43.9 kJ/mol.(FePc).在所选择的反应条件下,异丙苯转化率较低(小于35%),生成过氧化氢异丙苯选择性约为100%.加入第五配体可使诱导期消失.电子光谱和反应动力学结果同时表明,反应是由O_2的配位活化引发的,ESR结果证明酞菁环的电子可和金属离子进行交换. 相似文献
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为了确定双核金属酞菁化合物对亚硫酰氯还原反应是否具有比单核金属酞菁更强的电催化性能, 通过循环伏安测试方法, 用酞菁钴和酞菁铁作为对比, 研究了双核钴锰酞菁在1.5 mol·L-1 LiAlCl4/SOCl2电解液中的电催化行为, 并计算出动力学参数, 由此来评估具有平面结构的双核金属酞菁化合物对亚硫酰氯还原的催化活性的影响. 通过比较循环伏安曲线发现, 与单核酞菁钴(II)和酞菁铁(II)相比, 双核钴锰酞菁对SOCl2还原反应具有更好的催化活性, 能提高SOCl2还原反应的交换速率常数和SOCl2在玻碳电极上的扩散系数, 从而提高SOCl2还原电位和电流.通过ER14250型实体电池10 mA放电性能测试验证表明, 与单核酞菁钴和酞菁铁催化剂的电池相比, 双核钴锰酞菁在低温(-30 ℃)下可提高放电中点电压0.3 V, 在常温(25 ℃)下可以提高放电容量约100 mAh, 催化效果比单核酞菁钴和酞菁铁显著. 相似文献
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Journal of Solid State Electrochemistry - Electrochemical noise measurements were carried out on commercially available Li/SOCl2 and Li/MnO2 primary batteries during relaxation following removal of... 相似文献
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Hiroyuki Ohtani Takayoshi Kobayashi Takashi Tanno † Akira Yamada Dieter Wöhrle † Takeshi Ohno 《Photochemistry and photobiology》1986,44(2):125-129
Abstract— Metallophthalocyanines (MPc) and tetrasubstituted magnesium phthalocyanines (MgPcR4 ) were investigated as sensitizers for the photoreduction of methylviologen (MV2+ ) under visible light(420–800 nm) irradiation using disodium ethylenediaminetetraacetic acid (Na2 EDTA) as an electron donor in dimethyl formamide (DMF)-water mixture. Magnesium phthalocyanine and aluminium phthalocyanine were found to be the most efficient sensitizers among nine MPc's examined (M = 2Li, 2Na, Mg, Ca, Al(Cl), Fe, Ni, Co, and Zn). The following sequence of the efficiency among MgPc and MgPcR4 's was obtained. 相似文献
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Graphene wrapped phthalocyanine: Enhanced oxidative desulfurization for dibenzothiophene in fuel 下载免费PDF全文
Graphene wrapped metal phthalocyanine (MPc/RGO, M = Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+) composites are synthesized by a facile ‘in situ hydrothermal’ method, using graphene oxide, M (CH3COO)2 and phthalic anhydride as the precursors. A biomimetic catalytic system of MPc/RGO and molecular O2 have high activity for ultra‐deep removal of dibenzothiophene (DBT) in model oil containing n‐octane. Compared with pure graphene oxide and MPc, MPc/RGO composites displayed highly enhanced catalytic activity for the oxidation of dibenzothiophene in n‐octane. The conversion ratio of DBT was up to 97.51% after 180 min treatment at 60 °C and atmospheric pressure. The photostability of RGO/MPc composites photocatalystic degradation of dibenzothiophene was investigated. Mechanistic studies revealed that the RGO/MPc ? O2 · species were the main active intermediate via the π‐π stacking interaction of MPc and RGO. The RGO wrapped phthalocyanine materials offer great potential as active photocatalysts for degradation of thiophene derivatives in fuel. 相似文献
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We systematically investigated the weak epitaxy growth (WEG) behavior of a series of planar phthalocyanine compounds (MPc), i.e., metal-free phthalocyanine (H2Pc), nickel phthalocyanine (NiPc), copper phthalocyanine (CuPc), zinc phthalocyanine (ZnPc), iron phthalocyanine (FePc), cobalt phthalocyanine (CoPc), grown on a p-sexiphenyl ( p-6P) monolayer film by selected area electron diffraction (SAED) and atomic force microscopy (AFM). Two types of epitaxial relations, named as incommensurate epitaxy and commensurate epitaxy, were identified between phthalocyanine compounds and the substrate of the p-6P film. The tiny variation of the lattice constant of phthalocyanine compounds can result in different crystal orientations. The change rule of incommensurate and commensurate epitaxy was extracted. The tendency of commensurate epitaxy becomes weaker as the lattice constant b increases, while it gets stronger as the substrate temperature is elevated. Large size and continuous H2Pc films can be obtained by controlling the growth conditions. The WEG method is generally applicable in the whole family of planar phthalocyanine compounds and may be used to fabricate other high-quality organic films. 相似文献
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以四氨基铜(锌)酞菁为四胺单体, 与4,4'-二苯醚二胺(4,4'-ODA)和二苯醚四酸酐(ODPA)进行共聚, 合成了聚(金属酞菁)酰亚胺. 由于金属酞菁的引入, 聚(铜酞菁)酰亚胺和聚(锌酞菁)酰亚胺的介电常数均高于传统聚酰亚胺(PI). 以聚(铜酞菁)酰亚胺为基体, 采用溶液共混的方法, 制备了一系列碳纳米管/聚(铜酞菁)酰亚胺复合材料, 碳纳米管较为均匀地分散在聚合物基体中. 复合材料具有良好的介电性能, 掺杂碳纳米管质量分数为20%的复合材料的介电常数达到200, 介电损耗为2.25. 相似文献
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Tomachinskaya L. A. Kolotilova Yu. Yu. Chernii V. Ya. Volkov S. V. 《Theoretical and Experimental Chemistry》2003,39(2):104-108
We have used cyclic voltammetry to study the electrochemical properties of novel bis(-diketonate)phthalocyanine complexes of Zr(IV) and Hf(IV) in dichloromethane. We found three waves for the studied complexes that can be attributed to one-electron processes MPc(L)0/1–
2, MPc(L)1+/0
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2. We have shown that the electrochemical behavior of the complexes depends on the nature of the substituents in axial ligands and does not depend on the nature of the metals. We have analyzed the stability of the one-electron oxidation products of the complexes relative to disproportionation. 相似文献
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Phthalocyanines with four biphenyl-malonic ester groups on the periphery were synthesized by cyclotetramerization of 4-(1,1-dicarbethoxy-2-(4-biphenyl)-ethyl)-phthalonitrile. The new compounds were characterized by elemental analyses, FT-IR, 1H NMR, 13C NMR, UV–Vis, and MASS spectral data. Electrochemical behaviors of novel Co(II), Cu(II), and Pd(II) phthalocyanines were investigated by cyclic voltammetry, potential differential pulse voltammetry, and applied potential chronocoulometry techniques. While Cu(II) and Pd(II) phthalocyanines give up to four common phthalocyanine ring reductions, Co(II) phthalocyanine gave two ligand-centered and two metal-centered redox processes. HOMO–LUMO gap of the complexes are comparable with the reported MPc papers. 相似文献