Composite Electrodeposited PbO_2/Co_3O_4 on a Ti Substrate as Positive Electrode Materials for a Hybrid Supercapacitor

PbO_2/Co_3O_4 composites were prepared on a Ti substrate by means of a composite electrodeposition method in Pb~(2+) plating solution containing dissolved nano-Co_3O_4 particles. X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectrometry(EDS) and transmission electron microscopy(TEM) were used to characterize the chemical composition and morphology of the PbO_2/Co_3O_4 composites. The electrochemical and capacitance performance of the composites were investigated by cyclic voltammetry(CV), charge-discharge tests and electrochemical impedance(EIS). The results indicate that the composites comprise rutile phase Co_3O_4 and β-PbO_2. In addition, the surface of the composite electrode is rough and porous. The PbO_2/Co_3O_4 composites exhibit a high specific capacitance up to 215 F/g, which is ten times higher than that of the pure-PbO_2 and two times higher than that of the pure-Co_3O_4 in 1 mol/L NaOH electrolytes.     

Synthesis,Fluorescence and Dielectric Properties of Two Novel Compounds Based on Triethylenediamine Derivatives

Two compounds C_8H_(18)N_2Br_3Mn_(0.5)(1) and C_(12)H_(26)N_2Cl_4Mn(2) based on triethylenediamine derivatives were synthesized by solution method and were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray structure analysis, fluorescence test, circular dichroism(CD) analysis and dielectric measurement, respectively. According to single-crystal X-ray determination, compound 1 crystallizes in the cubic system, space group Pa3 with a = b = c = 13.7246(5) ?, Z = 24, V = 2585.2(3) ?~3; and compound 2 crystallizes in the orthorhombic system, space group P212121 with a = 7.9716(13), b = 15.309(3), c = 15.804(3) ?, Z = 4 and V = 1928.7(6) ?3. Fluorescent analysis of compound 1 showed an intense emission band at 670 nm when the exciting radiation was set at 378 nm and fluorescent analysis of compound 2 showed an intense emission band at 515 nm when the exciting radiation was set at 363 nm. Dielectric constants of compounds 1 and 2 were measured at different frequencies with temperature variation.     

基于轴手性配体的两个镧系金属配合物的合成、表征及其荧光性质

通过水热法,合成了2个基于轴手性配体2,2''-dinitro-4,4''-biphenyldicarboxylic acid（H₂nbpdc）的配位聚合物[La（nbpdc）（phen）（FA）]_n（1）,[Eu（nbpdc）（phen）（FA）]_n（2）（phen=菲咯啉,FA=甲酸根）,并且对2个化合物进行了红外、单晶X射线衍射、热重、荧光、CD谱及介电性质的研究。晶体结构测试表明,2个化合物结晶在正交晶系P2₁2₁2₁手性空间群,且具有相同的三维拓扑结构。荧光性质测定表明化合物1和2分别在606和615.5 nm处有强的发射光谱。与此同时,固体CD谱测试进一步证实2个化合物具有手性。     

基于轴手性配体的两个镧系金属配合物的合成、表征及其荧光性质

通过水热法，合成了2个基于轴手性配体2，2''-dinitro-4，4''-biphenyldicarboxylic acid（H₂nbpdc）的配位聚合物[La（nbpdc）（phen）（FA）]_n（1），[Eu（nbpdc）（phen）（FA）]_n（2）（phen=菲咯啉，FA=甲酸根），并且对2个化合物进行了红外、单晶X射线衍射、热重、荧光、CD谱及介电性质的研究。晶体结构测试表明，2个化合物结晶在正交晶系P2₁2₁2₁手性空间群，且具有相同的三维拓扑结构。荧光性质测定表明化合物1和2分别在606和 615.5 nm处有强的发射光谱。与此同时，固体CD谱测试进一步证实2个化合物具有手性。     

Synthesis,Structure and Dielectric Properties of a Novel 1D Chain Bismuth(Ⅲ) Complex[(C_6H_6NO_2)_2·(BiCl_5)·2H_2O]_n

Under hydrothermal conditions,isonicotinic acid reacted with BiCl 3 to give 1D zigzag chain complex [(C 6 H 6 NO 2) 2 ·(BiCl 5)·2H 2 O] n (1).Single-crystal X-ray determination shows that compound 1 crystal-lizes in the monoclinic system,space group C2/c with a=13.115(3),b=19.957(4),c=7.9374(16),β=97.45(3)°,Z=4,V=2060.0(8) 3,C 12 H 16 BiCl 5 N 2 O 6,D c=2.162 g/cm 3,M r=670.50,λ(MoKa)=0.71073,μ=9.237 mm-1,F(000)=1272,R=0.0208 and wR=0.0503.Dielectric constant of compound 1 was measured at different conditions.Measurements on the dielectric properties of 1 showed that the 1D chain coordination polymer exhibited a dipolar chain relaxation process and a relatively high dielectric constant.     

钛基PbO2+nano-WO3电极材料的复合共沉积及析氧活性

利用复合共沉积法,在涂有中间层SnO2-Sb2O5的Ti基体上制备了PbO2+nano-WO3复合电极材料.采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和双电层电容法等对复合电极表面的组成、结构、形貌及有效电化学面积进行测试.结果表明,随着纳米WO3掺杂量逐渐增大,复合电极的表面粗糙度和孔隙率逐渐变大,电化学有效面积也随之增大;利用线性扫描及Tafel曲线等电化学测试方法研究了nano-WO3的掺杂对复合电极析氧活性的影响,结果表明,掺杂nano-WO3的复合电极较纯PbO2电极的析氧活性大幅提高,其起始析氧电位发生负移,析氧过电位下降,最大可降低近300 m V.