以氧化铟锡(indium tin oxide,ITO)为代表的透明导电氧化物(transparent conducting oxide,TCO)在当前光电器件中的重要性日益增长.通过在TCO中引入金属网格构成复合电极,可以在保持良好透明性的前提下有效提升电学性能,同时降低对铟的...以氧化铟锡(indium tin oxide,ITO)为代表的透明导电氧化物(transparent conducting oxide,TCO)在当前光电器件中的重要性日益增长.通过在TCO中引入金属网格构成复合电极,可以在保持良好透明性的前提下有效提升电学性能,同时降低对铟的需求量,并为可穿戴设备所需的柔性电极提供可能方案.对此类电极的电学性能分析,如复合电极方阻随金属网格结构参数的变化,可为电极设计与制备提供基本的出发点,但相关理论尚十分缺乏.本文针对典型的方孔方格型金属网格-TCO复合电极,分别展开基于瑞利模型和基于有限元仿真的电学性能分析.结果表明,孔型近似导致的金属通道显著畸变是复合电极的电学计算中瑞利模型在中高开口率下失效的主要原因.据此,我们采用格型修正,通过提升瑞利模型中的原胞外边界对称性来改善金属通道的畸变.与电极仿真的对比表明,修正后瑞利模型的适用范围明显扩大,其结果可与实验数据很好地拟合,为此类复合透明电极的电学数据分析与结构设计提供了简洁高效的理论工具.展开更多
采用包覆的方法制备出MO/C型复合电极材料,通过X射线衍射(XRD)对复合材料的结构组成进行表征分析,另外通过循环伏安法、计时电位法和交流阻抗技术对复合电极材料在6 M KOH溶液中的电化学电容性能进行考查。结果表明:包覆了过渡金属锰氧...采用包覆的方法制备出MO/C型复合电极材料,通过X射线衍射(XRD)对复合材料的结构组成进行表征分析,另外通过循环伏安法、计时电位法和交流阻抗技术对复合电极材料在6 M KOH溶液中的电化学电容性能进行考查。结果表明:包覆了过渡金属锰氧化物的复合电极材料在0.5 A/g的电流密度下比电容最高可达218.3 F/g。此外,MO/C型复合电极材料表现出较好的功率性能,当电流密度增加到5 A/g,其比电容值达到168.0 F/g,其电容保持率为77.0%,表明这是一种很有前景的电极材料。展开更多
本课题制备了一种F掺杂铜氧化物负载活性炭新型复合催化剂,并以此构建三维电极电Fenton体系。为探究此三维电极电Fenton体系对邻硝基苯酚(2-NP)降解的最佳条件,本实验对比了活性炭(GAC)、F掺杂铜氧化物负载活性炭复合催化剂(F/CuOx-GAC...本课题制备了一种F掺杂铜氧化物负载活性炭新型复合催化剂,并以此构建三维电极电Fenton体系。为探究此三维电极电Fenton体系对邻硝基苯酚(2-NP)降解的最佳条件,本实验对比了活性炭(GAC)、F掺杂铜氧化物负载活性炭复合催化剂(F/CuOx-GAC)、未掺杂F的铜氧化物负载活性炭复合催化剂(CuOx-GAC)对2-NP降解情况。并以降解效果最优的催化剂为基础,分别对反应时间、pH值、极板间距、电流密度、电极投加量、电解质浓度、曝气速率这些因素进行了单因素实验。结果表明,最佳实验条件为2 g催化剂、pH = 4、电极间距为3 cm、电流密度为20 mA/cm2、电解质浓度为30 mM、曝气速率为1.25 L/min,在该条件下反应3 h后体系2-NP去除率为98.12%。其中,在一定范围内电流密度与2-NP的去除率成正比,催化剂的量、电极间距在合适时,电流效率和传质效能达到平衡最高点。此外,还通过不同体系对比、催化剂表征、自由基猝灭,初步探明了所构建的三维电极电Fenton体系对2-NP的降解机制,并进一步验证其高效性。In this paper, a novel composite catalyst of F-doped copper oxide supported activated carbon was prepared, and a three-dimensional electrode electro-Fenton system was constructed. In order to explore the optimal conditions for the degradation of o-nitrophenol (2-NP) by this three dimensional electrode electro-Fenton system, this experiment compared the degradation of 2-NP by activated carbon (GAC), F-doped copper oxide supported activated carbon composite catalyst (F/CuOx-GAC), and undoped copper oxide supported activated carbon composite catalyst (CuOx-GAC). Based on the catalyst with the best degradation effect, the single-factor experiments were carried out on the factors of reaction time, pH value, plate spacing, current density, electrode dosage, electrolyte concentration, and aeration rate. The results showed that the optimal experimental conditions were 2 g catalyst, pH = 4, electrode spacing of 3 cm, current density of 20 mA/cm2, electrolyte concentration of 30 mM, and aeration rate of 1.25 L/min. Under these conditions, the removal rate of 2-NP in the system was 98.12% after 3 h of reaction. In a certain range, the current density is proportional to the removal rate of 2-NP, and the current efficiency and mass transfer efficiency reach the highest point of balance when the amount of catalyst and electrode spacing are appropriate. In addition, through the comparison of different systems, catalyst characterization, and radical quenching, the degradation mechanism of 2-NP by the constructed three-dimensional electrode electro-Fenton system was preliminarily proved, and its efficiency was further verified.展开更多
文摘以氧化铟锡(indium tin oxide,ITO)为代表的透明导电氧化物(transparent conducting oxide,TCO)在当前光电器件中的重要性日益增长.通过在TCO中引入金属网格构成复合电极,可以在保持良好透明性的前提下有效提升电学性能,同时降低对铟的需求量,并为可穿戴设备所需的柔性电极提供可能方案.对此类电极的电学性能分析,如复合电极方阻随金属网格结构参数的变化,可为电极设计与制备提供基本的出发点,但相关理论尚十分缺乏.本文针对典型的方孔方格型金属网格-TCO复合电极,分别展开基于瑞利模型和基于有限元仿真的电学性能分析.结果表明,孔型近似导致的金属通道显著畸变是复合电极的电学计算中瑞利模型在中高开口率下失效的主要原因.据此,我们采用格型修正,通过提升瑞利模型中的原胞外边界对称性来改善金属通道的畸变.与电极仿真的对比表明,修正后瑞利模型的适用范围明显扩大,其结果可与实验数据很好地拟合,为此类复合透明电极的电学数据分析与结构设计提供了简洁高效的理论工具.
文摘本课题制备了一种F掺杂铜氧化物负载活性炭新型复合催化剂,并以此构建三维电极电Fenton体系。为探究此三维电极电Fenton体系对邻硝基苯酚(2-NP)降解的最佳条件,本实验对比了活性炭(GAC)、F掺杂铜氧化物负载活性炭复合催化剂(F/CuOx-GAC)、未掺杂F的铜氧化物负载活性炭复合催化剂(CuOx-GAC)对2-NP降解情况。并以降解效果最优的催化剂为基础,分别对反应时间、pH值、极板间距、电流密度、电极投加量、电解质浓度、曝气速率这些因素进行了单因素实验。结果表明,最佳实验条件为2 g催化剂、pH = 4、电极间距为3 cm、电流密度为20 mA/cm2、电解质浓度为30 mM、曝气速率为1.25 L/min,在该条件下反应3 h后体系2-NP去除率为98.12%。其中,在一定范围内电流密度与2-NP的去除率成正比,催化剂的量、电极间距在合适时,电流效率和传质效能达到平衡最高点。此外,还通过不同体系对比、催化剂表征、自由基猝灭,初步探明了所构建的三维电极电Fenton体系对2-NP的降解机制,并进一步验证其高效性。In this paper, a novel composite catalyst of F-doped copper oxide supported activated carbon was prepared, and a three-dimensional electrode electro-Fenton system was constructed. In order to explore the optimal conditions for the degradation of o-nitrophenol (2-NP) by this three dimensional electrode electro-Fenton system, this experiment compared the degradation of 2-NP by activated carbon (GAC), F-doped copper oxide supported activated carbon composite catalyst (F/CuOx-GAC), and undoped copper oxide supported activated carbon composite catalyst (CuOx-GAC). Based on the catalyst with the best degradation effect, the single-factor experiments were carried out on the factors of reaction time, pH value, plate spacing, current density, electrode dosage, electrolyte concentration, and aeration rate. The results showed that the optimal experimental conditions were 2 g catalyst, pH = 4, electrode spacing of 3 cm, current density of 20 mA/cm2, electrolyte concentration of 30 mM, and aeration rate of 1.25 L/min. Under these conditions, the removal rate of 2-NP in the system was 98.12% after 3 h of reaction. In a certain range, the current density is proportional to the removal rate of 2-NP, and the current efficiency and mass transfer efficiency reach the highest point of balance when the amount of catalyst and electrode spacing are appropriate. In addition, through the comparison of different systems, catalyst characterization, and radical quenching, the degradation mechanism of 2-NP by the constructed three-dimensional electrode electro-Fenton system was preliminarily proved, and its efficiency was further verified.
