In this paper, highly ordered anodic aluminum oxide (AAO) template with hexagonal close-packed arrays was successfully fabricated through a two-step anodization process. Ag nanowire arrays with high aspect ratio were ...In this paper, highly ordered anodic aluminum oxide (AAO) template with hexagonal close-packed arrays was successfully fabricated through a two-step anodization process. Ag nanowire arrays with high aspect ratio were prepared using cyclic voltammetry within the confined nanochannels of AAO template. In addition, standing Ag nanowire arrays free-support of templates were also fabricated successfully by cyclic voltammetry method. The micrographs and crystal structures of Ag nanowires were studied by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). FESEM observation showed that the Ag nanowire arrays with high aspect ratio lie orderly on the surface of the substrate. The diameter of the Ag nanowire is about 60 nm and the length up to 30 靘 or more. While the controlled nanowire arrays exhibit highly ordered structure in large area and the standing Ag nanowire in the array has the length of 1 靘 and good orientation. XRD results illustrated that the Ag nanowires in the arrays deposited by cyclic voltammetry method have a face centered cubic structure and are preferentially oriented in the (220) direction.展开更多
The electrochemical behavior of Mn (Ⅲ)/Mn(Ⅱ)ion-pair on platinum electrode in acid media were studied by cyclic voltammetry.It was demonstrated that the redox process of Mn(Ⅲ)/Mn(Ⅱ) pair was a simple pseudo-revers...The electrochemical behavior of Mn (Ⅲ)/Mn(Ⅱ)ion-pair on platinum electrode in acid media were studied by cyclic voltammetry.It was demonstrated that the redox process of Mn(Ⅲ)/Mn(Ⅱ) pair was a simple pseudo-reversible one-electron reaction between Mn(Ⅲ) and Mn(Ⅱ).The electrochemical kinetics of the redox reaction on static Pt electrode was a mass transfer controlled one.The calculated diffusion coefficient of Mn(Ⅱ) was 1.48×10 -6cm 2/s.展开更多
金属制品企业生产过程产生的废水中含有金属离子和残留酸等有害物质,其处理方法有化学法、高压脉冲电解法、离子交换法和生物法等。将采用传统化学加碱(NaOH)沉淀法与采用金属离子捕捉剂除铁效果进行比较,结果表明金属离子捕捉剂较加碱...金属制品企业生产过程产生的废水中含有金属离子和残留酸等有害物质,其处理方法有化学法、高压脉冲电解法、离子交换法和生物法等。将采用传统化学加碱(NaOH)沉淀法与采用金属离子捕捉剂除铁效果进行比较,结果表明金属离子捕捉剂较加碱沉淀除铁效果好,可将废水中铁离子完全去除,但同样产生铁化合物沉淀等二次污染物。采用循环伏安法探讨含有DTCR和JH116金属离子捕捉剂的废水中铁离子的电沉积过程,并对实验结果进行讨论,当添加10 mL DTCR后,在伏安曲线上出现了一对较为明显的还原/氧化电流峰,电极表面同时迅速析出一层黑色薄膜,表明金属离子捕捉剂的添加促进了废液中铁离子的电沉积。展开更多
采用热分解法制备了不同比例钴酸镧掺杂Ti/RuO_2电极材料。通过扫描电镜(SEM)、能谱分析(EDS)、X射线粉末衍射(XRD)等分析方法表征电极涂层的物相结构与形貌特征,采用电化学测量表征电极的物理化学性能。分析表明电极涂层由不规则的颗...采用热分解法制备了不同比例钴酸镧掺杂Ti/RuO_2电极材料。通过扫描电镜(SEM)、能谱分析(EDS)、X射线粉末衍射(XRD)等分析方法表征电极涂层的物相结构与形貌特征,采用电化学测量表征电极的物理化学性能。分析表明电极涂层由不规则的颗粒组成,颗粒间有一定的孔隙,掺杂钴酸镧电极涂层含有Ti,Ru,La及Co金属元素,相结构主要为金红石相,掺杂钴酸镧电极涂层的晶粒较小,不同掺杂量对晶粒大小影响不大。电化学研究表明,电极具有典型的钌氧化物所具备的电化学性能,掺杂钴酸镧电极的电化学面积较大,电极的可逆性能得到改善。所制备的电极具有大致相同的析氧电位(1.19 V vs. SCE),随着钴酸镧掺杂量的增多,Tafel斜率依次减小,表明掺杂钴酸镧电极的活性较高,且掺杂钴酸镧后电极强化寿命得到显著提高。展开更多
文摘In this paper, highly ordered anodic aluminum oxide (AAO) template with hexagonal close-packed arrays was successfully fabricated through a two-step anodization process. Ag nanowire arrays with high aspect ratio were prepared using cyclic voltammetry within the confined nanochannels of AAO template. In addition, standing Ag nanowire arrays free-support of templates were also fabricated successfully by cyclic voltammetry method. The micrographs and crystal structures of Ag nanowires were studied by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). FESEM observation showed that the Ag nanowire arrays with high aspect ratio lie orderly on the surface of the substrate. The diameter of the Ag nanowire is about 60 nm and the length up to 30 靘 or more. While the controlled nanowire arrays exhibit highly ordered structure in large area and the standing Ag nanowire in the array has the length of 1 靘 and good orientation. XRD results illustrated that the Ag nanowires in the arrays deposited by cyclic voltammetry method have a face centered cubic structure and are preferentially oriented in the (220) direction.
文摘The electrochemical behavior of Mn (Ⅲ)/Mn(Ⅱ)ion-pair on platinum electrode in acid media were studied by cyclic voltammetry.It was demonstrated that the redox process of Mn(Ⅲ)/Mn(Ⅱ) pair was a simple pseudo-reversible one-electron reaction between Mn(Ⅲ) and Mn(Ⅱ).The electrochemical kinetics of the redox reaction on static Pt electrode was a mass transfer controlled one.The calculated diffusion coefficient of Mn(Ⅱ) was 1.48×10 -6cm 2/s.
文摘金属制品企业生产过程产生的废水中含有金属离子和残留酸等有害物质,其处理方法有化学法、高压脉冲电解法、离子交换法和生物法等。将采用传统化学加碱(NaOH)沉淀法与采用金属离子捕捉剂除铁效果进行比较,结果表明金属离子捕捉剂较加碱沉淀除铁效果好,可将废水中铁离子完全去除,但同样产生铁化合物沉淀等二次污染物。采用循环伏安法探讨含有DTCR和JH116金属离子捕捉剂的废水中铁离子的电沉积过程,并对实验结果进行讨论,当添加10 mL DTCR后,在伏安曲线上出现了一对较为明显的还原/氧化电流峰,电极表面同时迅速析出一层黑色薄膜,表明金属离子捕捉剂的添加促进了废液中铁离子的电沉积。
文摘采用热分解法制备了不同比例钴酸镧掺杂Ti/RuO_2电极材料。通过扫描电镜(SEM)、能谱分析(EDS)、X射线粉末衍射(XRD)等分析方法表征电极涂层的物相结构与形貌特征,采用电化学测量表征电极的物理化学性能。分析表明电极涂层由不规则的颗粒组成,颗粒间有一定的孔隙,掺杂钴酸镧电极涂层含有Ti,Ru,La及Co金属元素,相结构主要为金红石相,掺杂钴酸镧电极涂层的晶粒较小,不同掺杂量对晶粒大小影响不大。电化学研究表明,电极具有典型的钌氧化物所具备的电化学性能,掺杂钴酸镧电极的电化学面积较大,电极的可逆性能得到改善。所制备的电极具有大致相同的析氧电位(1.19 V vs. SCE),随着钴酸镧掺杂量的增多,Tafel斜率依次减小,表明掺杂钴酸镧电极的活性较高,且掺杂钴酸镧后电极强化寿命得到显著提高。
