载铂二氧化钛纳米管电极的制备及电催化性能

TiO2-NTs/Pt Electrodes Prepared by Hydrothermal Method andElectrocatalytic Performance

摘要:

用水热法在二氧化钛纳米管上负载纳米铂微粒，制备出大比表面积、高表面原子数的载铂二氧化钛纳米管电极。 SEM和XRD分析证明纳米管上已负载20~30 nm的铂微粒。循环伏安测试结果表明：不含染料的体系中，载铂二氧化钛纳米管电极在0.13 V处的氧化峰电流密度为Pt片电极的10倍；含染料的体系中，载铂二氧化钛纳米管电极上对酸性大红GR的氧化峰电流密度达到Pt片电极上的4.2倍。对酸性大红GR的降解实验表明，载铂二氧化钛纳米管电极催化活性高、降解快速高效

Abstract:

Highly ordered TiO2 nanotubes (TiO2-NTs) were grown from Ti substrate. More load sites for specified metal were provided by this nanotube structure. TiO2-NTs/Pt electrodes for electrocatalytic oxidation were prepared through hydrothermal reaction between TiO2 nanotubes and H2PtCl6·6H2O. Characterization of the electrodes by scanning electron microscope (SEM) and X-ray diffraction (XRD) illustrates that Pt nanoparticles with an average size of 20-30 nm are dispersed on the surface or in the pore of TiO2 nanotube. The results of cyclic voltammetry (CV) show that in the system without dyes the current density at the oxidation peak of 0.13 V of TiO2-NTs/Pt electrodes is 9 times greater than that of Pt bulk electrode; while in the system with dyes, the oxidation peak current density of the TiO2-NTs/Pt electrodes to acid scarlet GR is 4.2 times that of Pt bulk electrodes. The results of degradation to acid scarlet GR show that TiO2-NTs/Pt electrodes possess high catalytic activity and high-efficiency degradation ability