有机体系中纳米TiO_2/ZrO_2修饰电极的制备及电催化活性

Electro-catalytic Activity and Preparation of Nano-crystalline ZrO_2 / TiO_2 Modified Electrode in Organic System

电催化技术以其可控制性强、反应条件温和、设备占地面积小、可以与其它方法相结合等诸多优点而日益引起人们的广泛关注。纳米TiO2膜电极具有独特的光电性质和电化学性质,且纳米TiO2膜在酸碱中的稳定性好。ZrO2是一种多功能材料,特别是在催化领域中表现出独特的催化活性和选择性,

The complexes Ti（OCH2CH2O）2 and Zr（OCH2CH2O）2 were dire dissolution in 50 mL flask. The nano-ZrOJTiO2 powders were prepared by ctly synthesized by using HOCH2CH2OH a direct sol-gel synthesis using the above solution and followed by drying at 400 ℃ for 2 h. The complexes were characterized by FTIR and ^1H NMR. XRD and TEM were used to investigate the structure of nano-ZrO2/TiO2. The results show that the complexes containing ^-OCH2CH2O^- group could prevent the precursor from agglomeration and sintering during the hydrolysis and calcination process. The ZrO2/TiO2 powders of 20-35 nm was thus obtained in a high purity. The highly active nano- ZrO2/TiO2 modified electrode was prepared by using daubing and calcination. The electro-catalytic activities of this electrode in （COOH）2 were investigated. The discharge current of nano-ZrO2/TiO2 electrode increased obviously. In preparative electrolysis under optimal conditions, the average yield and current efficiency for HOOC-CHO were 84.7% and 91.6 %, respectively.