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采用阳极氧化法在0.5mol·L-1硫酸+1mol·L-1马来酸的混合溶液中制得了束状TiO2薄膜.X射线衍射(XRD)分析表明样品的晶型结构主要为无定形态;所制得的样品通过原子力显微镜(AFM)观察,束状结构TiO2的宽度约2-5μm,长度超过20μm,束状结构中包含的纳米棒直径约80-150nm.将制得的束状TiO2膜电极在上述混合溶液中直接进行原位的循环伏安扫描和恒电流电解实验.研究结果表明,马来酸在该电极表面异相电催化还原生成丁二酸;在恒电流电解过程中采用电极原位活化可明显提高丁二酸的产率和电流效率,并指出改进电极的原位活化技术是未来研究工作的主要目标.
Beam-like TiO2 films were prepared by the anodic oxidation method in a mixed solution of 0.5 mol·L-1 sulfuric acid and 1 mol·L-1 maleic acid. X-ray diffraction (XRD) analysis showed that the crystalline structure of the samples was mainly amorphous ; The obtained sample was observed by atomic force microscope (AFM), the width of the beam-like structure TiO2 is about 2-5 μm, the length is over 20 μm, and the diameter of the nanorods contained in the beam-like structure is about 80-150 nm. The membrane electrode was directly in situ cyclic voltammetry and galvanostatic electrolysis experiments in the above mixed solution.The results show that maleic acid heterogeneous electrocatalytic reduction to succinic acid on the surface of the electrode; in the constant current electrolysis process The in situ activation of the electrode can obviously improve the yield and current efficiency of succinic acid. It is pointed out that the in situ activation of the improved electrode is the main target of future research work.