摘要
采用电化学合成前驱体直接水解法制备纳米TiO2膜修饰电极,通过循环伏安法研究了纳米TiO2膜电极的电化学行为,并使用纳米TiO2膜电极作为阴极在三室离子膜电解槽中电解还原顺丁烯二酸(cis-butenedioic acid)合成丁二酸(butanedioic acid),探索了影响电合成丁二酸电流效率的主要因素.结果表明,纳米TiO2膜电极具有异相电催化行为,纳米膜中的TiⅣ/TiⅢ氧化还原电对作为媒质间接电还原顺丁烯二酸为丁二酸,电合成丁二酸的一次结晶产品纯度高、电解副反应少、收率和电流效率高,控制阴极电位-0.6 V(vs.SCE),电流密度6 A/dm2,电解液为1.0 mol/L顺丁烯二酸+1.0 mol/L硫酸溶液,电流效率达到88%以上.
Nanocrystalline TiO2 film electrodes （Ti/nano-TiO2） was prepared directly using electrochemical synthesis precursor Ti（OEt）4 by the sol-gel method. Redox behaviors and electrocatalytic activities of the Ti/nano-TiO2 electrode were investigated by cyclic voltammetry （CV）, and cis-butenedioic acid was electroreduced to butanedioic acid in the ternary-room-ion.film electrolytic cell with Ti/nano-TiO2 film cathode. The main factors of affecting the current efficiency in electrosynthesis of butanedioic acid were studied. The results indicated that the Ti/nano-TiO2 film electrode have the heterogeneous electrocatalytic activities and the indirect electroreduction of cis-butenedioic acid to butanedioic acid by Ti^Ⅳ/Ti^Ⅲ redox system as mediator on the nanocrystalline TiO2 film surface. This process hasmany advantages： fewer side- reaction, higher purity of ence crystallized products, higher current efficiency and electrolysis yield, free from pollution etc. The current efficiency is over 88% in 1.0 mol/L cis- butenedioic acid ＋ 1 mol/L H2SO4 solution by electrolysis at -0.6 V （ vs . SCE）and 6 A/dm^2.
出处
《安徽师范大学学报（自然科学版）》
CAS
2005年第3期298-302,共5页
Journal of Anhui Normal University(Natural Science)
基金
国家自然科学基金项目(20476001)
安徽省自然科学基金项目(00045317)
关键词
丁二酸
纳米TiO2膜阴极
电合成
电催化
顺丁烯二酸
butanedioic acid
nanocrystalline TiO2 film electrode
electrosynthesis
electrocatalysis
cis-butenedioic acid
