摘要
通过在乙醇中电化学溶解Ti金属阳极合成前驱体Ti(OEt)4和溶胶-凝胶法在Ti表面修饰一层纳米TiO2-碳纳米管(nanoTiO2-CNT)复合膜,采用循环伏安和电解合成法研究了nanoTiO2-CNT复合膜电极在N,N-二甲基甲酰胺(DMF)中的氧化还原行为以及对糠醛(furfural)还原的电催化活性.结果发现,nanoTiO2-CNT电极在阴极扫描时有两对氧化还原峰,可逆半波电位E1r/2分别为-1.27V和-2.44V(vsSCE,扫描速度100mV·s-1),分别对应于TiO2/Ti2O3氧化还原电对的可逆电极过程和TiO2/Ti(OH)3电对的准可逆电极过程;在DMF电解液中nanoTiO2-CNT复合膜中的Ti(IV)/Ti(III)氧化还原电对作为媒质间接电还原糠醛为糠醇,反应机理为电化学偶联随后化学催化反应(EC′)机理.
The precursor Ti（OEt）4 was prepared by anodic dissolution of metallic titanium in absolute ethanol and directly hydrolyzed to prepare nanocrystalline TiO2-carbon nanotube（nanoTiO2-CNT） complex film by a sol-gel process. Redox behavior and electrocatalytic activities of the nanoTiO2-CNT complex film electrode were investigated by cyclic voltammetry（CV） and bulk electrolysis in DMF solution. It was found that there were two pairs of well-defined redox peaks for nanoTiO2-CNT complex film electrode with E1/2^r of -1.27 V and -2.44 V（vs SCE） at 100 mV·s^-1 in correspondence with TiO2/Ti2O3 reversible and TiO2/Ti（OH）3 quasi-reversible electrode process, and the heterogeneous electrocatalytic reduction activities of TiO2/Ti（OH）3 redox system for furfural; The indirect electroreduction of furfural to furfural alcohol by Ti（Ⅳ）/Ti（Ⅲ） redox system on nanoTiO2-CNT complex film surface in DMF. The electrode reaction mechanism is the called catalytic （EC＇） mechanism.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2006年第3期373-377,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(20476001)
安徽省自然科学基金(00045317)资助项目
关键词
糠醛
电催化还原
糠醇
纳米TIO2
碳纳米管
复合膜电极
Furfural, Electrocatalytic reduction, Furfural alcohol, Nanocrystalline TiO2, Carbon nanotube,Complex film electrode
