NanoTiO2-CNT复合膜电极在DMF溶液中对糠醛的异相电催化还原

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TiO(下标 2-)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E(上标 r 下标 1/2)分别为－1.27V和－2.44V（υs SCE，扫描速度l00mV•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 E(superscript r subscript 1/2) of -1.27 V and -2.44 V(υs SCE) at 100 mV s^(-1) in correspondence with TiO2/Ti2O 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.
 
關鍵詞 alcohol,Nanocrystalline TiO2,Carbon nanotube,Complex film electrode
CEPS分類 學科別>自然科學>物理
學科別>自然科學>化學
系統識別號 275619
篇　名 並列篇名 Heterogeneous Electrocatalytic Reduction of Furfural on Nanocrystalline TiO2-CNT Complex Film Electrode in DMF Solution
作　者 褚道葆(Dao-Bao Chu);张莉艳(Li-Yan Zhang);张金花(Jin-Hua Zhang);张秀梅(Xiu-Mei Zhang);尹晓娟(Xiao-Juan Yin)
刊　名 物理化學學報

頁次 373-377
資料語文 中文