物理化学学报 >> 2006, Vol. 22 >> Issue (10): 1238-1242.doi: 10.3866/PKU.WHXB20061013

研究论文 上一篇    下一篇

乙醇在Pt/nanoTiO2-CNT复合催化剂上的电催化氧化

褚道葆;尹晓娟;冯德香;林华水;田昭武   

  1. 安徽师范大学化学与材料科学学院, 安徽省功能性分子固体重点实验室, 安徽 芜湖 241000; 厦门大学化学系, 固体表面物理化学国家重点实验室, 福建 厦门 361005
  • 收稿日期:2006-02-20 修回日期:2006-03-29 发布日期:2006-10-11
  • 通讯作者: 褚道葆 E-mail:dbchu@sina.com

Electrocatalytic Oxidation of Ethanol on Pt/nanoTiO2-CNT Complex Catalysts

CHU Dao-Bao;YIN Xiao-Juan;FENG De-Xiang;LIN Hua-Shui;TIAN Zhao-Wu   

  1. Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, P. R. China; Department of Chemistry, State Key Laboratory for Physical Chemistry of the Solid Surface, Xiamen University, Xiamen 361005, P. R. China
  • Received:2006-02-20 Revised:2006-03-29 Published:2006-10-11
  • Contact: CHU Dao-Bao E-mail:dbchu@sina.com

摘要: 通过前驱体Ti(OEt)4直接水解和电化学扫描电沉积法制备在Ti基体上的纳米TiO2-碳纳米管复合膜载Pt(Pt/nanoTiO2-CNT)复合催化剂. 透射电镜 (TEM) 和X射线衍射 (XRD) 结果表明, 锐钛矿型纳米TiO2粒子和Pt纳米粒子(粒径均为5~10 nm)均匀地分散在碳纳米管表面. 通过循环伏安和计时电流法研究表明, Pt/nanoTiO2-CNT 复合催化剂(Pt载量为0.32 mg•cm−2) 具有高达51.8 m2•g−1的电化学活性比表面积, 常温常压下对乙醇的电化学氧化具有高催化活性和稳定性, 乙醇氧化峰电位分别为0.59、0.96和0.24 V, 氧化峰电流密度分别达到−115、−113和−75 mA•cm−2. 复合催化剂对乙醇电氧化的高催化活性可归因于nanoTiO2、CNT和Pt纳米粒子的协同催化作用.

关键词: 乙醇电氧化, 直接乙醇燃料电池, 阳极催化剂, 纳米TiO2, 碳纳米管, 铂纳米粒子

Abstract: Pt/nanoTiO2-CNT complex catalysts were prepared by direct hydrolysis of Ti(OEt)4 and electrochemical scan electrodepositing method. The results of XRD and SEM showed that the nanoTiO2 (anatase) and Pt nanoparticles (size about 5~10 nm) were dispersed uniformly on CNT film surface. The electrocatalytic activity of Pt/nanoTiO2-CNT electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that Pt/nanoTiO2-CNT electrode (Pt loading was 0.32 mg•cm−2) exhibited high electrochemical activity surface area (51.8 m2•g−1) and very high electrocatalytic activity and stability for the electro-oxidation of ethanol at room temperature in atmosphere pressure. The oxidation peak potentials of ethanol were 0.59, 0.96, and 0.24 V, and the corresponding oxidation peak current sdensities were −115, −113, and −75 mA•cm−2. The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect among nanocomposite.

Key words: Electro-oxidation of ethanol, Direct ethanol fuel cell, Anode catalyst, Nanocrystalline TiO2, Carbon nanometer tubes, Pt nanoparticle