Pd/TiO2/C复合催化剂的制备及其在碱性溶液中对乙醇氧化的电催化性能 |
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引用本文: | 李巧霞,杨意超,刘明爽,毛宏敏,徐群杰.Pd/TiO2/C复合催化剂的制备及其在碱性溶液中对乙醇氧化的电催化性能[J].电化学,2014,20(1):85. |
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作者姓名: | 李巧霞 杨意超 刘明爽 毛宏敏 徐群杰 |
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作者单位: | 上海电力学院上海高校电力腐蚀控制与应用电化学重点实验室,上海 200090 |
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基金项目: | 国家自然科学基金项目(No.21103107);上海市科委能力建设项目(No.10160502300)资助 |
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摘 要: | 钛酸四丁酯前驱体水热合成制备纳米TiO2颗粒,在TiO2和Vulcan XC-72活性炭复合载体上液相还原负载Pd纳米颗粒,制得Pd/TiO2/C复合催化剂. 通过透射电镜(TEM)和X射线衍射(XRD)测试表明其具有面心立方结构,Pd金属粒子(粒径约3 ~ 4 nm)均匀分散在锐钛矿型的纳米TiO2和活性炭的复合载体上. 循环伏安和计时电流曲线测试表明,与相同Pd载量的Pd/C相比,20% Pd载量的Pd/TiO2/C颗粒在常温常压下对乙醇的电催化氧化有很高活性和稳定性. 这主要归功于纳米TiO2改变了Pd表面的电子特性,且增大了其比表面积.
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关 键 词: | 燃料电池 Pd/TiO2/C 乙醇氧化 碱性溶液 |
收稿时间: | 2012-09-29 |
Preparation of Pd/TiO2/C Catalyst and Its Electrocatalytic Performance in Basic Solution for Ethanol Oxidation |
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Abstract: | Nanoparticles TiO2 were prepared by hydrothermal method using precursor tetrabutyl titanate. The Pd/TiO2/C catalyst was synthesized by liquid phase reducing method supported on nano TiO2 and Vulcan carbon XC-72. The Pd/TiO2/C catalyst was characterized by XRD, TEM, cyclic voltammetry, and chronopotentiometry. XRD confirmed the face-centered cubic structure of Pd particles, and TEM indicated that Pd particles (size 3 ~ 4 nm) dispersed uniformly on TiO2 and carbon XC-72. The results from cyclic voltammogram and chronopotentiogram showed the higher ethanol oxidation activity and stability of Pd/TiO2/C catalyst (20% Pd) as compared with those of Pd/C catalyst at ambient temperature and pressure in alkaline media. The improved properties in Pd/TiO2/C catalyst (20% Pd) might mainly due to the presence of TiO2 nanoparticles which changed the electron properties on Pd surface and increased the electrochemical surface area. |
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Keywords: | fuel cell Pd/TiO2/C ethanol oxidation basic solution |
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