RuAg/TiO2-C催化剂的制备及对甲醇的电催化氧化性能

C-doped porous TiO2 supported RuAg catalyst for methanol electro-oxidation

摘要:

采用改性溶胶凝胶法和水热合成法制备了掺C多孔纳米TiO2，并以其为载体制备了一种RuAg/TiO2-C甲醇催化剂。采用X射线衍射（XRD）、透射电镜（TEM）、X射线能谱（EDS）和X射线光电子能谱（XPS）等对催化剂进行了表征，测定了其对甲醇的电催化氧化性能。实验结果表明，RuAg的负载和C的掺杂能提高TiO2对甲醇的电催化性能，RuAg/TiO2-C对甲醇电催化的循环伏安曲线中未见甲醇氧化中间产物的氧化峰，0.544 V处有一个较大的甲醇氧化峰，其峰电流密度5.8 mA/cm2，RuAg/TiO2-C比商用PtRu/C催化剂具有更高的催化活性和抗毒性，RuAg合金的负载以及RuAg合金与掺C多孔纳米TiO2载体之间较强的相互作用是其对甲醇催化性能提高的主要因素。

Abstract:

C-doped porous spherical TiO2 was prepared by modified sol-gel method and hydrothermal method. Then, it was used as support to fabricate RuAg/TiO2-C catalyst for methanol oxidation. The structural and electrochemical properties of the RuAg/TiO2-C catalyst were characterized by XRD, TEM, EDS, XPS and electrochemical analysis. The experiment results showed that the deposition of RuAg and doping of C could improve the electrocatalytic activity of the RuAg/TiO2-C catalyst for methanol oxidation. The cyclic voltammograms of the RuAg/TiO2-C catalyst showed that there was a larger methanol oxidation peak current at 0.544 V with a peak current density of 5.8 mA/cm2. No oxidation peak of intermediates can be seen on the reverse scan in the cyclic voltammograms. The RuAg/TiO2-C catalyst showed higher catalytic activity and better anti-poisoning ability for methanol oxidation than the commercial PtRu/C catalyst. The enhancement was owing to the strong interaction between RuAg nano alloy and TiO2-C support.