CO在铂修饰的氧化钛电极上电催化氧化行为的研究

通过阴极还原-阳极氧化法制备了Pt—TiO2／Ti电极，研究了CO在该电极上的电化学行为和电极制备条件对CO电催化氧化的影响．结果表明，与Pt电极相比．CO在Pt—TiO2／Ti电极上的氧化峰峰电位负移了100mV，并且表现出较好的稳定性．通过XPS技术对Pt—TiO2／Ti电极进行了表征．发现Pt以金属形式存在，Ti以TiO2形式存在．Pt—TiO2／Ti电极能抗CO中毒的原因可能是因为TiO2的掺杂使引起催化剂中毒的桥式吸附的CO物种在复合催化剂上的吸附率较低所致．

Studies on Electrocatalytic Performance of Titanium Oxide Electrode Modified with Pt Toward Oxidation of CO

Electrocatalytic performance of the Pt-TiO x/Ti electrode prepared with electrochemical reduction-oxidation method toward the oxidation of CO was studied. The effects of preparation conditions on the electrocatalytic oxidation of CO were also investigated. The experimental results show that the Pt-TiO x/Ti electrode has a high electrocatalytic activity, which was manifested through the negative shift of the peak potential in the positive scanning of the cyclic voltammogram, and good stability for the electrocatalytic oxidation of CO. By means of XPS techniques, it is found that the Pt in the Pt-TiO x/Ti electrode is in a state of metal and the Ti is in a state of TiO x. The reason for the electrode to exhibit an excellent performance is attributed to the high dispersion between nanosized Pt and TiO x particles and the low adsorption ability of the CO on the electrode surface is due to the interaction between Pt and TiO x.