CO在铂修饰的氧化钛电极上电催化氧化行为的研究

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

通过阴极还原 -阳极氧化法制备了 Pt-Ti O2 /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-Ti O2 /Ti电极上的氧化峰峰电位负移了1 0 0 m V,并且表现出较好的稳定性 .通过 XPS技术对 Pt-Ti O2 /Ti电极进行了表征 ,发现 Pt以金属形式存在 ,Ti以 Ti O2 形式存在 .Pt-Ti O2 /Ti电极能抗 CO中毒的原因可能是因为 Ti O2 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 .

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.