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电化学  2014 

Pt/H-TiO2催化剂制备及其甲醇电催化氧化性能

DOI: 10.13208/j.electrochem.130418, PP. 110-115

Keywords: 铂纳米粒子,TiO2纳米棒,氢处理,甲醇电氧化,氧缺陷,Ti3+填隙原子

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Abstract:

以四氯化钛为前驱体,采用水热法合成二氧化钛纳米棒(TiO2,白色),在纯H2气氛,将其550oC热处理2h,即得有氧缺陷和Ti3+填隙原子的二氧化钛纳米棒(H-TiO2,灰黑色).将Pt纳米粒子(~1.9nm)负载于此两种二氧化钛纳米棒上,制得Pt/TiO2和Pt/H-TiO2催化剂.XRD和XPS测试表明,氢处理TiO2晶型没有变化,仍属金红石型,但增加了Ti-OH表面物种.电化学测试表明,H-TiO2载体能够增强氧在Pt表面的吸脱附能力,从而提高其甲醇电催化氧化活性,Pt/H-TiO2电极甲醇氧化峰电流密度为Pt/TiO2电极的1.6倍、Pt/C电极的2.1倍.

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