Pt／H-TiO2催化剂制备及其甲醇电催化氧化性能  

Preparation of Pt/H-TiO_2 Catalyst with Improved Catalytic Performance for Methanol Electrooxidation

作　　者：韩金[1] 周志有[1] 汪强[1] 吕妙强[1] 陈驰[1,2] 孙世刚[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室、化学化工学院化学系,福建厦门361005 [2]华东理工大学化学工程国家重点实验室,上海200237

出　　处：《电化学》2014年第2期110-115,共6页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.20933004)资助

摘　　要：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H：气氛，将其550oC热处理2h，即得有氧缺陷和T一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．White TiO2 nanorods were synthesized by hydrothermal method with TIC14 as a precursor. As-synthesized TiO2 nanorods were further subjected to high-temperature （550 ~C） heat treatment for 2 h under H2 atmosphere to prepare gray black hydrogen-treated TiO2 （H-TiO2） nanorods with oxygen vacancies and Ti3＋ interstitial atoms. The Pt nanoparticles of 1.9 nm were supported on these two types of TiO~ nanorods to form Pt/TiO~ and Pt/H-TiO2 catalysts. XRD data indicates that the crystal structure of TiO2 was still reserved as rutile after hydrogen treatment, but the surface was covered by some Ti-OH species, as evidenced by XPS test. Electrochemical tests demonstrate that the oxygen vacancies of H-TiO2 can enhance the adsorption/desorption of oxygen on Pt nanoparticles, which promotes the electrocatalytic activity of H-TiOz towards methanol oxidation. As a result, the peak current density of methanol oxidation on Pt/H-TiO2 was 1.6 and 2.1 times those of methanol oxidation on Pt/TiO2 and Pt/C, respectively.

关 键 词：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 

分 类 号：TQ426[化学工程]