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电化学(中英文) ›› 2014, Vol. 20 ›› Issue (2): 110-115.  doi: 10.13208/j.electrochem.130418

• 研究论文 • 上一篇    下一篇

Pt/H-TiO2催化剂制备及其甲醇电催化氧化性能

韩金1,周志有1*,汪强1,吕妙强1,陈驰1,2,孙世刚1   

  1. 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
  • 收稿日期:2013-04-17 修回日期:2013-05-16 出版日期:2014-04-28 发布日期:2014-04-17
  • 通讯作者: 周志有 E-mail:zhouzy@xmu.edu.cn
  • 基金资助:

    国家自然科学基金项目(No. 20933004)资助

Preparation of Pt/H-TiO2 Catalyst with Improved Catalytic Performance for Methanol Electrooxidation

HAN Jin1, ZHOU Zhi-you1*, WANG Qiang1, LV Miao-qiang1, CHEN Chi1,2, SUN Shi-gang1   

  1. 1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2013-04-17 Revised:2013-05-16 Published:2014-04-28 Online:2014-04-17
  • Contact: ZHOU Zhi-you E-mail:zhouzy@xmu.edu.cn

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H2气氛,将其550 oC热处理2 h,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(~ 1.9 nm)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.

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

Abstract: White TiO2 nanorods were synthesized by hydrothermal method with TiCl4 as a precursor. As-synthesized TiO2 nanorods were further subjected to high-temperature (550 oC) 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 TiO2 nanorods to form Pt/TiO2 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-TiO2 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.

Key words: platinum nanoparticles, TiO2 nanorods, hydrogen treatment, methanol electrooxidation, oxygen vacancy, Ti3+ interstitial atom

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