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研究论文

Pt/H-TiO2催化剂制备及其甲醇电催化氧化性能

  • 韩金 ,
  • 周志有 ,
  • 汪强 ,
  • 吕妙强 ,
  • 陈驰 ,
  • 孙世刚
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  • 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

  网络出版日期: 2014-04-17

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 Jin ,
  • ZHOU Zhi-You ,
  • WANG Qiang ,
  • LV Miao-Qiang ,
  • CHEN Chi ,
  • SUN Shi-Gang
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  • 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 date: 2013-04-17

  Revised date: 2013-05-16

  Online published: 2014-04-17

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.

本文引用格式

韩金 , 周志有 , 汪强 , 吕妙强 , 陈驰 , 孙世刚 . Pt/H-TiO2催化剂制备及其甲醇电催化氧化性能[J]. 电化学, 2014 , 20(2) : 110 -115 . DOI: 10.13208/j.electrochem.130418

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.
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