纳米复合结构Pt/TiC/TiO_2催化剂的合成及催化甲醇氧化性能  

Systhesis and Catalytic Methanol Oxidation Performance of Pt/TiC/TiO_2 Catalyst with Nano-Composite Structure

作　　者：陈传胜[1] 张雪茹 郑家房[1] 郭亚男 田茶 张青[1] CHEN Chuansheng;ZHANG Xueru;ZHENG Jiafang;GUO Yanan;TIAN Cha;ZHANG Qing(Department of Mechanical Engineering,Anhui Vocational and Technical College,Hefei 230011,China;Instrumental Analysis Center;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽职业技术学院机械工程学院,合肥230011 [2]合肥工业大学分析测试中心,合肥230009 [3]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《机械工程材料》2018年第8期42-47,共6页Materials For Mechanical Engineering

基　　金：安徽省高等学校自然科学研究资助项目(KJ2016SD31)

摘　　要：确定了水热法制备TiO_2纳米线的最佳参数,对采用最佳参数制备的TiO_2纳米线进行碳化处理,再在其表面沉积铂得到Pt/TiC/TiO_2催化剂,研究了不同阶段产物的物相组成、化学成分和微观形貌,测试了Pt/TiC/TiO_2催化剂的催化甲醇氧化能力。结果表明:最佳水热参数为NaOH溶液浓度1 mol·L-1、水热温度160℃、水热时间20h,所得TiO_2纳米线的直径约为100nm、长度超过1μm;碳化后得到了TiC/TiO_2纳米线,沉积铂后,其表面被纳米级铂颗粒所覆盖;Pt/TiC/TiO_2催化剂催化甲醇氧化的起始氧化电位(对比Ag/AgCl)为0.34V,比Pt/TiO_2催化剂催化下的负移了约0.15V,其正扫电流密度峰值比Pt/TiO_2催化剂催化下的大8倍以上,碳化明显提高了Pt/TiO_2催化剂催化甲醇氧化的能力。Optimal parameters of TiO2 nanowires prepared by hydrothermal method were determined.TiO2 nanowires prepared with the optimal parameters were treated by carbonization and surface deposited with platinum,and then the Pt/TiC/TiO2 catalyst was obtained. The phase composition, chemical composition and micromorphology of the products in different stages were investigated,and the catalytic methonal oxidation capability of Pt/TiC/TiO2 catalyst was tested.The results show that the optimal hydrothermal parameters were listed as follows：NaOH solution concentration of 1 mol·L-1,hydrothermal temperature of 160 ℃,and hydrothermal time of 20 h.Consequently,TiO2 nanowires with diameter of about 100 nm and length of over 1μm were obtained.The TiC/TiO2 nanowires were obtained after carbonization and the surface was coated with platinum nanoparticles after the deposition of platinum.The initial oxidation potential of methanol oxidation catalyzed by Pt/TiC/TiO2 catalyst was 0.34 V（vs Ag/AgCl）,about 0.15 Vnegative shift compared with that by Pt/TiO2 catalyst,and the maximum forward current density was more than 8 times as large as that by Pt/TiO2 catalyst.The carbonization improved the catalytic methanol oxidation capability of Pt/TiO2 catalyst significantly.

关 键 词：水热法 纳米线 复合纳米结构 Pt/TiC/TiO2催化剂 甲醇氧化 

分 类 号：O646.5[理学—物理化学]