期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
石墨掺杂纳米TiO2及其电催化性能研究
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1. 湖北工程学院 新技术学院, 湖北 孝感 432000;
2. 湖北工程学院 化学与材料学院, 湖北 孝感 432000 -
DOI：10.13763/j.cnki.jhebnu.nse.2015.06.010
Preparation and Electrocatalytic Properties of Graphite Doped Nano-TiO2
摘要/Abstract
石墨掺杂TiO2可以有效延长TiO2电子-空穴对的复合时间, 从而提高其电催化活性.采用溶胶-凝胶法并结合高能球磨法制备了石墨掺杂纳米TiO2, 设计正交试验优化合成条件.用SEM, XRD表征了样品的形貌和晶体结构, 用循环伏安法测试了TiO2粉末电极对亚铁氰化钾的电催化性能.结果表明:纯TiO2均为锐钛矿, 晶粒尺寸随烧结温度的升高而增大, 最大为27.3nm.掺入石墨过程中, 为了不破坏石墨的晶体结构, 球磨时间不宜超过2h.石墨掺杂纳米TiO2的氧化峰电流平均值最高为328.1μA, 比纯TiO2提高了50.3%.影响石墨掺杂纳米TiO2电催化活性主要因素的大小顺序为石墨掺杂量 >球磨时间 >烧结时间 >烧结温度.
Electron-hole pair recombination time of TiO2 can be effectively prolonged by doping TiO2 with graphite.And its electrocatalytic activity can be accordingly improve.The composite particles were prepared by sol-gel method combined with high energy ball milling(HEBM).Orthogonal experiments were carried out to study the optimal synthesis conditions.The morphology and crystal structures of nano-TiO2 and graphite doped nano-TiO2(C/TiO2) were characterized by scanning electron microscopy(SEM) and X-ray powder diffraction(XRD).The electrocatalytic activity of C/TiO2 modified electrodes in K4Fe(CN)6 was tested by cyclic voltammetery.The results show that nano-TiO2 are all anatase phase,and the crystalline becomes more perfect with the increasing sintering temperature.Nano-TiO2 doped with graphite had better milling within 2 hours to keep the normal crystalline of graphite.The highest ip value of graphite doped nano-TiO2 samples is 50.3% higher than that of pure nano-TiO2.The effect sequence of the factors on the electrochemical catalytic performance of graphite doped nano-TiO2 are graphite doping amount,milling time,sintering time and sintering temperature,respectively.
关键词
参考文献 11
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