铂复合材料的制备及电化学性能研究.pdf

第28卷第4期
无机化学学报
Vol28 No 4
2012年4月
CHINESE JOURNAL OF INORGANIC CHEMISTRY
751-756
石墨烯/铂复合材料的制备及电化学性能研究
牛玉莲肖雪清顾志国李在均*
(江南大学化学与材料工程学院,无锡214122
摘要:采用 Hummers法制备氧化石墨,再超声分散于去离子水中形成稳定的氧化石墨分散液。分散液与氯铂酸溶液混合后,氧
化石墨烯还原氯铂酸产生大量铂纳米粒子,铂粒子被牢固地在氧化石墨烯片上,最后将所得到的氧化石墨烯/铂复合物置于
管式炉中在ArH2气氛中于800℃下热裂解制备出石墨烯/铂复合材料。形貌与纳米结构分析表明,氧化石墨已被彻底还原成石
墨烯,铂纳米粒子均匀分散在褶鈹的石銎烯纳米片间。电化学阻抗研究进一步揭示复合材料的电子转移阻抗明显小于石墨烯,
呈示铂纳米粒子掺人石墨烯片层大大改善了导电性。石墨烯/铂复合材料应用于对苯二酚的电化学检测,检出限达1.6x107
lL1,这说明该材料具有优异的电催化性能
关键词:石墨烯;铂;复合材料;电催化
中图分类号:0613.71:0614.826文献标识码:A文章编号:10014861201204-0751-06
Synthesis and Electrochemical Property of the Graphene/Pt Composites
NIU Yu-lian XIAO Xue-qing GU Zhi-guo LI Zai-jun
(School ofchemical and Material Engineering, Jiangnan Uniwersity, Wuci, Jiangsu 214122, Ch
Abstract: Graphite oxide was prepared by Hummers'method and was dispersed in the deionized water with the
help of ultrasonic wave to form stable graphene oxide dispersion. After above dispersion was mixed with
chloroplatinic acid solution, the graphene oxide rapidly reduced chloroplatinic acid and produce great deal of
platinum nanoparticles, which were tightly anchored in the graphene oxide nanosheets. Finally, the obtained
graphene oxide/platinum composite was placed in a tube furnace and further reduced in an atmosphere of Ar/H2
under 800 to graphene/platinum composite. The characterization of morphology and nanostructure shows that
the graphite oxide has been thoroughly reduced to graphene and platinum nanoparticles were well dispersed in
between draped graphene nanosheets. The electrochemical impedance spectroscopy analysis further revealed the
electron transfer impedance of the composite is obviously lower than sole graphene, indicating that the
introduction of platinum particles remarkably improve the electrical conductivity. Moreover, the obtained
graphene/platinum composite was also applied to electrochemical determination of hydroquinone. The detection
limit was found to be 1. 6x10 mol L. This demonstrated the composite is of excellent elect
catalytic property
Key words: graphene; platinum; composite; electrocatalysis
石墨烯是单层碳原子紧密堆积形成的六方蜂从而限制了石墨烯在许多方面的应用。为了解决以
集状晶格结构的晶体り,它独特的二维结构使其具上问题,人们采用在石墨烯片层间掺杂金属纳米粒
有优异的电学、热学、力学及化学性质2,但石墨烯子,这不仅有效避免石墨烯片层因聚集而重新回到
片层间存在较大的范德华力,易发生堆积和聚集,石墨晶体,而且大大改善石墨烯材料的电子传导
收稿日期:2011-10-10。收修改稿日期:2011-12-0
国家自然科学基金(No.21176101,No.20771045资助项目。
通讯联系人。E-mail:zaijunlit@263.net