摘要
将硫堇电聚合在氧化石墨烯修饰的ITO电极上,制备了石墨烯/聚硫堇光电极。该光电极作为光敏界面和电子受体,可模拟过氧化氢酶的功能,对电子供体过氧化氢催化氧化的表观米氏常数达到0.143mmol·L^(-1)。该光电极中的氧化石墨烯减小了聚硫堇激发态与ITO电极之间的带隙,提高了光电极的光电转化效率,对过氧化氢具有快速的光电化学响应。由该光电极组成的光致电化学测量系统,光电转化效率快,在5.00×10^(-7)~1.00×10^(-4) mmol·L^(-1)的浓度范围内,可对过氧化氢实现高灵敏度的流控分析。
In the paper,the thionine is electropolymerized on the surface of ITO electrode fixed grapheneoxide to fabricate a photoelectrochemical bionic electrode.The photoelectrode as photosensitive interface and an electron acceptor,can simulate the function of catalase to catalyze the oxidation of hydrogen peroxide,and the apparent Michaelis-Mentenconstant is 0.143mmmol·L^-1 for the hydrogen peroxide as the electron donor.The graphene oxide in the photoelectrode reduced the band gap between the excited polythionineand ITO electrode to improve the photoelectric conversion efficiency of photoelectrode,resulting in a fast photoelectrochemical response to hydrogen peroxide.The photoelectrochemically measurement system composed by thephotoelectrode,photoelectric conversion efficiency is quickly,can achieve a controllable flow analysis with high sensitivity to hydrogen peroxidewithin the concentration rangeof 5.00×10^-7—1.00×10^-4 mmol·L^-1.
出处
《青岛科技大学学报（自然科学版）》
CAS
2016年第4期365-370,共6页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
山东省自然科学基金项目(2009ZRB01393)
关键词
光电化学
氧化石墨烯
硫堇
过氧化氢
流控分析
photoelectrochemistry
grapheneoxide
thionine
hydrogen peroxide
controllable flow analysis
