Electrochemistry of ABTS at Glassy Carbon Electrodes  

玻碳电极上ABTS的电化学行为

作　　者：曾涵[1] 汤志强[1] 廖铃文[1] 康婧[1] 陈艳霞[1] 

机构地区：[1]中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2011年第6期653-658,I0003,共7页化学物理学报（英文）

基　　金：This work was supported by one hundred Talents＇ Program of the Chinese Academy of Science, the National Natural Science Foundation of China （No.21073176）, 973 Program from the Ministry of Science and Technology of China （No.2010CB923302）.

摘　　要：The electrochemical and the mass transport behavior of ABTS2-/ABTS＇- （2,2＇-azinobis（3- ethylbenzothiazoline-6-sulfonate）） redox couple at glassy carbon electrode （GCE） in phos- phate buffer solution （PBS, pH=4.4） is studied in detail by cyclic voltammetry combined with rotating disk electrode system. From the i-E curves recorded at different electrode rotating rate, rate constant, and transfer coefficient for ABTS 2-←→ABTS^-＋e reaction at GCE electrode and the diffusion coefficient of ABTS2- in PBS are estimated to be 4.6× 10^-3 cm/s, 0.28, and 4.4× 10^-6 cm^2/s, respectively. The transfer coefficient with a value of ca. 0.28 differs largely from the value of 0.5 that is always assumed in the literature. The origins for the difference of the rate constant determined and the challenges for estimating the stan- dard rate constant are discussed. The performance for such ABTS2- mediated bio-cathode toward oxygen reduction reaction is discussed according to the over-potential drop as well as current output limit associated with the charge transfer kinetics of ABTS2- ←→ABTS-＋e redox reaction and/or the mass transport effect.

关 键 词：Diffusional mediator Enzymatic electrocatalysis Rate constant Diffusion coefficient Electron transfer coefficient 

分 类 号：O[理学]