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Electrochemistry of ABTS at Glassy Carbon Electrodes
Han Zeng,Zhi-qiang Tang,Ling-wen Liao,Jing Kang,Yan-xia Chen*
Author NameAffiliationE-mail
Han Zeng Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Zhi-qiang Tang Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Ling-wen Liao Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Jing Kang Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Yan-xia Chen* Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China yachen@ustc.edu.cn 
Abstract:
The electrochemical and the mass transport behavior of ABTS2-/ABTS·- (2,20-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 ro-tating rate, rate constant, and transfer coefficient for ABTS2-?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 cm2/s, respectively. The transfer coefficient with a value of ca. 0.28 dif-fers 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·-+eredox reaction and/or the mass transport effect.
Key words:  Diffusional mediator, Enzymatic electrocatalysis, Rate constant, Diffusion coefficient, Electron transfer coefficient
FundProject:
玻碳电极上ABTS的电化学行为
曾涵,汤志强,廖铃文,康婧,陈艳霞*
摘要:
通过循环伏安法和旋转圆盘电极装置研究了2,2′-偶氮-双-(3-乙基苯并噻唑啉-6-磺酸)二铵盐(ABTS),ABTS2-和ABTS·-氧化还原对在pH=4.4的磷酸缓冲溶液中和玻碳电极上的电化学和传质行为. 由不同转速下记录的i-E曲线, 得到在磷酸缓冲溶液的电极反应速率常数和传递系数以及ABTS2-的扩散系数分别为4.6×10-3 cm/s、0.28和4.4×10-6 cm2
关键词:  扩散中介体,酶的电催化,速率常数,扩散系数,传递系数
DOI:10.1088/1674-0068/24/06/653-658
分类号: