title: Enhancing the Bipolar Redox Cycling Efficiency of Plane-Recessed Microelectrode Arrays by Adding a Chemically Irreversible Interferent.
abstract: The individual electrochemical anodic responses of dopamine (DA), epinephrine (EP), and pyrocatechol (CT) were investigated at arrays of recessed gold disk-microelectrodes arrays (MEAs) covered by a gold plane electrode and compared to those of their binary mixture (CT and EP) when the top-plane electrode was operated as a bipolar electrode or as a collector. The interferent species (EP) displays a chemically irreversible wave over the same potential range as the chemically reversible ones of DA or CT. As expected, in the generator-collector (GC) mode, EP did not contribute to the redox cycling amplification that occurred only for DA or CT. Conversely, in the bipolar mode, the presence of EP drastically increased the bipolar redox cycling efficiency of DA and CT. This evidenced that the chemically irreversible oxidation of EP at the anodic poles of the top plane floating electrode provided additional electron fluxes that were used to more efficiently reduce the oxidized DA or CT species at the cathodic poles. This suggests an easy experimental strategy for enhancing the bipolar efficiency of MEAs up to reach a performance identical to that achieved when the same MEAs are operated in a GC mode.
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China.
authors.forename: Dingwen
authors.initials: D
authors.lastname: He
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Yan
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhu
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China.
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, PR China.
authors.forename: Bingwei
authors.initials: B
authors.lastname: Mao
authors.affiliation: CNRS UMR 8640 "PASTEUR", Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University , Département de Chimie, 24 rue Lhomond, Paris 75005, France.
authors.forename: Alexander
authors.initials: A
authors.lastname: Oleinick
authors.affiliation: CNRS UMR 8640 "PASTEUR", Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University , Département de Chimie, 24 rue Lhomond, Paris 75005, France.
authors.forename: Irina
authors.initials: I
authors.lastname: Svir
authors.affiliation: CNRS UMR 8640 "PASTEUR", Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University , Département de Chimie, 24 rue Lhomond, Paris 75005, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Amatore
mesh_terms: D002396:Catechols / Q000032:analysis*; D004298:Dopamine / Q000032:analysis*; D055664:Electrochemical Techniques; D004837:Epinephrine / Q000032:analysis*; D006046:Gold / Q000737:chemistry; D008839:Microelectrodes; D010084:Oxidation-Reduction
chemical_list: D002396:Catechols; D006046:Gold; C034221:catechol; D004298:Dopamine; D004837:Epinephrine