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Fabrication of high surface area graphene electrodes with high performance towards enzymatic oxygen reduction

AutorDi Bari, Chiara; Goñi-Urtiaga, Asier; Pita, Marcos ; Shleev, Sergey; Toscano, Miguel D.; Sainz, Raquel; Lacey, Antonio L. de
Fecha de publicaciónjun-2016
Citación6th workshop Early Stage Researchers in Nanoscience (2016)
ResumenGraphene-based electrodes have been used for several applications, such as biosensing or as support for further immobilization of enzymes for the preparation of biocathodes and/ or bioanodes. In order to overcome the low reproducibility of the current fabrication methods of graphene-based electrodes, in the present work the electrodeposition of graphene oxide and its simultaneous electrochemical reduction on the electrode surface is proposed as a reproducible method for the fabrication of stable and high surface area electrodes. The electrodeposition process was optimized in terms of pH and conductivity of the solution and the obtained graphene electrodes were characterized by X-ray photoelectron spectroscopy, Fourirer transform infrared spectroscopy, scanning electron microscopy and electrochemical methods (cyclic voltammetry and impendanc e spectroscopy). The characterization results indicate that electrochemical reduction of GO yielded a highly porous conductive surface that has still oxygen based functional groups. These functional groups have been used to immobilize two distint biocatalysts: laccase and bilirubin oxidase. The enzymatic electrodes were tested as direct electron transfer based biocathodes and catalytic currents as high as 1 mA/cm2 were obtained.
DescripciónTrabajo presentado en el 6th workshop Early Stage Researchers in Nanoscience, celebrado en Madrid el 22 y 23 de junio de 2016.
URIhttp://hdl.handle.net/10261/163995
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