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Silica-carbon hydrogels as cytocompatible bioelectrodes.

Benjamin Le Ouay¹, Thibaud Coradin, Christel Laberty-Robert

¹UPMC Univ. Paris 06, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Collège de France, 11 place Marcelin Berthelot, F-75005 Paris, France. christel.laberty@upmc.fr.

Journal of Materials Chemistry. B

|April 9, 2020

Summary

Researchers developed novel bioelectrodes by embedding bacteria within silica hydrogel and graphite felt. These bioelectrodes efficiently convert glucose into oxidizable metabolites, demonstrating potential for biosensing applications.

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Area of Science:

Biotechnology
Materials Science
Electrochemistry

Background:

Bioelectrodes are crucial for biosensing and biofuel cells.
Developing efficient electrode materials that support microbial activity is an ongoing challenge.
Graphite felt offers a conductive scaffold, while silica hydrogels can immobilize biological components.

Purpose of the Study:

To create a novel bioelectrode material by combining bacteria, silica hydrogel, and graphite felt.
To investigate the electrochemical activity of encapsulated bacteria for glucose conversion.
To assess the potential of this bioelectrode for biosensing or energy conversion.

Main Methods:

Bacteria were encapsulated within a silica hydrogel matrix.
The silica hydrogel-bacteria composite was integrated into the pores of graphite felt.
Electrochemical oxidation of glucose-derived metabolites at the graphite surface was monitored.

Main Results:

The bioelectrode demonstrated the conversion of glucose into metabolites.
These metabolites diffused through the silica hydrogel mesopores.
The metabolites were successfully oxidized at the conductive graphite felt surface.

Conclusions:

The developed bioelectrode effectively utilizes encapsulated bacteria for glucose metabolism and electrochemical oxidation.
This composite material shows promise for applications in biosensors and bioelectrochemical systems.
The combination of silica hydrogel and graphite felt provides a suitable environment for bioelectrocatalysis.