A slurry electrode based on reduced graphene oxide and poly(sodium 4-styrenesulfonate) for applications in microbial electrochemical technologies

A reduced graphene oxide slurry electrode was prepared via electrochemical reduction of graphene oxide, using anionic surfactant poly(sodium 4-styrenesulfonate) to stabilise the suspension. The slurry electrode was characterised for its electrochemical and rheological properties and tested for its application in a microbial electrochemical system under both static and fluidised conditions. Thanks to the high ratio of lateral dimension to thickness, reduced graphene oxide allowed electronic percolation at a particles loading of only 2% (wt.), which is significantly lower than typically applied with other graphitic materials such as activated carbon. The slurry displayed shear thinning behaviour, which is advantageous in real scale applications to guaranteeing homogeneity during fluidisation and to prevent sedimentation under static conditions. When tested under fluidised conditions in a microbial electrochemical device seeded with a mixed microbial consortium, the slurry enabled a 4.7x improvement of catalytic current production compared to static conditions. This approach may represent an important step toward increasing competitiveness and applicability of microbial electrochemical technologies.

Informació addicional

  • Any: 2022
  • Autors: Matabosch Coromina, Helena; Antonio Cuffaro, Giovannia; Tommasi, Tonia; Puig, Sebastià; Virdis, Bernardino
  • Referència: Journal of Electroanalytical Chemistry, Volume 9201, September 2022, Article number 116546

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Laboratori d’Enginyeria Química i Ambiental

Institut de Medi Ambient
Universitat de Girona
Campus Montilivi
17003 Girona

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Edifici Jaume Casademont, Porta B
Pic de Peguera, 15
17003 Girona
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