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Relation of anodic and cathodic performance to pH variations in membraneless microbial fuel cells

pubblicazioni - Articolo ISI

Relation of anodic and cathodic performance to pH variations in membraneless microbial fuel cells

They are presented the results of an experiment to investigate the electrochemical performance (and chemical, obtaining the related Pourbaix diagrams) to vary the pH of the solution (waste water and sodium acetate), the microbial fuel cell to single compartment with graphite electrodes.

One-compartment (membraneless) microbial fuel cells (MFCs) are effective tools to test new bio-technology at a laboratory level. More efforts in MFC design and materials are necessary to move from laboratory tests to real applications. In such a context, this paper presents the experimental results that investigate pH variations of three single chambered and membraneless MFCs having positive and negative electrodes made of graphite-based materials without any addition of chemical catalysts. MFCs were built and operated with raw wastewater (inoculum) and sodium acetate as substrates. The progression of the power in the MFC and the relationship between performances and induced pH variation (from pH 6.7 to 10.2) will be discussed. A general connection between SEM images, chemical analyses, pH trends and reactions in the MFCs will be attempted, by connecting all processes with thermodynamic and chemical equilibria considerations.

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