Enzyme modified electrodes for dioxygen reduction are often employed as cathodes in biofuel cells [1]. Some concepts of biofuel cells (BFC) involve anode modified with glucose oxidase. This enzyme is not specific for glucose electrooxidation, but dioxygen acts also as a substrate. Direct enzymatic oxidation of glucose by dioxygen is a side effect for bioanode, so there is current interest to apply dioxygen-free anodic compartment in BFC. On the other side, splitting of common electrolyte to two electrodes compartments using membrane and device-case causes increase of BFC size and cost of it. Gas phase biocathode made of porous material has already been poroposed [2].
In this work we employed carbon ceramic electrode (CCE) [3] modified with bilirubin oxidase for bioelectroreduction of dioxygen with use of deaerated electrolyte. Voltametric examnation was performed with different dioxygen partial pressures exerted on back side of this composite electrode. Dioxygen transport in porous, hydrophobic silicate (component of CCE) was examined using generation-collection mode scanning electrochemical microscopy [4].

[1] I. Willner, Y. Yan, B. Willner, R. Tel-Vered, Fuel Cells 1 (2009) 7
[2] A. Habrioux, G. Merle, K. Servat, K.B. Kokoh, C. Innocent, M. Cretin, S. Tingry, J. Electroanal. Chem. 622 (2008) 97
[3] M. Tsionsky, G. Gun, V. Glezer, O. Lev, Anal. Chem. 66 (1994) 1747
[4] G. Wittstock, M. Burchardt, S. Pust, Y. Shen, C. Zhao, Angew. Chem. Int. Ed. 46 (2007) 1584

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