Biocathode and zinc-oxygen cell including said biocathode

A biocathode comprises an electrode, characterised in that the electrode is modified with metal oxide nanoparticles and adsorbed enzyme. A method of fabricating such a biocathode is also disclosed, characterised in that it includes the stage of enzyme adsorption on the surface of the electrode, modified with metal oxide nanoparticles, by immersing the electrode in the enzyme solution. In addition, a zinc-oxygen cell, comprising a zinc anode, an electrolyte and such a biocathode is disclosed. The electrode may be an indium tin oxide (ITO) film coated glass electrode, a thin fluorine tin oxide (FTO) film coated glass electrode, a glassy carbon electrode or a gold electrode. The metal oxide nanoparticles are preferably indium tin oxide nanoparticles, and the enzyme is preferably bilrubin oxidase.