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Geobacter sulfurreducens is an essential microorganism in biogeochemical cycles. It is used biotechnologically in bioremediation and electricity production. The importance of G. sulfurreducens lies in its capacity to contact extracellular electron acceptors, including several electrode materials. Taking advantage of the versatility of G. sulfurreducens to grow on different surfaces, it is possible to design and synthesize new electrodes that can expand and improve the applications of these bacteria. In this work, we performed multidisciplinary research studies to demonstrate an innovative application of this well-known microbial system. The interaction between fluorine-doped tin oxide (FTO) and ordinary glass with G. sulfurreducens was enhanced by modifying the surface with Fe₂O₃ films. As confocal laser microscopy analyses revealed, the enhancement promoted biofilm development, whose parameters were …