English: a Schematic of an introduced catalyst (green dot) in a memristor that facilitates the cathodic reduction by (b) bringing down the reduction overpotential (∆E), which leads to (c) a decrease in the switching voltage (∆Vth). d TEM images of a G. sulfurreducens and purified protein nanowires (right) harvested from G. sulfurreducens. Scale bars, 1 µm (left) and 100 nm (right). e Schematic of introduced protein nanowires in a memristor that facilitate the cathodic reduction of Ag+ to attain possible bio-voltage switching.