Wearable and flexible electrochemical sweat sensor consisting of a polymer composite membrane containing graphene

A multi-composite electrochemical cell substantially consists of a thin polymer membrane including three different adjacent sectors, which are made of the same appropriately seamlessly modified polymer, incorporating in the polymer one or more conductive phases, or conductive fillers, such as graphene, metal, or a combination thereof. In the first sector the polymer material incorporates graphene nanoplatelets and acts as a cathode; in the second sector, interposed between the other two, the polymer material acts as an insulating spacer; in the third sector the polymer material incorporates graphene nanoplatelets and a metal filler or immersed metal contact rheophore, with negative standard reduction potential, and acts as an anode; wherein the metal filler is in the form of dispersed powder or dispersed flakes, or of a thin sheet incorporated in the polymer.