Conducting silk-based electrodes

An electrode material comprising:

• a non-woven silk-fibroin mesh substrate;
• glycerol;
• and
• a conductive polymeric material, wherein:
• 40-65% of the silk-fibroin in the non-woven mesh substrate is in the form of β-sheets;
• and
• the electrode material is stretchable;
• and
• wherein the non-woven silk-fibroin mesh substrate is porous and has a top surface and a bottom surface and an interior portion formed by a plurality of silk-fibroin fibers attached to one another in a random fashion,
• wherein the non-woven silk-fibroin mesh substrate has a plurality of pores in the top surface, bottom surface and throughout the interior portion,
• wherein the silk-fibroin fibers in the top surface, the bottom surface and at least part of the interior portion are coated with the glycerol and the conductive polymeric material, and the glycerol and conductive polymeric material are found in at least a portion of the plurality of pores, and
• wherein the water vapour transmission rate (WVTR) is:
• from 40 to 60 g·m2·h-1 when measured at 20° C. using ASTM E96-95;
• or
• from 100 to 130 g·m2·h-1 when measured at 37° C. using ASTM E96-95.