Metallic silver with a nanofilament morphology was directly formed on electrodes with a combination of electrochemical processes and a silver halide photography development reaction. Metallic silver was first electrodeposited on a substrate electrode, and then converted to silver iodide through a combined electrochemical/chemical process. The silver iodide on the electrode was then treated with a photographic developer solution, giving metallic silver with the nanofilament morphology. The use of carbon paper as the substrate electrode gave superior adhesive stability of the nanofilaments for future functionalization.