Highly Efficient MoS2/Ag2S/Ag Photoelectrocatalyst Obtained from a Recycled DVD Surface

An efficient photoelectrocatalyst for hydrogen evolution reaction (HER) was prepared by electrochemical deposition of MoS 2 on the Ag nanostructured surface of a commercial writable digital versatile disc (DVD). The deposition was performed by reduction of MoS 4 2– ions and the concomitant production of HS – ions led to the formation of Ag 2 S nanoparticles. The result was a composite material MoS 2 /Ag 2 S/Ag characterized by the formation of uniformly distributed n–p nanojunctions that make the performances of this easy to prepare and cheap electrocatalyst comparable or better than those of similar MoS 2 based systems. This study suggests a viable opportunity to turn an abundant waste into an added-value material.