The present article reports the synthesis of nanocomposites of polypyrrole along with non-precious metal
chalcogenide, cobalt-disulfide. A simple sonoelectrochemical method was carried out in order to fabricate
novel composite electrode materials composing polypyrrole, CoS2 and decorated Pt nanoparticles on
multi walled carbon nanotubes, MWCNTs. Studying on electrocatalytic activity revealed that the presence
of CoS2 nanoparticles along with MWCNTs and Pt nanoparticles played a prominent role in enhancement
of proton reduction to hydrogen gas. The possible mechanism of electrocatalytic activity by
nanocomposite films is also discussed. The PPy(CoS2)MWCNTsPt nanocomposite film exhibits extremely
low overpotential (0.03 V vs. RHE), and high current density for HER in acidic solution. The activity
enhancement can be attributed to the large active electrochemical surface area of MWCNTs and also porous
structure of PPy provides excellent attachment of CoS2 and Pt nanostructures to the matrix. In addition,
the HER is further improved due to stronger adsorption of hydrogen to the disulfide anions in CoS2
structures.
