“…Pt-based electrodes.M oS 2 -based composite materials such as multi-walled carbon nanotubes (CNTs)-Cu-MoS 2 , [4] three-dimensional MoS 2 /reduced graphene oxide, [5] Cu-MoS 2 /reduced graphene oxide, [6] CoP/MoS 2 -CNTs hybrid catalyst, [7] and the metal-organic framework (MOF)-derivede lectrocatalysts Mo-N/C@MoS 2 , [8] represent improved electrode materials for cost-effective HER.Ar obusth ydrogen-evolution catalyst was revealed in ac arbon-supported, non-noble metal catalyst based on high-index (222)-faceted Ta Cn anocrystals (TaC NCs@C). [9] Tr ansitionm etal phosphides (TMPs) such as CoP, [7,10,11] MoP, [12] Ni 2 P, [13] Ni 12 P 5 , [14,15] and FeP, [16] in combinationw ith different carbon materials (carbon nanosheets, CNTs,g raphene carbono xides,o rn itrogen-dopedr educed graphene oxide) are considered to be effective electrocatalysts due to the extraordinary high conductivity and enhanced electrocatalytic HER performance.R ecently,i tw as discovered that solid structures designed from monodispersed metal phosphides( M x P y )e xhibit superior catalytic activity due to the higher positivec harge of the metal and stronger ensemble effect of Pi nM x P y structures. [17,18] TMPs can be regarded as crystall atticeso ft ransition metals doped with P. Until now, it has been determined that only six different transition metals (Fe, Co,N i, Cu, Mo,a nd W) form efficient TMPs for HER.…”