Non-noble Mental As Electrocatalyst Towards Hydrogen Evolution Reaction

As an efficient and clean energy carrier, hydrogen has been proposed as a promising substitution for traditional energy. Solid polymer electrolytr water electrolysis technology is considered to be an attractive method to produce the renewable energy carrier. However, the high cost of electrolyzer has been a big barrier for its wide application and commercialization. In order to reduce cost,we need to find low-cost and efficient electrocatalysts towards hydrogen evolution reaction(HER).As a non-noble metal compound, MoS2 has been commonly investigated as a electrocatalyst for HER. In this paper, nanostructured MoS2 with different morphologies were prepared with two diffierernt kinds of precursors. Studied their electrocatalytic properties towards the hydrogen evolution reaction and found that MoS2 nanosheets exhibited higher catalytic activity than MoS2 nanoparticles. we developed a selective solvothermal synthesis of MoS2 nanoparticles on reduced graphene oxide(RGO). The resulting MoS2/RGO hybrid material exhibited superior electrocatalytic activity, with overpotentials of 183 mV at the current density of 10 mA cm-2 and a Tafel slope of 40.8 mV dec-1. MoS2-Ni2P/reduced graphene oxide(RGO) has been prepared by a solvothermal reaction. It was characterized by SEM, TEM and XRD. The MoS2-Ni2P/RGO composite exhibits high HER activity in the acidic media, with overpotentials of 160 mV at the current density of 10 mA cm-2 and a low Tafel slope of 35.9 mV dec-1. The synergistic effect of the combination of Ni2 P and MoS2 is attributed to hydrogen spillover from Ni2 P to MoS2.Transition metal phosphide is anthor kind of electrocatalyst for HER which has been commonly investigated. In this paper, Ni2 P and CoP nanoparticles were synthesized from the decomposition of hypophosphite precursors. CoP has a lower onset potential than Ni2 P. CoP nanowire arrays on carbon paper was prepared via low-temperature phosphidation of the corresponding Co(OH)F/carbon paper precursor. The CoP/carbon paper, as a robust integrated three-dimensional(3D) hydrogen evolving cathode, shows a a small Tafel slope of 53.5 mV dec-1, and with overpotentials of 114 mV at the current density of 10 mA cm-2. A self-assembled graphene hydrogel can be synthesized from graphene oxide aqueous dispersion through a hydrothermal reaction. 3D architecture of CoP nanowire with 2D graphene sheets has been developed by a one-step hydrothermal method. The composite exhibits high HER activity in the acidic media, with overpotentials of 137 mV at the current density of 10 mA cm-2 and a low Tafel slope of 57.6 mV dec-1.