| 초록 |
New energy source is demanded due to global warming and lack of fossil fuel. Hydrogen is one of the promising energy as alternative. Although Pt is the best catalyst for Hydrogen Evolution Reaction (HER), its high cost and scarcity inhibit the application. For that reason, new catalysts such as Ni-alloy, Transition Metal Dichalcogenides (MX2, M=Mo, W / X=S, Se, Te) have been explored by researchers. MoS2 has attracted great attention because of its high activity and stability while bulk MoS2, which is semi-conducting, is poor catalyst. Herein, we introduce highly active, efficient electrode which has lots of MoS2 edge site. First, Ni/Cu dendritic structure was formed by two step electro-deposition. A copper foam was made by electro-plating utilizing hydrogen bubbles and nickel film on copper was made by pulse electro-plating due to its complex structure. Then MoS2 was formed on the dendritic structure by thermolysis or hydrothermal synthesis. The platform has abundant active sites due to its particular structure. The unique structure was examined by SEM, TEM. To confirm that MoS2 was reduced completely, XPS analysis was used. The layer of MoS2 is also important for HER, so the layer was characterized by Raman, XRD. Electrochemical experiment demonstrated that the electrode exhibited highly effective for HER activity with large cathodic current density and good stability. This work demonstrates that highly porous Cu/Ni/MoS2 structure, possessing huge surface, are desirable for HER and these findings would open up new opportunities for highly efficient electro-catalysts. |
