In this present study we have developed method for the synthesis of MoSe nanosheets following a simple hydrothermal technique. Palladium (Pd) and rhodium (Rh) nanoparticles were decorated on the surface of MoSe following a simple wet-chemical route. Pd and Rh nanoparticles decorated MoSe were applied for hydrogen evolution reaction (HER) in different pH conditions like acidic (0.5 M HSO), neutral (pH-7 buffer) and in alkaline (1 M KOH) medium and 3.5 wt% of saline water. Pd and Rh decorated MoSe show efficient activity towards HER irrespective of the applied electrolyte. In 0.5 M HSO, MoSe can produce 10 mA/cm current density with applied potential of -0.256 V vs. RHE. Rh decorated MoSe shows more shift in the onset potential. Upon applied potential of -0.192 V vs. RHE, MoSe/Rh can produce 10 mA/cm current density. MoSe/Rh is electrocatalytically more active than MoSe/Pd which is established from the calculated electrochemically active surface area (ECSA) value. Significantly lower (47 mV/decade) Tafel value is observed for MoSe/Rh in 0.5 M HSO which indicates the superior activity. MoSe/Rh is more stable in neutral and alkaline medium compared to acidic medium and it can retain its own activity even after continuous 12 h reaction.
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