Abstract
Metal ion doping is considered as an effective approach towards increasing the activity of transition metal selenide-based catalysts for electrocatalytic hydrogen evolution reaction (HER). Herein, we report a one-pot synthesis of Zn doped NiSe2 nanoparticles (ZnxNi1-xSe2, where x = 0.25, 0.50, 0.75) grown on nickel foam (NF) and the efficacy of ZnxNi1-xSe2/NF has been investigated towards electrocatalytic HER. The synthesized materials were systematically characterized and their electrocatalytic HER activity was tested in acidic and alkaline media, among which Zn0.25Ni0.75Se2/NF has demonstrated a relatively higher electrocatalytic performance. Zn0.25Ni0.75Se2/NF required very low overpotentials of 126 mV and 158 mV for HER to attain 10 mA cm−2 current density in 0.5 M H2SO4 and 1 M KOH, respectively. The inherent electrochemical properties such as electrochemical active surface area and double layer capacitance have been measured and Zn0.25Ni0.75Se2/NF has shown superior activity. Also, the binder-free Zn0.25Ni0.75Se2/NF electrocatalyst has illustrated excellent stability during continuous evolution of hydrogen for 12 h in acidic and alkaline medium.
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