Abstract:
For electrochemical water splitting, the fabrication and designing of an active, durable, and stable bifunctional catalyst is the most challenging issue. In this work we reported a bifunctional heterostructure hybrid of ZIF-67 coated by Mo2C with optimized ratio (1:2). This bifunctional electrocatalyst have shown an outstanding activity for water splitting. MCZ -2 synthesized by annealing at high temperature which resulted in high activity both for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) processes. The hybrid with ratio of (1:2) have shown superior catalytic activity. The prepared catalyst has shown a low overpotential of 169 mV and 208 mV at the current density of 10 mA/cm2 and 20 mA/cm2 for HER. For OER, it possesses a very low overpotential of 340 mV and 370 mV at the current density of 20 mA/cm2 and 50 mA/cm2. Besides, this the MCZ - 2 have shown a long-term stability 24 h at the current density of 100 μA/cm2. The boosted HER and OER activity of the hybrid is attributed with synergetic effect between ZIF 67 and Mo2C and modulation of active sites due to the presence of N in the hybrid.
