Experimental investigation of newly designed 3D-printed electrodes for hydrogen evolution reaction in alkaline media
M. A. K. Khalil, İbrahim Dinçer
Abstract
This paper employs a novel approach for fabricating 3D-printed cathodes for hydrogen evolution reaction for alkaline water electrolysis. The approach investigated in this study involves using additive manufacturing to 3D print electrodes with non-conductive PLA followed by nickel conductive paint coating and electrodeposition of various catalysts. The nickel and nickel-copper, nickel-iron, and nickel-molybdenum alloys are electrodeposited. The nickel electrodes tend to have high overpotentials for 3D-printed electrodes. In this study, a low overpotential for the nickel coated electrode is reported. At a current density of 10 mA/cm2, for sample J with a nickel mass density of 0.178 g/cm2, an overpotential of 367 mV for hydrogen evolution reaction (HER) is measured in 1 mol potassium hydroxide (KOH) solution. The electrochemical activity of the electrodes is further enhanced through the incorporation of catalysts. Specifically, the electrode coated with nickel-molybdenum is found to have an overpotential of 337 mV at a current density of 10 mA/cm2 for HER in 1 mol KOH solution.