Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

Abstract

Additive manufacturing has been a very promising topic in recent years for research and development studies and industrial applications. Its electrochemical applications are very popular due to the cost-effective rapid production from the environmentally friendly method. In this study, three-dimensional (3D) printed electrodes are prepared by Ni and Co coatings in different molar ratios. Different Ni/Co molar ratios (x:y) of the Ni/Co/x:y alloys are prepared as 1:1, 1:4, and 4:1 and they are named Ni/Co/1:1, Ni/Co/4:1, and Ni/Co/1:4, respectively. According to the results, when the 3D electrode samples are coated with Ni and Co at different molar ratios, the kinetic performance of the NiCo-coated 3D electrode samples for hydrogen evolution reaction is enhanced compared to that of the uncoated 3D electrode sample. The results indicate that the Ni/Co/1:4-coated 3D electrode has the highest kinetic activity for hydrogen evolution reactions (HERs). The calculated Tafel′s slope and overpotential value (η10) for HER are determined as 164.65 mV/dec and 101.92 mV, respectively. Moreover, the Ni/Co/1:4-coated 3D electrode has an 81.2% higher current density than the other electrode. It is observed that the 3D printing of the electrochemical electrodes is very promising when they are coated with Ni–Co metals in different ratios. This study provides a new perspective on the use of 3D printed electrodes for high-performance water electrolysis.

Pt Thin Film-Coated 3D-Printed Polymer Anode Gas Diffusion Electrodes for PEM Water Electrolyzers

“…GDE with a square geometric pattern was designed with a void ratio of 25%, and this rate was determined by proportioning the total void ratio to the total solid ratio as a percentage . The procedures for preparing the 3D-printed square GDE geometries were prepared following a methodology very similar to our previous research work. , Electrode samples were produced by 3D printing with an Ultimaker +2 brand FDM printer. Both square GDE geometry samples were printed at a bed temperature of 220 °C, nozzle temperature of 60 °C, and an extrusion speed of 30 mm/s.…”

Metal Electrocatalysts for Hydrogen Production in Water Splitting

“…Selective production of oxygen and hydrogen is possible in this process, thus eliminating the gas separation step. , Also, the source used (H 2 O) and the products made (O 2 and H 2 ) are environmentally friendly. It is worth noting that despite the tremendous advantages, the HER has limitations due to its high electric power consumption and the use of optimized catalysts . However, renewable energy application systems, including the HER, depend highly on the appropriate electrocatalyst type. , State-of-the-art precious metals and their compounds are active materials for HER and oxygen evolution reactions (Pt for HER, IrO 2 and RuO 2 for OER, etc.)…”

“…It is worth noting that despite the tremendous advantages, the HER has limitations due to its high electric power consumption and the use of optimized catalysts. 12 However, renewable energy application systems, including the HER, depend highly on the appropriate electrocatalyst type. 11 , 13 State-of-the-art precious metals and their compounds are active materials for HER and oxygen evolution reactions (Pt for HER, IrO 2 and RuO 2 for OER, etc.).…”