P-021

Loreta Tamašauskaitė-Tamašiūnaitė

loreta.tamasiunaite@ftmc.lt

I. Stankevičienė, A. Jagminienė, A. Balčiūnaitė, J. Vaičiūnienė, E. Norkus

Center for Physical Sciences and Technology (FTMC), Lithuania

Transition metal-based catalysts for an efficient hydrogen production from water electrolysis

The efficient water splitting process requires highly efficient, durable, active, and corrosion-resistant electrocatalysts that facilitate both the hydrogen evolution (HER) at the cathode surface and the oxygen evolution (OER) at the anode surface, resulting in high rates of both reactions. In this study, catalysts combining transition metals (Co, Cr) were synthesized by the electroless metal plating using morpholine borane as a reducing agent. The surface morphology, structure, and composition of the prepared catalysts were studied in detail by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma optical emission spectroscopy (ICP-OES). The catalytic activity of the prepared catalysts was evaluated for energy conversion reactions such as the oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), and oxygen evolution reaction (OER) using cyclic voltammetry (CV), linear sweep voltammetry (LSV), chrono-techniques. It was found that the addition of a very small amount of Cr in the CoB coating significantly enhances its activity, especially for the HER. The lower overpotential value of 126.1 mV for the HER to obtain a current density of 10 mA cm–2 was obtained for CoCrB as compared to CoB (162.8 mV).

Acknowledgements:

This research was funded by a grant (No. P-MIP-24-653) from the Research Council of Lithuania (LMTLT).