Ni (II), with an overpotential of 0.12503 eV, demonstrates reasonable catalytic efficiency for HER, though less optimal than cobalt. This value, while higher than cobalt's, indicates nickel's capability to facilitate HER under relatively mild conditions. Nickel is widely recognized as a practical catalyst due to its cost-effectiveness and availability, making it suitable for large-scale applications despite its moderate overpotential. Efforts to further reduce nickel's overpotential, possibly through alloying or ligand modification, could improve its competitiveness as an ideal HER catalyst.