Laser-nanostructured Ni-Fe electrodes for improved supercapacitor-electrolysers systemsLaser-nanostructured Ni-Fe electrodes for improved supercapacitor-electrolysers systems Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2025-07-242023enThere is an increasing interest in developing an Ni-Fe supercapacitor-electrolyser system (SCES) for electricity storage and efficient hydrogen production. In this study, periodic nanostructures on nickel [(λNi = 570 ± 30) nm] and on iron sheets [(λFe = 553 ± 6) nm] have been fabricated and were used as electrodes in an alkaline SCES. Their efficiency was compared to untreated nickel and iron sheets. The electrochemical evaluation of the nanostructured electrodes showed lower overpotential (η10 and η100) and lower Tafel slope for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The hydrogen production efficiency of the laser-nanostructured electrodes was significantly enhanced. Moreover, the laser-nanostructured electrodes' double-layer capacitance (CDL) values were increased 1.5 times for laser-nanostructured Fe electrodes and 5.3 times for laser-nanostructured Ni electrodes. These results show the potential of the fabricated electrodes in applications serving a dual purpose, i.e., enhanced hydrogen production and increased charge storage.PL, MF, AK, NP acknowledge financial support from the European Union's Horizon 2020 research and innovation program under grant agreement no 871124 Laserlab-Europe. The authors would like to acknowledge the HELLAS-CH national infrastructure (MIS 5002735) implemented under “Action for Strengthening Research and Innovation Infrastructures,” funded by the Operational Programme“ Competitiveness, Entrepreneurship and Innovation” (NSRF 2014-2020) and co-financed by Greece and the European Union (European Regional Development Fund).http://creativecommons.org/licenses/by/4.0/Materials Science and Engineering: B295 Poimenidis Ioannis Ποιμενιδης Ιωαννης Papakosta Nikandra Klini Argyro Farsari Maria Moustaizis Stavros Μουσταιζης Σταυρος Loukakos Panagiotis Elsevier Laser-nanostructuring Hydrogen production Energy storage