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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/663E740A-2108-4EC3-9D9B-10183C4B725C | - |
| Identifier | https://doi.org/10.1016/j.ijhydene.2022.01.062 | - |
| Identifier | https://www.sciencedirect.com/science/article/pii/S0360319922001227 | - |
| Language | en | - |
| Extent | 10 pages | en |
| Title | Electrodeposited laser – nanostructured electrodes for increased hydrogen production | en |
| Creator | Poimenidis Ioannis | en |
| Creator | Ποιμενιδης Ιωαννης | el |
| Creator | Papakosta Nikandra | en |
| Creator | Manousaki Alexandra | en |
| Creator | Klini Argyro | en |
| Creator | Farsari Maria | en |
| Creator | Moustaizis Stavros | en |
| Creator | Μουσταιζης Σταυρος | el |
| Creator | Loukakos Panagiotis | en |
| Publisher | Elsevier | en |
| Description | 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). | en |
| Content Summary | In the present work, a novel approach has been employed to effectively enlarge the electrocatalytic area of the electrodes in an alkaline electrolysis setup. This approach consists of a two-step electrode fabrication process: In the first step, ultrashort laser pulses have been used to nanostructure the electrode surface. In the second step, electrodeposition of nickel particles was performed in a modified Watt's bath. The resulting electrodes have been found to exhibit a significantly increased hydrogen evolution reaction (HER) activity. Compared to the laser-nanostructured electrode (LN) and an untreated (i.e., flat) electrode, the electrodeposited-laser-nanostructured (ELN) electrode provides (i) enhanced electrochemical values (ii) a significant increase of double-layer capacitance (CDL) (values up to 1945 μF cm−2) compared to that of an LN electrode (288 μF cm−2) (iii) higher Jpeaks at CVs sweeps and (iv) lower Tafel slopes (−121 mV dec−1 compared to −157 mv dec−1). The ELN electrode provides an overpotential value of |η|100 = 264 mV, which shows a noteworthy 34% decrease compared to a flat Ni electrode and a 15% decrease to an (LN) electrode. Scanning electron microscopy (SEM) revealed that the electrodeposition of nickel on the LN nickel electrodes results in a dendrite-like morphology of the surface. Thus, the enhancement of the HER has been attributed to the dendrite-like geometry and the concomitant enlargement of the electrocatalytic area of the electrode, which presents an electrochemical active surface area (ECSA) = 97 cm−2 compared to 2.8 cm−2 of the flat electrode. The electrodes have also been tested in actual hydrogen production condition, and it was found that the ELN electrode produces 4.5 times more hydrogen gas than a flat Ni electrode and 20% more hydrogen gas than an LN electrode (i.e. without the extra nickel electrodeposition). | el |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2024-01-05 | - |
| Date of Publication | 2022 | - |
| Subject | Alkaline electrolysis | en |
| Subject | Electrodeposition on Ni | en |
| Subject | Ultrafast laser nanostructuring | en |
| Subject | Hydrogen production | en |
| Bibliographic Citation | I. A. Poimenidis, N. Papakosta, A. Manousaki, A. Klini, M. Farsari, S. D. Moustaizis, and P. A. Loukakos, “Electrodeposited laser – nanostructured electrodes for increased hydrogen production,” Int. J. Hydrogen Energy, vol. 47, no. 16, pp. 9527-9536, Feb. 2022, doi: 10.1016/j.ijhydene.2022.01.062. | en |
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