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Electrodeposited laser – nanostructured electrodes for increased hydrogen production

Poimenidis Ioannis, Papakosta Nikandra, Manousaki Alexandra, Klini Argyro, Farsari Maria, Moustaizis Stavros, Loukakos Panagiotis

Πλήρης Εγγραφή


URI: http://purl.tuc.gr/dl/dias/663E740A-2108-4EC3-9D9B-10183C4B725C
Έτος 2022
Τύπος Δημοσίευση σε Περιοδικό με Κριτές
Άδεια Χρήσης
Λεπτομέρειες
Βιβλιογραφική Αναφορά 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. https://doi.org/10.1016/j.ijhydene.2022.01.062
Εμφανίζεται στις Συλλογές

Περίληψη

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).

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