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Article Dans Une Revue ACS Applied Engineering Materials Année : 2023

Efficient and Highly Stable 3D Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER

Résumé

Considered like a fully renewable and clean energy carrier with the highest energy density, dihydrogen (H2) constitutes the best alternative to fossil fuels for insuring the sustainability of energy. This technologically and industrially relevant energy vector can be produced by water electrolysis that is now widely recognized as an eco-friendly, scalable and carbon-free route. In that context, alkaline water electrolysis is an affordable technology because it allows the use of transition metals as electrocatalysts for both hydrogen (HER) and oxygen (OER) evolution reactions. Here, combining catalytically active transition metal alloys (NiFe and NiCo) with a 3D printing technique, namely selective laser melting (SLM), enables access to ca. 25 cm 2 microstructured cylindrical electrodes efficiently promoting alkaline HER and OER. NiCo is found to be the most efficient electrode for HER, with an overpotential of 210 mV at 10 mA cm-2. It is also the most stable electrode when studied in operation during prolonged electrolysis with a potential change of only 40 mV after 140 h electrolysis at 50 mA cm-2 (1.25 A). Regarding OER, NiFe shows the highest catalytic activity with an overpotential of 300 mV at 10 mA cm-2 and the greatest stability in operation with an electrolysis-induced potential change of only 30 mV. Further surface characterization techniques (scanning electron microscopy SEM, energy dispersive X-ray spectroscopy EDS, contact angle measurements, and analysis of electrogenerated gas bubbles) are used to monitor the electrolysis-induced chemical changes and to get valuable information on the bubble dynamics. Interestingly, electrolysis is found to be beneficial for enhancing the hydrophilicity/aerophobicity of the electrodes and thus facilitating the detachment of the H2 or O2 bubbles.
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Dates et versions

hal-04298057 , version 1 (25-10-2023)
hal-04298057 , version 2 (21-11-2023)

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Jeoffrey Tourneur, Loïc Joanny, Loïc Perrin, Stéphane Paul, Bruno Fabre. Efficient and Highly Stable 3D Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER. ACS Applied Engineering Materials, 2023, 1 (10), pp.2676-2684. ⟨10.1021/acsaenm.3c00417⟩. ⟨hal-04298057v2⟩
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