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(Cr,Mn,Fe,Ni,Zn) High-Entropy Oxides as Electrocatalysts for Green Hydrogen Production via Anion Exchange Membrane Water Electrolysis / Campagna Zignani, S., Fazio, M., Pascale, M., Alessandrello, C., Triolo, C., Musolino, M.G., Santangelo, S.. - In: NANOMATERIALS. - ISSN 2079-4991. - 16:16(2026). [10.3390/nano16161034]

(Cr,Mn,Fe,Ni,Zn) High-Entropy Oxides as Electrocatalysts for Green Hydrogen Production via Anion Exchange Membrane Water Electrolysis

Claudia Triolo;Maria Grazia Musolino
;Saveria Santangelo
2026-01-01
2026
20-ago-2026
Inglese
NANOMATERIALS
16
16
18
https://www.mdpi.com/4040606
Esperti anonimi
Sì
The development of sustainable and low-cost electrocatalysts based on Earth-abundant elements is essential for the large-scale deployment of green hydrogen production via anion exchange membrane water electrolysis (AEMWE). Herein, we demonstrate the feasibility of cobalt-free high-entropy oxide (HEO) electrodes for AEMWE through a set of spinel oxides based on equimolar Cr, Mn, Fe, Ni, and Zn. The HEOs were synthesized by a scalable sol-gel route followed by calcination at different temperatures (400–800 ◦C). The pristine oxides were employed as oxygen evolution reaction catalysts, whereas their H2/Arreduced counterparts were used as hydrogen evolution reaction catalysts in symmetric membrane electrode assemblies (MEAs). Comprehensive physicochemical characterization combined with electrochemical testing revealed that the phase purity of the anodic catalyst mainly correlates with both the maximum current density and the polarization resistance of the electrolyzer. In contrast, a correlation is observed between the physicochemical features of the reduced cathodic catalyst, the iR-free potential and the polarization resistance after prolonged operation. The best-performing Co-free MEA achieved a current density of 0.51 A cm−2 at 2.2 V and exhibited stable operation for hundreds of hours under alkaline electrolysis conditions. Although the complete replacement of cobalt results in lower activity than previously reported Co-containing HEOs, the present work establishes a viable design strategy for fully Co-free electrocatalysts and highlights the critical balance between catalytic performance, long-term stability, and material sustainability in future AEMWE technologies.
Internazionale
Campagna Zignani, Sabrina; Fazio, Marta; Pascale, Mariarosaria; Alessandrello, Chiara; Triolo, Claudia; Musolino, Maria Grazia; Santangelo, Saveria...espandi
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
(Cr,Mn,Fe,Ni,Zn) High-Entropy Oxides as Electrocatalysts for Green Hydrogen Production via Anion Exchange Membrane Water Electrolysis / Campagna Zignani, S., Fazio, M., Pascale, M., Alessandrello, C., Triolo, C., Musolino, M.G., Santangelo, S.. - In: NANOMATERIALS. - ISSN 2079-4991. - 16:16(2026). [10.3390/nano16161034]
7
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   High-Entropy Materials as cost-effective catalysts in anion exchange membrane water electrolysis for GREen hydrogEN production-HEM4GREEN
   HEM4GREEN
   MUR and the European Union–NextGenerationEU
1.1 Articolo in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12318/170447
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