Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 322, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.122101
Keywords
Deep eutectic solvent; NiFe-based electrocatalysts; Multi -vacancies; Electrodeposition; AEM water electrolysis
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In this study, an optimized-electrodeposition set-up in a deep eutectic solvent was proposed for the electrochemical preparation of NiFe-based catalysts. The results showed that the synthesized NiFe-based catalysts exhibited outstanding water splitting performance in industrial conditions, and a simulated industrial device loaded with these catalysts worked efficiently.
Water electrolysis is a promising technique for green hydrogen production to achieve the global strategic goal of carbon neutrality. Herein, we propose an optimized-electrodeposition set-up in Ethaline-based deep eutectic solvent (DES) for the electrochemical preparation of NiFe-based catalysts. The developed synthesis procedure involves the anodic dissolution of Fe plates to provide Fe sources, which are gradually incorporated into the in -situ grown Ni films to fabricate NiFe-based electrodes. Our findings show that introducing nitrate ions coupled with electrochemical water oxidation can induce the formation of multi-vacancy-rich NiFe-based catalysts with outstanding water splitting performance in quasi-industrial conditions. A simulated industrial anion exchange membrane (AEM)-based device loaded with our NiFe-based electrocatalysts requires only 1.73 Vcell to reach 1000 mA cm-2 in 5.0 M KOH at 60 degrees C and works continuously for up to 200 h. The present work provides a means for the scalable synthesis of self-supported NiFe-based catalysts for industrial water splitting.
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