FeNi₂S₄ : A Potent Bifunctional Efficient Electrocatalyst for the Overall Electrochemical Water Splitting in Alkaline Electrolyte

Title data

Hegazy, Mohamed Barakat Zakaria ; Zander, Judith ; Weiß, Morten ; Simon, Christopher ; Gerschel, Philipp ; Sanden, Sebastian A. ; Smialkowski, Mathias ; Tetzlaff, David ; Kull, Tobias ; Marschall, Roland ; Apfel, Ulf-Peter:
FeNi₂S₄ : A Potent Bifunctional Efficient Electrocatalyst for the Overall Electrochemical Water Splitting in Alkaline Electrolyte.
In: Small. Vol. 20 (2024) Issue 31 . - 2311627.
ISSN 1613-6829
DOI: https://doi.org/10.1002/smll.202311627

Project information

Abstract in another language

For a carbon-neutral society, the production of hydrogen as a clean fuel through water electrolysis is currently of great interest. Since water electrolysis is a laborious energetic reaction, it requires high energy to maintain efficient and sustainable production of hydrogen. Catalytic electrodes can reduce the required energy and minimize production costs. In this context, herein, a bifunctional electrocatalyst made from iron nickel sulfide (FeNi2S4 [FNS]) for the overall electrochemical water splitting is introduced. Compared to Fe2NiO4 (FNO), FNS shows a significantly improved performance toward both OER and HER in alkaline electrolytes. At the same time, the FNS electrode exhibits high activity toward the overall electrochemical water splitting, achieving a current density of 10 mA cm?2 at 1.63 V, which is favourable compared to previously published nonprecious electrocatalysts for overall water splitting. The long-term chronopotentiometry test reveals an activation followed by a subsequent stable overall cell potential at around 2.12 V for 20 h at 100 mA cm?2.