Abstract
Enhancing the oxygen evolution reaction (OER) performance is essential for efficient hydrogen production from water using renewable electricity sources. In this study, we report the controlled synthesis of NiFe oxalate nanorods, facilitated by addition of potassium fluoride (KF) in the synthetic process. KF plays a crucial role, notably increasing the surface distribution of Fe (>80 at*) compared to syntheses conducted without KF. The optimal synthesis conditions, determined by OER activity, involved using 10 mM KF in an oxalic acid solution. This led to iron-rich NiFe oxalate-derived oxyhydroxides, which exhibited an overpotential of 226 mV at a current density of 10 mA cm-2. Operando Raman spectroscopy analysis was employed to probe the nature of active phases and reveal the origin of the improved OER activity.
Published Version
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