Facile fabrication of hierarchical NiCoFeP hollow nanoprism for efficient oxygen evolution in Zn-air battery
Rational construction of chemical composition and morphology structure of electrocatalysts have been considered as the key to their electrochemical performance and energy storage. Herein, we report a facile fabrication of hierarchical Ni2P-Co2P-Fe2P hybrid hollow nanoprism (abbreviated as NiCoFeP-HN), which could efficiently work as the oxygen evolution reaction (OER) electrocatalysts in rechargeable Zn-air battery. NiCoFeP-HN was synthesized via in situ ion exchange reaction of nickel-cobalt precursors with [Fe(CN)6]3- at room temperature and followed the subsequent phosphorization treatment at 300 °C under N2. The ion exchange procedure was found to be crucial to preserve the nanoprism morphology and enhance OER performance. NiCoFeP-HN exhibited satisfactory activity with a small overpotential of 294 mV at 10 mA cm-2 and a remarkable stability for over 12 h. Comparing to the conventional RuO2 + Pt/C Zn-air battery, NiCoFeP-HN + Pt/C based Zn-air battery has exhibited superior energy density and much better cycling stability. This work provided a facile and efficient avenue for the construction of hollow nanostructure and hybrid composition, which endowed promising candidate for electrochemical performance and energy storage.