Laser‐Ablation‐Produced Cobalt Nickel Phosphate with High‐Valence Nickel Ions as an Active Catalyst for the Oxygen Evolution Reaction

Abstract

Abstract Cost‐effective, highly efficient and stable non‐noble metal‐based catalysts for the oxygen evolution reaction (OER) are very crucial for energy storage and conversion. Here, an amorphous cobalt nickel phosphate (CoNiPO 4 ), containing a considerable amount of high‐valence Ni 3+ species as an efficient electrocatalyst for OER in alkaline solution, is reported. The catalyst was converted from Co‐doped Ni 2 P through pulsed laser ablation in liquid (PLAL) and exhibits a large specific surface area of 162.5 m 2 g −1 and a low overpotential of 238 mV at 10 mA cm −2 with a Tafel slope of 46 mV dec −1 , which is much lower than those of commercial RuO 2 and IrO 2 . This work demonstrates that PLAL is a powerful technology for generating amorphous CoNiPO 4 with high‐valence Ni 3+ , thus paving a new way towards highly effective OER catalysts.