An efficient nickel oxides/nickel structure for water oxidation: a new strategy†
Abstract
A very simple method to synthesize an efficient and stable Ni-based water-oxidizing electrode was reported from the reaction of metallic nickel foam and Oxone (2K2SO5·K2SO4·KHSO4). The Ni-based electrode at pH = 13 yields current densities of at least 4.5 mA cm−2 at an overpotential of 450 mV, which is promising for use as an anode in water splitting systems. After 10 h, not only did the electrode not show a decrease in water oxidation, but an increase in water oxidation was also observed (∼6.0 mA cm−2). At a higher overpotential (837 mV), a current density of 24.3 mA cm−2 was observed, which was approximately 5 times larger than that of pure Ni foam in a similar condition.