In situ synthesis of Fe-doped CrOOH nanosheets for efficient electrocatalytic water oxidation.

Oxygen evolution reaction (OER) is a sluggish kinetics process of electrochemical water splitting, which needs efficient non-noble-metal electrocatalysts. The study of CrOOH electrocatalysts for water oxidation is few reported due to its low performance. Herein, in situ synthesis of Fe-doped CrOOH nanosheets on Ni foam (Fe-CrOOH/NF) is designed as electrocatalysts and the OER performance is promoted obviously. The effect of Fe doping amount is also investigated. Experiments revealed that the best performance of Fe-CrOOH/NF demands low overpotentials of 259 mV to reach 20 mA cm-2 together with 0.245 s-1 of turnover frequency in 1.0 M KOH, which may point out a new direction for developing Fe doped OER electrocatalyst.