In situ development of amorphous Mn–Co–P shell on MnCo2O4 nanowire array for superior oxygen evolution electrocatalysis in alkaline media†
Exploitation of efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is of great importance. Herein, we report that the formation of an amorphous Mn–Co–P shell on MnCo2O4 can boost its OER activity in alkaline media. The core–shell Mn–Co–P@MnCo2O4 nanowire array on Ti mesh (Mn–Co–P@MnCo2O4/Ti) shows excellent electrochemical catalytic activity and requires an overpotential of 269 mV to drive 10 mA cm−2 in 1.0 M KOH, which is 93 mV less than that for the MnCo2O4 nanoarray. Notably, this catalyst also shows strong long-term electrochemical durability with its activity being maintained for at least 100 h and achieves a high turnover frequency of 1.06 s−1 at an overpotential of 450 mV.