Scale-up synthesis of amorphous Ni–Fe tungstate for highly-efficient oxygen evolution reaction

A microimpinging stream reactor is constructed for the scale-up synthesis of amorphous Ni–Fe tungstate as an OER electrocatalyst, which delivers a small overpotential of 235 mV at 10 mA cm −2 and good stability for 110 h operation at 290 mA cm −2 .