An Efficient and Earth-Abundant Oxygen-Evolving Electrocatalyst Based on Amorphous Metal Borides

Cost-effective and efficient oxygen-evolving electrocatalysts are urgently required for energy storage and conversion technologies. In this work, an amorphous trimetallic boride nanocatalyst (Fe-Co-2.3Ni-B) prepared by a simple approach is reported as a highly efficient oxygen evolution reaction electrocatalyst. It exhibits an overpotential () of 274 mV to deliver a geometric current density (j(geo)) of 10 mA cm(-2), a small Tafel slope of 38 mV dec(-1), and excellent long-term durability at a mass loading of 0.3 mg cm(-2). The impressive electrocatalytic performance originates from the unique amorphous multimetal-metalloid complex nanostructure. From application's point of view, this work holds great promise as this process is simple and allows for large-scale production of cheap, yet efficient, material.