Hollow Porous MnFe O Sphere Grown on Elm-Money-Derived Biochar towards Energy-Saving Full Water Electrolysis.

The development of inexpensive and efficient bifunctional electrocatalysts is significant for widespread practical applications of overall water splitting technology. Herein, a one-pot solvothermal method is used to prepare hollow porous MnFe O spheres, which are grown on natural-abundant elm-money-derived biochar material to construct MnFe O /BC composite. When the overpotential is 156 mV for both the oxygen evolution reaction and the hydrogen evolution reaction, the current density reaches up to 10 mA cm , and its duration is 10 h.