Hollow Porous MnFe<sub>2</sub>O<sub>4</sub> Sphere Grown on Elm‐Money‐Derived Biochar towards Energy‐Saving Full Water Electrolysis
Xia Liu, Yuqiu Huo, Li‐Kai Yan, Na Fan, Kui-zhe Cai, Zhong‐Min Su
Abstract
Abstract 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 2 O 4 spheres, which are grown on natural‐abundant elm‐money‐derived biochar material to construct MnFe 2 O 4 /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 −2 , and its duration is 10 h. At 1.51 V, the overall water decomposition current density of 10 mA cm −2 can be obtained in 1 m KOH. This work proves that elm‐money‐derived biochar is a valid substrate for growing hollow porous spheres. MnFe 2 O 4 /BC give a promising general strategy for preparing the effective and stable bifunctional catalysis that can be expand to multiple transition metal oxide.