Simple Synthesis of Perovskite oxides/FeOOH with N-Doped Graphene Quantum Dots to Boost Electron Transfer

Bifunctional electrocatalyst requires superior charge transfer and good electrochemical performance to produce overall and stable water splitting reaction. Perovskite oxides (ABO₃) have a good performance in oxygen evolution reaction but poor in hydrogen evolution reaction. Iron (oxy)hydroxides (FeOOH) show good electrochemical performance in hydrogen evolution reaction but have low conductivity. Herein, we successfully synthesized the LaSrCoO/N-GQD/FeOOH composites via impregnation method and high energy ball-milling, which exhibited an efficient OER and HER performance with a lower overpotential of 300mV and 420mV at 10mA cm^-2. Also, composites have a lower Tafel slope value of 51mV dec^-1 compared with simple LaSrCoO@FeOOH composites. In the overall electrochemical water splitting system, the LaSrCoO/N-GQD/FeOOH showed excellent stability at 1 A cm^-2 over 100 h in full cell voltage. These LaSrCoO/N-GQD/FeOOH composites will provide the development of designing other electrocatalysts and give new way in boosting electron transfer induced by intermediate electron bridge materials.