Synthesis of TiO2/LaFeO3 composites for the photoelectrochemical hydrogen evolution

Developing highly active catalysts for hydrogen evolution reaction is vital for large-scale and efficient production of hydrogen through water splitting. In this study, we reported scale-up TiO 2 /LaFeO 3 composite catalysts with multiple heterojunctions synthesized via facile solid-phase reaction and investigated their hydrogen evolution reaction (HER) performance in both acidic and alkaline solutions. To be excited, under AM1.5 simulated sunlight irradiation, the working electrode decorated by TiO 2 /LaFeO 3 presents a higher current density with 10 mV/cm 2 at 0.55 V in a 0.5 M H 2 SO 4 solution, suppressing the corresponding performance with the occasion of pure electrocatalysis. Importantly, the hydrogen evolution efficiency can reach 7.62 mmol h −1 cm −2 , overwhelming approximately 5.3 times higher than that of commercial P25 (1.43 mmol h −1 cm −2 ) with exceptional stability via imposing simulated sunlight and a bias of 500 mV. Therefore, such excellent catalysts could serve as an alternative to reach remarkable HER performance via fossil fuels free technology, potentially making contribution toward the goal of global “carbon neutral” by 2050.