Simply Coupling TiO2 Nanospheres with Cu2O Particles to Boost the Photocatalytic Hydrogen Evolution through p–n Heterojunction-Induced Charge Transfer

Developing an efficient photocatalyst for solar-to-hydrogen production is regarded as a promising approach to tackle the energy and environmental challenges that we are currently facing. Herein, the TiO 2 –Cu 2 O nanocomposite is synthesized via a chemical reduction approach at ambient temperature and used as a photocatalyst. The composition and structure characterizations indicate that Cu 2 O particles are loaded on the surface of TiO 2 nanospheres. The photocatalytic performance of the as-obtained materials is evaluated by a solar-to-hydrogen production test. It is found that the optimized TiO 2 –Cu 2 O nanocomposite (TC-20) exhibits a hydrogen evolution rate of 7139.02 μmol g −1 h −1 , which is nearly 7 times that of pristine TiO 2 . Based on the photoluminescence spectra and photo/electrochemical measurements, the boosted photocatalytic H 2 evolution performance comes from the promoted separation efficiency of photoinduced electron–hole pairs, which originates from the formed p–n heterojunction of the TiO 2 –Cu 2 O nanocomposite.