Abstract
In this work, TiO2 nanosheets and NiCoSe2 nanoparticles were synthesized via a hydrothermal method respectively, then NiCoSe2 was combined with TiO2 using a solvent evaporation strategy to form heterojunction for efficient photocatalytic H2 evolution. The investigation demonstrates that the H2 evolution rate of 5 %-NiCoSe2/TiO2 can reach up to 4976 μmol·g−1·h−1 in the sacrificial agent of 20 vol% triethanolamine (TEOA) solution under a 300 W Xe lamp irradiation, which is approximately 35.5 times higher than that of TiO2 (140 μmol·g−1·h−1). Besides, the composite exhibits excellent stability after undergoing five consecutive cycles. The prominent H2 evolution activity of this system can be attributed to the abundant redox active sites provided by the bimetallic selenides, as well as the enhanced light harvesting ability and photocurrent response, reduced electrochemical impedance especially the improved electron-hole (e--h+) pairs separation due to the formed S-scheme charge transfer route between TiO2 and NiCoSe2.This work demonstrates the promising application potential of bimetallic selenides in photocatalytic H2 evolution.
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