NiS and Pt as dual co-catalysts for the enhanced photocatalytic H2 production activity of BaTiO3 nanofibers
A BaTiO3/Pt/NiS double heterojunction photocatalyst with Pt and NiS as co-catalysts was prepared using electrostatic spinning,hydrothermal,and photo-deposition methods.The optimized BaTiO3/Pt/NiS sample showed the highest hydrogen production rate of 489 μmol·h-1·g-1,which is 2.5 times higher than that of pure BaTiO3.Exper-imental results and density functional theory(DFT)calculations have demonstrated the construction of a p-n junc-tion between BaTiO3 and NiS,which efficiently facilitates the transfer of photogenerated holes from BaTiO3 to NiS.Additionally,the Schottky junction formed between BaTiO3 and Pt promotes the migration of photogenerated elec-trons from BaTiO3 to Pt.The opposite transfer routes of photogenerated electrons and holes naturally inhibit their recombination,resulting in a higher rate of hydrogen evolution.These results were further validated by photoelectro-chemical testing.The highest photocurrent density and smallest electrochemical impedance of the optimized BaTiO3/Pt/NiS sample convincingly proved its fastest separation of photogenerated electrons and holes,thus displaying the highest activity for hydrogen production.
BaTiO3/Pt/NiSnanofiberdual co-catalystphotocatalytic hydrogen production
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