Abstract
New types of photocatalytic systems formed by coupling annealed large-sized NiFe-LDH nanosheets with small-sized TiO2 nanosheets were used to facilitate the rapid separation of photo-generated electrons and holes. The photocatalytic hydrogen production for optimized photocatalytic systems can reach 209 mmol/g, which is 8 times of that for TiO2. To understand the photocatalytic mechanism, in-situ annealing transmission electron microscopy (TEM) investigation of the microstructural evolution of large-sized NiFe-LDH nanosheets identified typical microstructures at different annealing stages. The microstructure of the optimized system contains plentiful ultrafine grains distributed along surface delaminated defects, which can provide abundant active sites for photocatalytic hydrogen evolution. Electrochemical and spectroscopic techniques were further used to determine the Z-scheme mechanism, guiding photo-generated electrons to fast transfer onto large-sized NiFe-LDH nanosheets to achieve high efficient carrier separation.
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