Abstract
BackgroundCdSe has emerged as a promising candidate for photocatalytic hydrogen evolution (PHE). To improve its photocatalytic activity, a novel CoAl-LDH/CdSe (CLCSe) heterojunction photocatalyst was designed. MethodsThe CoAl-LDH/CdSe heterojunction photocatalyst was successfully prepared by a facile hydrothermal method. X-ray photoelectron spectra (XPS) proved that CoAl-LDH was combined with CdSe through Cd-O bonds. Scanning electron microscope (SEM) and transmission electron microscope (TEM) collectively uncovered that CoAl-LDH was like sheet structures and CdSe presented irregular cluster particles. Photoluminescence (PL) spectroscopy and electrochemical experiments confirmed that CoAl-LDH/CdSe heterojunction effectively elevated the separation efficiency of charge carriers. Significant FindingsThe electron transfer path of CoAl-LDH/CdSe composites followed the S scheme mechanism. Moreover, the introduction of CoAl-LDH reduced the surface overpotential of CoAl-LDH/CdSe composites. The H2 generation rate of the optimal sample achieved 602 μmol g−1h−1, which was about 12 times that of pure CdSe. Its superior photocatalytic performance could be attributed to the promoted charge separation and decreased overpotential. This work furnishes an innovative assumption for modification of CdSe-based photocatalyst to obtain excellent hydrogen evolution activity.
Published Version
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