The shape-dependent performance of metal co-catalysts in photocatalysis has been one of the research focal points in recent years.In this study,PtPd/C3N4 hybrid structures were constructed to reveal the effect of the shape of the PtPd bimetallic co-catalyst on the performance of photocatalytic hydrogen generation.PtPd nanocubes (NCs)and nanotetrahedrons (NTs) were sequentially deposited in situ on the surface of C3N4 nanosheets,establishing a strong contact interface to ensure the smooth transfer of photoinduced electrons.Ultraviolet-visible (UV-Vis) dif-fuse reflectance spectroscopy and photoelectrochemical experiments revealed that the PtPd NCs/C3N4 photocatalyst had comparable light absorption ability and equivalent car-rier separation and transfer efficiency in comparison with the PtPd NTs/C3N4 photocatalyst,which excluded the influence of these factors on shape-dependent performance.The pho-tocatalytic hydrogen generation results indicate that the hydrogen generation rate of the PtPd NCs/C3N4 photocata-lyst is 1.33 times higher than that of the PtPd NTs/C3N4 photocatalyst,demonstrating that the cubic PtPd bimetallic co-catalyst is more conducive to hydrogen generation com-pared to the tetrahedral PtPd bimetallic co-catalyst.