Photocatalytic hydrogen evolution can convert intermittent and dispersive solar energy into hydrogen with high energy density, which is expected to fundamentally solve the problems of environmental pollution and energy shortages. In this experiment, the performance of the catalyst is modified by introducing cocatalyst and morphology control. Ni(OH)₂ nanoflowers are used as substrates to derive nanoplate stack Ni₂P by high-temperature phosphating method, and a great many of CeO₂ nanoparticles are anchored in the Ni₂P. This unique 3D/0D combination effectively inhibits the agglomeration of CeO₂ nanoparticles and shortens the electron transfer path. Secondly, the introduction of metal-like performance of Ni₂P broadens the light absorption range of the catalyst and reduces the overpotential of the catalyst, which is a key factor in enhancing the catalytic activity. The design ideas of this experiment have reference significance for the design of efficient and environmentally friendly photocatalysts.