Photocatalytic Hydrogen Production Performance of TiO2/(Ti0.25Mn0.25Co0.25Ni0.25Zn0.25)3O4 Nanocomposites
The study aims to solve the problems that TiO2 nanomaterials are high in hole complexation rate and poor in photostability.The solution combustion method was used for the successful preparation of(Ti0.25 Mn0.25 Co0.25 Ni0.25 Zn0.25)3 O4 high-entropy oxide nanoparticles for the first time.And then solid-phase reaction method was used to prepare TiO2/(Ti0.25Mn0.25Co0.25Ni0.25Zn0.25)3O4 nanocomposite,which was used in the photocatalytic hydrogen production.The results show that when the molar ratio of TiO2 to(Ti0.25Mn0.25CO0.25Ni0.25Zn0.25)3 O4 is 30,its rate of photocatalytic hydrogen production reaches a maximum of 1 304.5 μmol·h-1·g-1,which is 85.3 and 1.98 times higher than the rates of(Ti0.25Mn0.25 Co0.25Ni0.25 Zn0.25)3O4)3O4 nanomaterial and TiO2 nanoparticles,respectively.The higher photocatalytic hydrogen production rate is attributed to the formation of a heterojunction between(Ti0.25Mn0.25Co0.25 Ni0.25Zn0.25)3O4 and TiO2,which makes the composite have a higher photogenerated carrier separation rate,enhancing its photocatalytic hydrogen production performance.The photostability test shows that after 12 h of light irradiation,the hydrogen production rate of the nanocomposite decreases by only 11％,while that of TiO2 nanoparticles decreases by as high as 81.7％,indicating that the nanocomposite has higher photostability than TiO2 does.
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