Abstract
Three-dimensional porous materials, especially graphene hydrogel, have been widely used as promising supports for catalysts. In this study, Ni Foam-TiO₂-graphene hydrogel composite (NFTGH) with three-dimensional porous structure was successfully fabricated. NF-TGH exhibited remarkable photoelectrocatalysis (PEC) performance for the degradation of methyl orange (MO). Due to its cross-porous network structure, NF-TGH can immobilize additional TiO₂ nanoparticles and expose more catalytic sites than thin film materials. Meanwhile, the inherent conductivity of graphene can greatly raise the charge-transfer rate of 3D network catalyst as compared to the poor performance of the thin film semiconductor catalyst. The MO degradation rate increased by more than 30% after a 1.5 V bias voltage was applied. This promoted activity demonstrates that bias voltage will greatly enhance the electron-hole separation. In addition, NF-TGH electrode can potentially be utilized in water purification due to its high degradation activity, stable porous structure and easy separation from waste water.
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