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TiO2-Graphene 3D Hydrogel Supported on Ni Foam for Photoelectrocatalysis Removal of Organic Contaminants

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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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Keywords: 3D Network Structure; Nickel Foam; Photoelectrocatalysis; TiO2-Graphene Hydrogel

Document Type: Research Article

Affiliations: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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