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Synthesis and application of three-dimensional TiO2 hierarchical architectures is one of the major priorities in the research and development of TiO2 catalysts. Using bacteria as template and reactor, a bioinspired strategy was developed in the present study to synthesize nanosheets-assembled TiO2 hierarchical architectures (N-TiO2-HA) and relative composites for photocatalytic and electrocatalytic application. In the ﬁrst part of this work, three kinds of bacteria were used for synthesis of N-TiO2-HA with satisfactory mono-dispersity, and the growth mechanism was investigated. In the second part, the porous TiO2 hollow spheres (P-TiO2-HS), which were obtained by calcining N-TiO2-HA at 750℃ in air, were incorporated with MIL-101(Fe) to improve the visible-light photocatalytic efficiency. The results of photo-Fenton assisted degradation of rhodamine B and ciprofloxacin indicate that the synthesized composites have excellent visible-light photocatalytic activity. In the third part, the nanosheets-assembled TiO2-carbon hollow spheres (N-TiO2-C-HS), which were obtained by calcining N-TiO2-HA at 750℃ in argon atmosphere, were electrodeposited with Pt for electrocatalytic oxidation of methanol. The electrochemical measurements show that Pt-deposited N-TiO2-C-HS have better electrocatalytic activity, stability, and tolerance to CO poisoning than commercial Pt/C catalysts.
This article was published in the following journal.
Name: ACS applied materials & interfaces
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