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| Abstract |
We report a simple strategy for providing a homogenous TiO_2 nanofibre host environment to stabilize Cu2_O nanoparticles with an average size of ∼60 nm and high dispersibility. We found that the small... fraction of Cu2_O nanoparticles in direct contact/partially submerged with TiO_2 nanofibre arrays (diameter ∼300 nm and length ∼650 nm) showed excellent synergistic photocatalytic performance for H_2 production rate of 48 μmol g^<−1> h^<−1> with an apparent quantum efficiency of 3.6 %. The H_2 production rate was much higher (factor of ∼6.5 times) compared with unmodified TiO_2-NF. In addition, the synergistic Cu2_O/TiO_2-NF photocatalyst showed significant oxidative-degradation of sulfamethoxazole (7 × 10^<-2> mmol g^<−1> min^<−1>) and was highly stable during five cycles. The small fraction of Cu2_O nanoparticles are well dispersed and form heterojunction interfaces to promote charge transfer and provide active sites. This argument is verified by morphology characterisation, band alignment, energy-resolved distribution of electron traps, electrochemical transient photocurrent, and electrochemical impedance (EIS). In addition, a detailed discussion is provided regarding the surface and bulk elemental composition determined by X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), and X-ray absorption near edge structure (XANES).show more
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