A Ru/Co3O4 catalyst with Ru–O–Co structure presented highly stable activity and selectivity in 1,2-DCB oxidation.

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Visible-light active Fe 2 O 3 -GQDs/NF-TiO 2 composite films were fabricated via 12 sequential electro-deposition and electro-oxidation processes. The prepared photocatalytic 13 films were extensively characterized using scanning electron microscopy (SEM), 14 high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), 15 Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results revealed that 16 graphene quantum dots (GQDs) and -Fe 2 O 3 particles were simultaneously deposited onto 17 the surface of N and F co-doped TiO 2 (NF-TiO 2 ) simply using a graphite sheet instead of a Pt 18 sheet as anode in the electro-deposition process. The NF-TiO 2 substrate obtained by calcining 19 TiO 2 nanotubes (TiO 2 -NTs) in the presence of NH 4 F displayed pyramid shapes with dominant 20 (101) facets. Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy 21 (EIS) and Mott-Schottky (M-S) plots indicated that the generation, separation and transfer of 22 photogenerated charges were greatly enhanced on the novel composite. The photocurrent 23 density of Fe 2 O 3 -GQDs/NF-TiO 2 was 4.2 times that on Fe 2 O 3 /TiO 2 -NTs at 0.5 V vs. Ag/AgCl 24 under visible light irradiation. For the photoelectrocatalytic (PEC) reduction of Cr(VI) using 25 Fe 2 O 3 -GQDs/NF-TiO 2 as photoanode with a Ti sheet as cathode, substantially enhanced 1 activity was achieved due to the combined effect of visible-light-active components (-Fe 2 O 3 2 and NF-TiO 2 ) and excellent electron mediator (GQDs). The calculated reduction rate constant 3 was 7 times that obtained on Fe 2 O 3 /TiO 2 -NTs film. Furthermore, both the long-time 4 photocurrent and cyclic PEC reduction of Cr(VI) indicated good stability of the composite 5 film. 6

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