Preparation method and application of a visible light responsive photocatalytic electrode co-doped with au and c
A visible light and photocatalytic technology, applied in the field of photocatalytic materials, can solve the problem of wide band gap, achieve high photocurrent, good separation effect, and inhibit recombination.
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Embodiment 1
[0057] Embodiment 1 electrode preparation
[0058] (1) Au-C / NF-TiO 2 The photocatalytic electrode is prepared by the following steps:
[0059] (1) 1.0 g of NH after drying for 30 min 4 F is added with TiO 2 -The crucible of NTs electrode (2cm×2.5cm), put it into the muffle furnace and burn it at 450°C for 2h to prepare NF-TiO 2 electrode, the NF-TiO 2 Immerse the electrode in 50mL chloroauric acid solution (1g / L) for 10min, take it out and air dry it.
[0060] TiO 2 -Preparation of NTs: The Ti sheet (2cm×2.5cm) was polished with sandpaper until there was no trace on the surface, and then ultrasonically cleaned with acetone, absolute ethanol, and distilled water for 10 minutes. After taking it out and air-drying, with the Ti sheet as the anode and the Cu sheet as the cathode, in 0.5mol / L Na 2 SO 4 and 0.5% (wt) NaF mixed solution, apply a constant voltage of 20V, anodize for 5 hours, take it out, wash it, and air-dry it to get TiO 2 -NTs.
[0061] (2) Prepare 0.1mol / L...
Embodiment 2
[0070] The Au-C / NF-TiO prepared by embodiment 1 2 electrode placed in Na 2 SO 4 (0.1mol / L), Na 2 SO 3 (0.1mol / L) mixed solution, under the electrochemical workstation 3 electrode system, with Au-C / NF-TiO 2 The electrode is the working electrode, the platinum sheet is the counter electrode, the silver electrode is the reference electrode, and the xenon lamp is the light source. Under visible light, ultraviolet-visible light, and darkness alternately, the photocurrent density map of the photocatalytic electrode is obtained.
[0071] The above Au-C / NF-TiO 2 The electrode is replaced with the electrode prepared in Example 1: (two) Au-TiO 2 -NTs electrode; (3) Au-NF-TiO 2 Electrode; (4) C-NF-TiO 2 electrode, and other conditions remain unchanged, the photocurrent density diagrams of several photocatalytic electrodes are obtained.
[0072] Figure 1(a) and Figure 1(b) are the photocurrent density diagrams of the four electrodes under visible light and ultraviolet-visible ligh...
Embodiment 3
[0077] The Au-C / NF-TiO prepared by embodiment 1 2 electrode placed in Na 2 SO 4 (0.1mol / L), Na 2 SO 3 (0.1mol / L) mixed solution, under the electrochemical workstation 3 electrode system, with Au-C / NF-TiO 2 The electrode is the working electrode, the platinum sheet is the counter electrode, the silver electrode is the reference electrode, the setting technique is the i-t curve, and the internal voltage of the electrode is constantly changed to 0V, 0.1V, 0.3V, 0.5V, and the xenon lamp is the light source. (filtering out λ<420nm), the darkness alternates, and the time-current curves of photocatalytic electrodes under different built-in voltages are obtained in Figure 2(a).
[0078] It can be seen from Figure 2(a) that the magnitude of the photocurrent is different under different built-in voltages, which shows that the built-in voltage has a great influence on the magnitude of the photocurrent. Under visible light, as the built-in voltage increases, the photocurrent increase...
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