Abstract
A composite of Ag3PO4@g-C3N4 with the Z-scheme structure was synthesized, and used as the photoanode in a photocatalytic fuel cell (PFC). With the help of the Z-scheme design, both the degradation of tetracycline and the output of maximum power density (Pmax) were greatly enhanced in this PFC system. The degradation rate of tetracycline in the Ag3PO4@g-C3N4 PFC was 2.53 times and 3.65 times that in the PFC systems with the Ag3PO4 photoanode and the g-C3N4 photoanode, respectively. The Pmax of the Ag3PO4@g-C3N4 PFC was 6.06 μW cm−2, which was 1.46 times and 90.4 times that of the Ag3PO4 PFC (4.16 μW cm−2) and the g-C3N4 PFC (0.067 μW cm−2), respectively. The possible mechanism was proposed. The Z-scheme photoanode could not only contribute to the separation of photogenerated carriers to achieve a high photocatalytic activity, but also reserve a good redox capacity. Additionally, aeration played an important role on the PFC performance. It was demonstrated that N2 purging facilitated the electricity generation, while O2 purging promoted the pollutant degradation.
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