g-C₃N₄/Cu₂O/CF电极制备及在微生物燃料电池中的应用

To improve the electricity generation capabilities of microbial fuel cells (MFC), graphite carbonitride (g-C₃N₄) and cuprous oxide (Cu₂O) were electrodeposited onto the surface of carbon felt (CF) to fabricate a g-C₃N₄/Cu₂O/CF photocathode. The photoelectric performance of the photocathode was tested by using field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), photogenerated current curve (IT), and linear sweep voltammetry (LSV). The results indicate that g-C₃N₄ is distributed between Cu₂O in g-C₃N₄/Cu₂O/CF electrode; the photogenerated current density of g-C₃N₄/Cu₂O/CF cathode was 2700 mA•m^-2, which was 125% higher than that of Cu₂O/CF cathode. g-C₃N₄/Cu₂O/CF photocathode was used to construct a microbial fuel cell. The energy density of the photocatalytic microbial fuel cells (PMFC) with Cu₂O/CF and g-C₃N₄/Cu₂O/CF cathodes were tested under the irradiation of white LED. Compared with the PMFC with Cu₂O/CF cathode, the PMFC with g-C₃N₄/Cu₂O/CF cathode has better power generating performance. When the g-C₃N₄/Cu₂O/CF cathode was used in MFC, maximum power density and photocurrent density of MFC under white LEDs irradiation were up to 110.7 mW•m^-2 and 1102 mA•m^-2, 16% and 27% higher than the PMFC with Cu₂O/CF cathode.