g-C3N4/Cu2O/CF电极制备及在微生物燃料电池中的应用

Preparation of g-C3N4/Cu2O/CF electrode and its application in microbial fuel cells

为了提高微生物燃料电池的产电性能,采用电沉积法将石墨态氮化碳(g-C3N4)与氧化亚铜(Cu2O)负载到碳毡(Carbon felt,CF)表面,制得g-C3N4/Cu2O/CF光电极用于构建微生物燃料电池.通过场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、光生电流曲线(I-T)、线性扫描伏安曲线(LSV)对光电阴极进行光电性能测试,并在白光发光二极管(LED)辐照下研究了以Cu2O/CF、g-C3N4/Cu2O/CF为阴极光催化微生物燃料电池的产电性能.结果表明,g-C3N4/Cu2O/CF电极中g-C3N4分布在Cu2O之间;g-C3N4/Cu2O/CF光电极能提高光利用率,与Cu2O/CF光电极相比,光电流密度达到2700 mA·m^-2,增长幅度达到125%;与Cu2O/CF阴极微生物燃料电池相比,g-C3N4/Cu2O/CF阴极微生物燃料电池具有更优的产电能力,在白光LED辐照下最大功率密度和光电流密度达到110.7 mW·m^-2和1102 mA·m^-2,增长幅度达到16%和27%.

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.