Abstract:

The K⁺-doped g-C₃N₄(recorded as k-C₃N₄) and polypyrrole(PPy) were deposited on titanium foam(TF) via electrodeposition. Structural characterization using scanning electron microscopy(SEM), X-ray diffraction(XRD), and Fourier-transform infrared spectroscopy(FTIR) confirmed the formation of a three-dimensional porous network structure decorated with amino and hydroxyl functional groups, providing an ideal interface for Chlorella biofilm attachment. Electrochemical tests revealed that the growth of Chlorella biofilm on the photoanode could participate in electron transfer and formed a synergistic effect with the electron transfer pathway of the photocatalytic layer, significantly reducing the interfacial charge transfer resistance to 14 589 Ω, with a 30.5% decrease compared to bare TF. Microalgae-coupled photocatalytic fuel cell(mPFC) was constructed based on k-C₃N₄-PPy/TF, which achieved a maximum power density of 2 889 mW/m², representing a 56% improvement over the conventional photocatalytic fuel cell(PFC, 1 852 mW/m²). Additionally, the COD removal rate was increased to 73%. This demonstrates that the mPFC system not only exceled in pollutant degradation but also maintained robust power output capabilities, showing promising applications in the remediation of eutrophic water bodies and energy recovery.

Key words: electrodeposition, Chlorella, composite photoanode, photocatalysis, microalgae-microbial fuel cell

摘要：

采用电沉积法在泡沫钛（TF）基底上负载钾离子（K⁺）掺杂的g-C₃N₄（记作k-C₃N₄）与聚吡咯（PPy）构建k-C₃N₄-PPy/TF复合光阳极，通过扫描电镜（SEM）、X射线衍射仪（XRD）、傅里叶红外光谱仪（FTIR）表征证实所制备的k-C₃N₄-PPy/TF电极表面为具有氨基/羟基官能团修饰的三维多孔丝网状结构，这为小球藻生物膜的附着提供了理想界面。电化学性能测试表明，光阳极上生长的小球藻生物膜能够参与电子传递并与光催化层电子传递路径形成协同作用，将界面电荷转移电阻显著降低至14 589 Ω，较裸TF降低30.5%。基于k-C₃N₄-PPy/TF构建微藻耦合光催化燃料电池（mPFC），其最大功率密度达2 889 mW/m²，较传统光催化燃料电池（PFC，1 852 mW/m²）提升56%，且COD去除率提高至73%，可见该mPFC系统在实现污染物降解的同时具备良好的电能输出能力，在富营养化水体修复与能源回收领域展现出良好的应用前景。

关键词: 电沉积, 小球藻, 复合光阳极, 光催化, 微藻生物燃料电池

CLC Number: 

• TM911.45