Microbial fuel cells (MFCs) offer a promising and sustainable approach to wastewater treatment by harnessing the natural abilities of microorganisms to degrade organic pollutants and simultaneously generating electrical energy. However, the effectiveness of power generation in MFCs is heavily influenced by the choice of cathode catalyst. The use of platinum (Pt), the preferred catalyst material, is limited in large-scale applications due to its high cost. In this present study, polypyrrole/titanium oxide (Ppy/TiO₂) was synthesized and investigated as cathode catalysts in bioelectrochemical cells. Field emission scanning electron microscopy (FE-SEM) confirms the rectangular structure of TiO₂ covered by Ppy material in Ppy/TiO₂ composite. X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) also reveal the distinct characteristics and purity of Ppy/TiO₂ composite materials. The performance of the Ppy/TiO₂ (1:1) ratio shows better catalytic activity and electrical conductivity (R_total = 19.418 Ω) in comparison with other ratios (1:0, 1:1, 3:1, 1:2, 1:3, and 0:1). The Ppy/TiO₂ catalyst reaches a maximum power density of 0.630 W m⁻², comparable to platinum catalyst (0.853 W m⁻²). In addition, the voltage stability analysis for the Ppy/TiO₂ catalyst over five cycles yields a stable voltage of 0.675 ± 0.005 V at 100 Ω. This study highlights the performance comparison of Ppy/TiO₂ catalysts and their potential as cost-effective alternatives to expensive Pt/C cathode catalysts in sediment microbial fuel cells (SCMFCs), with significant implications for wastewater treatment.

微生物燃料电池（MFC）利用微生物降解有机污染物的自然能力并同时产生电能，为废水处理提供了一种有前途且可持续的方法。然而，MFC 的发电效率很大程度上受到阴极催化剂的选择的影响。铂（Pt）是优选的催化剂材料，但由于成本高，其大规模应用受到限制。在本研究中，合成并研究了聚吡咯/氧化钛（Ppy/TiO _{2 ）作为生物电化学电池中的阴极催化剂。场发射扫描电子显微镜(FE-SEM)证实了Ppy/TiO 2}复合材料中被Ppy材料覆盖的TiO ₂的矩形结构。 X射线衍射(XRD)、能量色散X射线光谱(EDS)和X射线光电子能谱(XPS)也揭示了Ppy/TiO ₂复合材料的独特特征和纯度。 与其他比例（1:0、1:1、3 _: 1、1 : 2 _、 1:3 和 0:1）。 Ppy/TiO _{2催化剂达到0.630 W m} ^-2的最大功率密度，与铂催化剂（0.853 W m ^-2）相当。此外，对 Ppy/TiO ₂催化剂五个循环的电压稳定性分析得出在 100 Ω 时稳定电压为 0.675 ± 0.005 V。本研究重点介绍了 Ppy/TiO ₂催化剂的性能比较及其作为沉积物微生物燃料电池 (SCMFC) 中昂贵的 Pt/C 阴极催化剂的经济高效替代品的潜力，对废水处理具有重大影响。