Photo-bioelectrochemical fuel cell (PBFC) holds a great potential to harvest sustainable electrical energy from wastewater, but low power output limits its applications due to poor electrochemical performance of photo-biocathode. Additionally, antibiotics are ubiquitous in wastewater streams, but little is known regarding their effects on photo-biocathode performance of the PBFC. This study attempted to increase power output of PBFC through improvement of the photo-biocathode performance by modifying the biocathode with graphene oxide/cobalt/polypyrrole (GO/Co/PPy) composite in the presence of oxytetracycline. The GO/Co/PPy composite modified electrode fabricated by one-step electropolymerization method exhibited more excellent catalytic activity toward oxygen reduction compared to Co-alone and Co/PPy modified electrode. The PBFC with GO/Co/PPy composite modified biocathode produced a maximum power density of 19 mW/m², which was almost 4-fold higher than that produced with the bare biocathode (4.9 mW/m²) due to improved bio-electrocatalytic performance of the bicathode by the GO/Co/PPy composite. The maximum power density of the PBFC was further increased 4.6 (105.5 mW/m²), 3.7 (88.7 mW/m²), 2.9 (74.6 mW/m²) and 1.9 (56 mW/m²) fold by exposure to 5, 10, 20, and 50 mg/L OTC, respectively. The further increases in power was due to reduced cathode's charge transfer resistance using degradation products of OTC as mediators and OTC-stimulated growth of species with extracellular electron transfer ability. However, the photosynthesis and growth of alga was negatively affected by OTC concentration higher than 10 mg/L, resulting performance deterioration of bicathode.

光生物电化学燃料电池（PBFC）具有从废水中收集可持续电能的巨大潜力，但由于光生物阴极的电化学性能差，低功率输出限制了其应用。此外，废水中普遍存在抗生素，但对它们对PBFC的光生物阴极性能的影响知之甚少。这项研究试图通过在氧四环素存在下用氧化石墨烯/钴/聚吡咯（GO / Co / PPy）复合材料改性生物阴极来提高光生物阴极性能，从而增加PBFC的功率输出。与单独使用Co和Co / PPy修饰电极相比，通过一步电聚合法制备的GO / Co / PPy复合修饰电极表现出更优异的催化氧还原活性。²，由于使用GO / Co / PPy复合材料改善了二阴极的生物电催化性能，比裸露的生物阴极（4.9 mW / m ²）产生的几乎高出4倍。PBFC的最大功率密度进一步提高了4.6（105.5 mW / m ²），3.7（88.7 mW / m ²），2.9（74.6 mW / m ²）和1.9（56 mW / m ^2））分别暴露于5、10、20和50 mg / L的OTC中。功率的进一步增加是由于使用OTC的降解产物作为介体降低了阴极的电荷转移电阻，以及具有OTC刺激的具有细胞外电子转移能力的物质的生长。但是，高于10 mg / L的OTC浓度会对藻类的光合作用和生长产生不利影响，从而导致二阴极的性能下降。