Key Words:CATALYSTS

Abstract:A dual-chamber photocatalytic fuel cell (PFC) was constructed using commercial P25 TiO2 as the photoanode and a zeolitic imidazolate framework-67-polypyrrole (ZIF-67/PPy) composite as the cathode. The incorporation of ZIF-67 into PPy altered the cathodic oxygen reduction reaction from a 4-electron transfer route to a 2-electron pathway, with H2O2 as the primary product. Under irradiation, the ZIF-67/PPy composite outperformed both bare ZIF-67 and PPy cathodes, achieving the fastest degradation of polyvinyl alcohol (PVA) in both chambers and the highest photoelectrical conversion performance in the PFC. However, the absence of Fe3 ions in the cathode chamber significantly hindered the degradation rate. Radical quenching tests confirmed the production of OH center dot radicals during the cathodic reaction, highlighting the role of the Fenton-like reaction between Fe ions and H2O2 generated from oxygen reduction reactions, alongside other oxidative species such as O2 center dot and h from the photocatalytic reaction. In summary, the novel ZIF-67/PPy composite cathode demonstrated excellent performance in wastewater purification, photoelectrical conversion, and long-term stability, making it a promising candidate for practical PFC applications.

Volume:283

Issue:-

Translation or Not:no