A highly-active, metal-free, carbon-based oxygen reduction reaction (ORR) cathode, i.e., graphitized N-doped carbon felt (GNCF), was prepared, for the first time, by in-situ modifying the doping species of polyacrylonitrile (PAN)-based carbon felt (CF) via a facile annealing process in Ar atmosphere. It was applied for dramatically enhanced organics degradation and electricity generation in a photocatalytic fuel cell (PFC) system. The GNCF showed enhanced specific surface area, improved graphitization and raised ratio of graphitic N, therefore resulting in excellently improved ORR performance compared to the CF. When applying the GNCF as a cathode in a PFC system, the proposed PFC showed significant improvement in degrading various model organic contaminants and outputing electricity simultaneously when compared with the PFC with CF. For instance, the apparent rate constant and electricity output efficiency showed ∼10.6 times and ∼7.2 times, respectively, improvement when using rhodamine B as model waste. Further improved performance was also achieved by aeration of air or O₂ due to the further enhanced ORR. The proposed PFC was also efficient in a wide pH, and kept outstanding stability in long-term utilization.

通过原位改性聚丙烯腈的掺杂种类，首次制备了高活性、无金属、碳基氧还原反应（ORR）阴极，即石墨化氮掺杂碳毡（GNCF） (PAN) 基碳毡 (CF)通过在 Ar 气氛中进行简单的退火过程。它用于显着增强光催化燃料电池 (PFC) 系统中的有机物降解和发电。GNCF 表现出增强的比表面积、改善的石墨化和提高的石墨 N 比率，因此与 CF 相比，ORR 性能得到了显着改善。当在 PFC 系统中应用 GNCF 作为阴极时，与具有 CF 的 PFC 相比，所提出的 PFC 在降解各种模型有机污染物和同时输出电力方面表现出显着改善。例如，当使用罗丹明 B 作为模型废物时，表观速率常数和电力输出效率分别提高了 10.6 倍和 7.2 倍。通过空气或氧气的曝气也实现了进一步改进的性能₂由于进一步增强的 ORR。所提出的 PFC 在较宽的 pH 值范围内也很有效，并在长期使用中保持出色的稳定性。