Jiang Demin, Chen Huina, Xie Hao, Cheng Kai, Li Liang, Xie Kun, Wang Yuqiao
Research Center for Nano Photoelectrochemistry and Devices, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China; School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing, 404100, China.
Research Center for Nano Photoelectrochemistry and Devices, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.
Environ Res. 2023 Mar 15;221:115308. doi: 10.1016/j.envres.2023.115308. Epub 2023 Jan 14.
The heteroatoms and transition metal co-doped carbon-based catalysts are an important way to improve the catalytic activity of oxygen reduction reaction (ORR). Herein, we reported a facile method to obtain iron, nitrogen, and sulfur co-doped cellulose paper carbon fibers as catalysts (Fe-N-S/CFs) for ORR in microbial fuel cells (MFCs) with the adsorption recovery of Congo red molecules from dye wastewater. The thermal treatment promoted the etching of carbon surface by ferric ions, resulting in increased surface roughness for forming the defective carbon structure. The rich active species and defective carbon formed on the etched surface to enhance the electroactive surface area and effective sites. Fe-N-S/CFs catalysts achieved high half-wave potential due to the synergy effect between chemical components and defect structures. The assembled single-chamber air cathode MFC gained a high maximum power density of 1773 ± 40 mW m versus Pt/C MFC of 1325 ± 94 mW m. This work provides a strategy for recovering dye molecules from wastewater to prepare non-precious metal catalysts for enhancing ORR activity.
杂原子和过渡金属共掺杂的碳基催化剂是提高氧还原反应（ORR）催化活性的重要途径。在此，我们报道了一种简便的方法，通过从染料废水中吸附回收刚果红分子，获得铁、氮和硫共掺杂的纤维素纸碳纤维作为微生物燃料电池（MFC）中ORR的催化剂（Fe-N-S/CFs）。热处理促进了铁离子对碳表面的蚀刻，导致表面粗糙度增加，形成有缺陷的碳结构。蚀刻表面形成了丰富的活性物种和有缺陷的碳，从而增加了电活性表面积和有效位点。由于化学成分和缺陷结构之间的协同效应，Fe-N-S/CFs催化剂具有较高的半波电位。组装的单室空气阴极MFC获得了1773±40 mW m的高最大功率密度，而Pt/C MFC为1325±94 mW m。这项工作为从废水中回收染料分子以制备用于增强ORR活性的非贵金属催化剂提供了一种策略。
