【摘要】 使用空气阴极的微生物燃料电池(MFC)能够在回收转化污水产生电能的同时直接利用空气中的氧气从而具有较大的应用前景。因此,阴极良好的氧还原(ORR)反应能力对MFC产电性能起到至关重要的作用。目前铂是公认的ORR性能最好的催化剂,但其价格昂贵,且易受微生物代谢毒化,不适合应用在MFC中。越来越多的研究集中在有良好的催化活性和稳定性的碳质ORR催化剂上。本文利用蛋白核小球藻作为ORR催化剂前驱体提供氮源和碳源,同时通过高温碳化引入铁元素掺杂制备出Fe-N-C ORR催化剂,研究对比了掺杂剂铁元素的价态对催化剂ORR性能的影响。实验得出三价铁直接碳化作为铁源的ORR催化剂获得了丰富的介孔结构,表现出更好的催化活性,在MFC中获得了更高的产电性能。更多还原

【Abstract】 Microbial fuel cells(MFCs) can degrade organic matter in wastewater and generate electric power simultaneously.The air cathode MFCs is one of the most promising configurations due to the free availability of oxygen in air and the decreased operational costs.Therefore,oxygen reduction reaction(ORR) performance of the air-cathode plays a crucial role in MFC applications.At present,platinum is recognized as the common ORR catalyst,but it is not suitable for MFCs due to its high cost and poisoning by microbial metabolites.In this work,Chlorella pyrenoidosa was used as the precursor for the ORR catalyst to provide nitrogen and carbon source during high-temperature carbonization.After doping with iron,the ORR catalyst showed a better catalytic activity and higher performance in MFC compared with Pt/C because of the facilitated oxygen supply resulting from the rich mesoporous structure.In addition,this study also investigated the influence of valences of doped iron on the performance of the ORR catalysts.更多还原