摘要
研究了磷酸活化对石墨电极上氧还原反应的影响,并考察了磷酸活化石墨材料应用于微生物燃料电池阴极的可行性。首先以循环伏安和电化学阻抗谱等电化学方法考察了经磷酸活化的石墨材料的氧还原能力,发现经质量分数为85%磷酸活化12 h后其氧还原能力最强;然后将活化石墨材料应用于微生物燃料电池的阴极,进行极化曲线和功率密度曲线的测定。结果表明,磷酸活化阴极微生物燃料电池的最大功率密度可达7.92 W/m3,为未活化石墨阴极微生物燃料电池的3.4倍;同时进行了电化学比表面积的测定及FTIR的分析测定,结果表明,磷酸活化石墨颗粒的比表面积(7.716m2/g)较未活化颗粒(10.940 m2/g)略有减小,但其表面官能团的数量和种类发生了很大变化。表面官能团的变化可能是导致石墨材料氧还原能力增强及MFCs产电性能提高的重要原因。
The graphite-granule activated by H3PO4 for oxygen reduction reaction （ORR） and as the ca- thodic material in microbial fuel cells （MFCs） was investigated. The cyclic voltammetry （CV） and electrochem- istry impedance spectroscopy （EIS） were performed in order to investigate the ORR on the graphite-granule acti- vated by H3PQ. The results revealed that the graphite-granule activated by 85% H3PQ for 12 h exhibited the highest electrocatalytic activity for the ORR. The activated and untreated graphite was used as the cathodic mate- rial in MFCs, measuring the polarization curves and power density curves. The MFCs with graphite-granule acti- vated by H3PO4 as cathode （P-cathode） generated a maximum power density （7.92 W/m3） , 2.4 times higher than the untreated MFCs. The determination of specific surface area by multipoint BET method showed that the specific surface area of graphite-granule activated by H3PO4（7. 716 mE/g） was a bit smaller than the untreated one （10. 940 mE/g）. However, fourier transform infrared spectroscopy （FTIR） demonstrated that the quantity and species of surface function groups have been changed a lot, which could explain the enhancement of ORR and the improvement in cathode performance.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第7期2454-2460,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(20906026)
上海市浦江人才计划(09PJ1402900)
中央高校基本科研业务费专项资金资助项目(WB0914036)
教育部留学回国人员启动基金(B200-C-0904)
关键词
微生物燃料电池(MFCs)
石墨
活化
氧还原
microbial fuel cells （MFCs）
graphite
activation
oxygen reduction reaction （ORR）
