Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA; School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, 129 Luoyu Road, Wuhan 430079, PR China.
Bioresour Technol. 2019 Oct;290:121759. doi: 10.1016/j.biortech.2019.121759. Epub 2019 Jul 6.
Degradation of cathode performance over time is one of the major drawbacks in applications of microbial fuel cells (MFCs) for wastewater treatment. Over a two month period the resistance of air cathodes (R) with a polyvinylidene fluoride (PVDF) diffusion layer increased of 111% from 70 ± 10 mΩ m to 148 ± 32 mΩ m. Soaking the cathodes in hydrochloric acid (100 mM HCl) restored cathode performance to R = 74 ± 17 mΩ m. Steam, ethanol, or sodium hydroxide treatment produced only a small change in performance, and slightly increased R. With a polytetrafluoroethylene (PTFE) diffusion layer on the cathodes, R increased from 54 ± 14 mΩ m to 342 ± 142 mΩ m after two months of operation. The acid concentration was critical for effectiveness in cleaning, as HCl (100 mM) decreased R to 28 ± 8 mΩ m. A lower concentration of HCl (<1 mM) showed no improvement, and vinegar (5% acetic acid) produced 48 ± 4 mΩ m.
随着时间的推移，阴极性能的退化是微生物燃料电池（MFC）在废水处理应用中的主要缺点之一。在两个月的时间里，带有聚偏二氟乙烯（PVDF）扩散层的空气阴极（R）的电阻从 70±10 mΩ·m 增加到 148±32 mΩ·m，增加了 111%。将阴极浸泡在盐酸（100 mM HCl）中可将阴极性能恢复到 R=74±17 mΩ·m。蒸汽、乙醇或氢氧化钠处理仅对性能产生微小变化，略微增加了 R。在阴极上使用聚四氟乙烯（PTFE）扩散层后，经过两个月的运行，R 从 54±14 mΩ·m 增加到 342±142 mΩ·m。酸浓度对清洁效果至关重要，因为 100 mM HCl 将 R 降低到 28±8 mΩ·m。较低浓度的 HCl（<1 mM）没有改善效果，而醋（5%乙酸）产生 48±4 mΩ·m。
