Microbial fuel cells;
Air cathode;
Oxygen crossover;
Diffusion layer;
D O I:
暂无
中图分类号:
学科分类号:
摘要:
Microbial fuel cells (MFCs) can be built with layered electrode assemblies, where the anode, proton exchange membrane (PEM), and cathode are pressed into a single unit. We studied the performance and microbial community structure of MFCs with layered assemblies, addressing the effect of materials and oxygen crossover on the community structure. Four MFCs with layered assemblies were constructed using Nafion or Ultrex PEMs and a plain carbon cloth electrode or a cathode with an oxygen-resistant polytetrafluoroethylene diffusion layer. The MFC with Nafion PEM and cathode diffusion layer achieved the highest power density, 381 mW/m2 (20 W/m3). The rates of oxygen diffusion from cathode to anode were three times higher in the MFCs with plain cathodes compared to those with diffusion-layer cathodes. Microsensor studies revealed little accumulation of oxygen within the anode cloth. However, the abundance of bacteria known to use oxygen as an electron acceptor, but not known to have exoelectrogenic activity, was greater in MFCs with plain cathodes. The MFCs with diffusion-layer cathodes had high abundance of exoelectrogenic bacteria within the genus Geobacter. This work suggests that cathode materials can significantly influence oxygen crossover and the relative abundance of exoelectrogenic bacteria on the anode, while PEM materials have little influence on anode community structure. Our results show that oxygen crossover can significantly decrease the performance of air-cathode MFCs with layered assemblies, and therefore limiting crossover may be of particular importance for these types of MFCs.
机构:
Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USATsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
Ren, Lijiao
Stager, Jennifer
论文数: 0引用数: 0
h-index: 0
机构:
Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USATsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
Stager, Jennifer
Evans, Patrick J.
论文数: 0引用数: 0
h-index: 0
机构:
CDM Smith, Bellevue, WA 98007 USATsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
Evans, Patrick J.
Logan, Bruce E.
论文数: 0引用数: 0
h-index: 0
机构:
Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USATsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
机构:
Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Key Lab Water & Sediment Sci,Minist Educ, Beijing 100875, Peoples R ChinaBeijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Key Lab Water & Sediment Sci,Minist Educ, Beijing 100875, Peoples R China
Quan, Xiang-chun
Quan, Yan-ping
论文数: 0引用数: 0
h-index: 0
机构:
Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Key Lab Water & Sediment Sci,Minist Educ, Beijing 100875, Peoples R ChinaBeijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Key Lab Water & Sediment Sci,Minist Educ, Beijing 100875, Peoples R China
Quan, Yan-ping
Tao, Kun
论文数: 0引用数: 0
h-index: 0
机构:
Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Key Lab Water & Sediment Sci,Minist Educ, Beijing 100875, Peoples R ChinaBeijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Key Lab Water & Sediment Sci,Minist Educ, Beijing 100875, Peoples R China