title: Spray-on polyvinyl alcohol separators and impact on power production in air-cathode microbial fuel cells with different solution conductivities.
abstract: Separators are used to protect cathodes from biofouling and to avoid electrode short-circuiting, but they can adversely affect microbial fuel cell (MFC) performance. A spray method was used to apply a polyvinyl alcohol (PVA) separator to the cathode. Power densities were unaffected by the PVA separator (339±29mW/m(2)), compared to a control lacking a separator in a low conductivity solution (1mS/cm) similar to wastewater. Power was reduced with separators in solutions typical of laboratory tests (7-13mS/cm), compared to separatorless controls. The PVA separator produced more power in a separator assembly (SEA) configuration (444±8mW/m(2)) in the 1mS/cm solution, but power was reduced if a PVA or wipe separator was used in higher conductivity solutions with either Pt or activated carbon catalysts. Spray and cast PVA separators performed similarly, but the spray method is preferred as it was easier to apply and use.
authors.affiliation: Department of Civil & Environmental Engineering, Penn State University, 212 Sackett Building, University Park, PA 16802, USA.
authors.forename: Daniel L
authors.initials: DL
authors.lastname: Hoskins
authors.affiliation: Department of Civil & Environmental Engineering, Penn State University, 212 Sackett Building, University Park, PA 16802, USA; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Materials Science & Engineering, Penn State University, 310 Steidle Building, University Park, PA 16802, USA.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Hickner
authors.affiliation: Department of Civil & Environmental Engineering, Penn State University, 212 Sackett Building, University Park, PA 16802, USA. Electronic address: blogan@psu.edu.
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Logan
mesh_terms: D001674:Bioelectric Energy Sources; D004566:Electrodes; D011142:Polyvinyl Alcohol; D054712:Salinity
chemical_list: D011142:Polyvinyl Alcohol
keywords: Bioelectricity; Bioelectrochemical; Microbial fuel cell; Polyvinyl alcohol; Separators