title: Assessment of a metal-organic framework catalyst in air cathode microbial fuel cells over time with different buffers and solutions.
abstract: Metal-organic framework (MOF) on activated carbon (AC) enhanced the performance of cathodes but longevity needs to be considered in the presence of metal chelators or ligands, such as phosphate, present in wastewaters. MOF catalysts on AC initially produced 2.78±0.08Wm-2, but power decreased by 26% after eight weeks in microbial fuel cells using a 50mM phosphate buffer (PBS) and acetate due to decreased cathode performance. However, power was still 41% larger than that of the control AC (no MOF). Power generation using domestic wastewater was initially 0.73±0.01Wm-2, and decreased by 21% over time, with power 53% larger than previous reports, although changes in wastewater composition were a factor in performance. Adding phosphate salts to the wastewater did not affect the catalyst performance over time. While MOF catalysts are therefore initially adversely affected by chelators, performance remains enhanced compared to plain AC.
authors.affiliation: Dipartimento di Chimica Industriale e dei Materiali "Toso Montanari", Università degli studi di Bologna, Bologna 40136, Italy.
authors.forename: Ruggero
authors.initials: R
authors.lastname: Rossi
authors.affiliation: Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Wulin
authors.initials: W
authors.lastname: Yang
authors.affiliation: Dipartimento di Chimica Industriale e dei Materiali "Toso Montanari", Università degli studi di Bologna, Bologna 40136, Italy.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Setti
authors.affiliation: Department of Civil and Environmental Engineering, The Pennsylvania State University, 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; D002021:Buffers; D002384:Catalysis; D004566:Electrodes; D008670:Metals
chemical_list: D002021:Buffers; D008670:Metals
keywords: Air cathode; Fe–N–C/AC catalyst; MFC; MOF; Power density