A Single-Chamber Microbial Fuel Cell without an Air Cathode
Open Access
- 22 March 2012
- journal article
- research article
- Published by MDPI AG in International Journal of Molecular Sciences
- Vol. 13 (3), 3933-3948
- https://doi.org/10.3390/ijms13033933
Abstract
Microbial fuel cells (MFCs) represent a novel technology for wastewater treatment with electricity production. Electricity generation with simultaneous nitrate reduction in a single-chamber MFC without air cathode was studied, using glucose (1 mM) as the carbon source and nitrate (1 mM) as the final electron acceptor employed by Bacillus subtilis under anaerobic conditions. Increasing current as a function of decreased nitrate concentration and an increase in biomass were observed with a maximum current of 0.4 mA obtained at an external resistance (Rext) of 1 KΩ without a platinum catalyst of air cathode. A decreased current with complete nitrate reduction, with further recovery of the current immediately after nitrate addition, indicated the dependence of B. subtilis on nitrate as an electron acceptor to efficiently produce electricity. A power density of 0.0019 mW/cm2 was achieved at an Rext of 220 Ω. Cyclic voltammograms (CV) showed direct electron transfer with the involvement of mediators in the MFC. The low coulombic efficiency (CE) of 11% was mainly attributed to glucose fermentation. These results demonstrated that electricity generation is possible from wastewater containing nitrate, and this represents an alternative technology for the cost-effective and environmentally benign treatment of wastewater.This publication has 24 references indexed in Scilit:
- Bifunctional Silver Nanoparticle Cathode in Microbial Fuel Cells for Microbial Growth Inhibition with Comparable Oxygen Reduction Reaction ActivityEnvironmental Science & Technology, 2011
- Multiphase Electrode Microbial Fuel Cell System that Simultaneously Converts Organics Coexisting in Water and Sediment phases into ElectricityEnvironmental Science & Technology, 2010
- Effects of substrate and metabolite crossover on the cathodic oxygen reduction reaction in microbial fuel cells: Platinum vs. iron(II) phthalocyanine based electrodesElectrochemistry Communications, 2009
- Lactococcus lactis catalyses electricity generation at microbial fuel cell anodes via excretion of a soluble quinoneBioelectrochemistry, 2009
- Effect of nitrate on the performance of single chamber air cathode microbial fuel cellsWater Research, 2008
- Sequential anode–cathode configuration improves cathodic oxygen reduction and effluent quality of microbial fuel cellsWater Research, 2008
- Microbial Fuel Cells: Methodology and TechnologyEnvironmental Science & Technology, 2006
- The power performance curve for engineering analysis of fuel cellsJournal of Power Sources, 2006
- Increased performance of single-chamber microbial fuel cells using an improved cathode structureElectrochemistry Communications, 2006
- Graphite electrodes as electron donors for anaerobic respirationEnvironmental Microbiology, 2004