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    Frontiers in Energy Research 07/2014; 2. DOI:10.3389/fenrg.2014.00026
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    ABSTRACT: The performance of photo microbial fuel cells (photo-MFCs) with Desmodesmus sp. A8 as cathodic microorganism under different light intensities (0, 1500, 2000, 2500, 3000, 3500 lx) was investigated. The results showed that illumination enhanced the output of the photo-MFC three-fold. When light intensity was increased from 0 to 1500 lx, cathode resistance decreased from 3152.0 to 136.7 Ω while anode resistance decreased from 13.9 to 11.3 Ω. In addition, the cathode potential increased from −0.44 to −0.33 V (vs. Ag/AgCl) and reached a plateau as the light intensity was increased from 1500 lx to 3500 lx. Accompanied with the potential change, dissolved oxygen (DO) within the cathode biofilm increased to 13.2 mg L−1 under light intensity of 3500 lx and dropped to 7.5 mg L−1 at 1500 lx. This work demonstrated that light intensity profoundly impacted the performance of photo-MFC with Desmodesmus sp. A8 through changing the DO.
    Applied Energy 03/2014; 116:86-90. DOI:10.1016/j.apenergy.2013.11.066 · 5.26 Impact Factor
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    ABSTRACT: Microbial fuel cell (MFC) units which are connected in series and parallel, may increase MFC performance in forms of voltage and current respectively. In this research three individual MFC units were connected with different concentrations (10,20 and 30 g l(-1)) of glucose, fructose and sucrose. Generated power and current were analyzed through polarization and voltage curves. Parallel connections of three units, which fed with 10 g l(-1) of each substrate, resulted in voltage and power densities of 0.65 V and 72.77 mW m(-2), respectively. This configuration produced current density of 191.36 mA m(-2) which was approximately three times higher than a single unit. By similar configuration but in series, produced voltage was increased to 1.78 V, as long as power and current densities were about at the same level of one single unit (52.35 mW m(-2)and 57.6 mA m(-2)). Substrate concentration enhancement to 20 and 30 g l(-1) resulted in the same magnitude of increase for cell performances compared to the single unit results. Serial connection of 20 g l(-1) of three substrates (glucose, fructose and sucrose) showed the highest results compared to other understudied substrate concentrations; 109.45 mW m(-2) of power density, 98.14 mA m(-2) of current density and 2.042 V as voltage. Shift of MFC configuration to parallel connection demonstrated 381.44 mA m(-2), 128.72 mW m(-2) and 0.68 V as current, power densities and voltage respectively. This configuration corresponds to the lowest calculated internal resistance.
    Energy Conversion and Management 11/2013; 75:256-262. DOI:10.1016/j.enconman.2013.06.032 · 3.59 Impact Factor