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The use of different electrode materials for electricity production in a microbial fuel cell using a Klebsiella oxytoca microorganism under different operating conditions

Author(s):

Israa K. Abdul-Wahid, Saleem M. Obyed and Basim O. Hasan*   Pages 1 - 12 ( 12 )

Abstract:


Microbial fuel cells (MFCs) have been developed impressively over the recent years. In order to take this technology from research to application, the performance of these systems needs to be further investigated and optimized. The electrode materials and operating conditions play a vital role in MFCs performance. In the current work, dual chamber MFC was used to investigate the performance of different electrode materials under stationary and flow conditions. Microorganism solution of Klebsiella oxytoca and Citrobacter Freundii inoculum was used in anode chamber. Three electrode materials were investigated namely; activated carbon, graphite, and titanium. High current density and power output were obtained by activated carbon electrode and graphite, while titanium showed poor performance for bio-electricity production. The low flow velocity (or Reynolds number) in catholyte was found to enhance the energy production, while the high velocity caused a reduction in the produced current. The aeration of cathode chamber had a negative effect on the produced current due to the transfer of dissolved oxygen to microorganism chamber. Activated carbon showed high performance due to its high surface area with a maximum power density achieved was 462.74 mW/m2 at Reynolds number of 7030.

Keywords:

Microbial fuel cell; electrode material; anaerobic microorganism; flow velocity; aeration

Affiliation:

Department of Chemical Engineering, Al-Nahrain University, Department of Chemical Engineering, Al-Nahrain University, Department of Chemical Engineering, Al-Nahrain University



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