Kamaraj Sathish kumar - Comparison of Various Techniques to Characterize a Single Chamber Microbial Fuel Cell  Loaded with Sulfate Reducing Biocatalysts

Version 1

      Publication Details (including relevant citation   information):

      Received: November 25, 2011, Accepted: February 02, 2012,   Available online: April 02, 2012

      Abstract:

      Abstract: A single-chamber microbial fuel cell (SCMFC) with a   carbon supported Pt-cathode for the oxygen reduction reaction   (ORR),

      and loaded with a sulfate reducing bacterial consortium as   biocatalyst in the anodic chamber was characterized by   polarization by vari-

      able resistance (VR) and linear sweep voltammetry (LSV) methods.   From VR a whole cell configuration maximum volumetric power of

      92.5 mW m-3

      was attained at a current density of 459 A m-3

      and voltage of 0.202 V. The LSV method of whole cell   configuration gave a

      higher maximum power density of 197.5 mW m-3

      at current density of 696 mA m-3

      at the potential of 0.284V; this disagreement was as-

      cribed to possible reduction of power and potential overshoot   with the LSV. There was a fair agreement between internal   resistance values

      of whole cell configuration determined by VR and electrochemical   impedance spectroscopy (EIS): 2225 and 2307 Ω, respectively. Yet,

      internal resistance measured by LSV was 30% lower for the whole   cell configuration. Both LSV and EIS show the advantage of   reduced

      potential overshoot; yet, EIS provides more detailed information   on equivalent circuit of the cell and resistance contributions of   the elec-

      trodes, electrolyte and membrane. Further cyclic voltammetry   tests gave midpoint potential of -0.215 V vs saturated calomel   electrode, a

      value close to those reported for bacterial cytochromes involved   in extracellular electron transfer processes. It is concluded   that in spite of

      particular advantages of some techniques over others, the   combination of electrochemical methods can be very valuable for   shedding light

      and internal checking of the main characteristics of a microbial   fuel cell.

      Address (URL): http://www.groupes.polymtl.ca/jnmes/modules/journal/index.php/content0751.html