Kamaraj Sathish kumar - Electrical Stress-Directed Evolution of Biocatalyst Texcoco Soil Community for Microbial Fuel Cell

Version 1

      Publication Details (including relevant citation   information):

      ECS Transactions, 36 (1) 3-11 (2011)

      10.1149/1.3660593 © The Electrochemical Society


      Anode-respiring bacteria (ARB) perform an unusual form of

      respiration in which their electron acceptor is a solid anode.   The

      focus of this study was to characterize the electrical stress   direct

      evolution of biocatalysts as a way of enriching the community   with

      ARB for microbial fuel cell. We gave the electrical stress

      continually to the Texcoco bacterial community at -150mV/SCE.

      The 4th day current started to increase and attained the maximum

      current of 0.35mA in the 15 th day. The current in this period   was

      associated to biofilm growth. On the 15thday and by using cyclic

      voltammetry, an irreversible electron transfer reaction of

      alkaliphilic cytochrome was found, due to the electrode fouling.

      From the impedance measurement, the biofilm ARB resistance was

      determined (~250Ω). Further confocal microscopy studies of

      biofilm ARB revealed ~6μm thickness. In the single chamber

      microbial fuel cell, the electrochemical stressed biofilm-ARB

      exhibited a maximum power density of 79mW/m2

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