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

Document created by Kamaraj Sathish kumar on Aug 22, 2014
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  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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