Biocatalytic cathodes

In this section we review research on biocatalytic cathodes for oxidant reduction. The biocatalytic reduction of oxidants has only recently attracted renewed attention, with... 

An alternative strategy for co-immobilization of mediator and GOx is based on adsorption of enzyme, cross-linked, as was described for the laccase-based biocatalytic cathodes [30, 37 42], to an osmium-based redox polymer film, on carbon electrodes [1-3, 54],... 

Hudak, N.S., Gallaway, J.W., and Barton, S.C. (2009) Formation of mediated biocatalytic cathodes by electrodeposition of a redox polymer and laccase. Journal of Eiectroanaiytical Chemistry, 629 (1-2), 57-62. 

Another model is that put forward by Gu and Xu. They claim that this model can be used in explaining many MIC mysteries such as, but not limited to, the relationship between biofilm thickness and MIC-induced severe pitting, efficiency of pigging in always reducing MIC likelihood, and the often-observed lack of an existing link that correlates planktonic SRB cell counts and MIC pit-ting. The heart of this model is a new theory about MIC that has been branded by these authors as biocatalytic cathodic sulfate reduction (BCSR) theory. 

T. Gu, K. Zhao, S. Nesic. A new mechanistic model for MIC Based on a biocatalytic cathodic sulfate reduction theory. Paper No. 09390, Corrosion 2009, NACE International, Houston, TX, 2009. 

Hudak NS, Gallaway JW, Barton SC (2009) Mediated biocatalytic cathodes operating on gas-phase air and oxygen in fuel cells. J Electrochem Soc 156 B9-B15... 

Fig. 18 (a-d) The cartoons showing schematically different wirings of the biocatalytic electrodes implanted in lobsters (a) a single pair of the biocata ic cathode-anode electrodes implanted in the lobster (b) two pairs of the biocatalytic cathodes-anodes implanted into the same lobster and connected in series (c) the electrical circuitry equivalent to the wiring scheme shown in (b) (d) two pairs of the biocatalytic cathodes-anodes implanted into two different lobsters and connected in series, (e) A flow-biofuel cell with two pairs of the biocatalytic electrodes immersed in the same solution and connected in series, (f) The setup composed of five separate flow-biofuel cells used for powering the pacemaker (three biofuel cells are well visible in the front row, while two other biofuel cells are only partially visible in the back row). (Parts "a-d" and "f" are adapted from ref. 133, reproduced with permission of the Royal Society of Chemistry). 

Fig. 19 The biofuel cells composed of two pairs of the biocatalytic cathodes-anodes implanted in two lobsters wired in series and used for powering an electronic watch, (a) The operating watch powered by the implanted biofuel cells (b) the wiring scheme (c) the photo of the setup. (The figure is adapted from ref. 133, reproduced with permission of the Royal Society of Chemistry).

FIGURE 18.18 Magnetically controlled biological fuel cell with the biocatalytic anode based on the reconstituted NAD -dependent LDH and biocatalytic cathode based on the reconstituted COx/Cyt c system. Vector B shows the direction of the applied magnetic field. (Adapted with permission from Ref. [120]. Copyright 2005, American Chemical Society.)... 

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