Publication date: 10th April 2014
Enzymatic miniature membrane-less glucose/O2 Biofuel Cells (BFCs) are of particular interest, because they may be used in implantable medical devices which requires low-power density, in the near future [1, 2]. Despite the continued improvement of the performance of these biofuel cells, the power output and lifetime are still not sufficient for direct applications, especially because of the cathode which is the limiting part of the cell.
For the elaboration of O2 reducing cathodes in these BFCs, bilirubin oxidases (BOD) have been particularly used, this sub class of the Multicopper oxidases family, was discovered in 1981 by Tanaka and Murao (Murao and Tanaka, 1981) and first used for the detection of bilirubin. Since 2001 and the pioneering work of Tsujimura, these BODs have attracted a lot of attention for the reduction of O2 because they show high activity at neutral pH, high tolerance towards NaCl and unlike laccases, there are stable in physiological conditions (20 mM phosphate buffer, pH 7.4, 0.14 M NaCl, 37 ºC).
Recent studies have shown that BOD cathode made with new species such as Bacillus pumilus and Magnaporthe oryzae displays improved performances compared to the best BOD used until now (from Trachyderma tsunodae), with a higher current and higher stability towards NaCl, temperature and urate.
Here we will report the use of BODs and the recent achievements and progress for the elaboration of efficient O2 reducing cathodes.
[1] N. Mano, F. Mao, A. Heller, J.Am. Chem. Soc. 125 2003 6588– 6594.
[2] P. Cinquin, C. Gondran, F. Giroud, S. Mazabrard, A. Pellissier, F. o. Boucher, J.-P. Alcaraz, K. Gorgy, F. Lenouvel, S. Mathé, P. Porcu, and S. Cosnier, PLoS ONE 5:e10476 2010.
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