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An innovative powerful and mediatorless H2/O2 biofuel cell based on an outstanding bioanode

by: A. Ciaccafava, A. De Poulpiquet, V. Techer, M. T. Giudici-Orticoni, S. Tingry, C. Innocent, E. Lojou
Electrochemistry Communications, Vol. 23 (September 2012), pp. 25-28, doi:10.1016/j.elecom.2012.06.035  Key: citeulike:10867294

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Abstract

A H2/O2 biofuel cell based on a hyperthermophilic O2-tolerant hydrogenase and bilirubin oxidase was designed by one step covalent immobilization of the enzymes on functionalized carbon nanotubes. Under pure H2 and O2 saturated buffer solutions and no redox mediator, the biofuel cell delivers power densities up to 300 Î¼W cm- 2 at 0.6 V with an open circuit voltage of 1.1 V. These performances, which are demonstrated to be dependent on hydrogenase characteristics at high potentials, are the best ever obtained. Promising stability of the biofuel cell during 24 h of continuous use has been obtained, which allows considering this device as an alternative power supply for small portable applications. ⺠Mediatorless H2/O2 biofuel cell based on O2-tolerant hydrogenase and bilirubin oxidase. ⺠Covalent enzyme immobilization on carbon nanotubes. ⺠Hydrogenase characteristics at high potential determine the cell performance. ⺠Delivering of 300 Î¼W cm- 2 power density at 0.6 V with an OCV of 1.1 V.


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