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Study of Anode Deactivation for Biofuel Cell Design

Applied Biotechnology Innovation Centre. HEALTHY AIMS PROJECT. Study of Anode Deactivation for Biofuel Cell Design. Frank Jeyson Hernandez. Thesis Project Course. Universitat Rovira i Virgili Tarragona - Spain. 3 rd February, 2005. Applied Biotechnology Innovation Centre.

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Study of Anode Deactivation for Biofuel Cell Design

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  1. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Study of Anode Deactivation for Biofuel Cell Design Frank Jeyson Hernandez Thesis Project Course Universitat Rovira i Virgili Tarragona - Spain 3rd February, 2005

  2. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Anode: 2 H2 4e- + 4H+ Cathode: O2 + 4e- + 4H+ 2 H2O Definition of Fuel Cell A fuel cell is a device that generates electricity from a fuel (hydrogen or hydrogen-rich fuel) and oxygen by an electrochemical process. Operational principle

  3. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT R e- e- S CoPOs POs P GDH (PQQ) HRP S P cathode anode Definition of Biofuel Cell Biofuel cells use biocatalysts for the conversion of chemical energy to electrical energy. Pcell = Vcell x Icell GDH (PQQ): Glucose Dehydrogenase (PQQ-dependent ) HRP: Horseradish Peroxidase

  4. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT PQQ-GDH (reduced) Gluconolactone Os (oxidized) ANODE PQQ-GDH (oxidized) Os (reduced) Glucose 2e- 2e- 2e- HRP (oxidized) Os (reduced) H2O CATHODE HRP (reduced) Os (oxidized) H2O2 2e- 2e- 2e- Biofuel Cell Reaction Product Substrate Product Substrate

  5. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT G G G G G G G G G G G PQQ PQQ PQQ PQQ e- Os Os Os Os Os Os Os e- Surface Electrode Study of Anode Deactivation Anode Composition Gluconolactone + e- CoPOs, E0’=+210 mV vs Ag/AgCl

  6. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT R e- e- CoPOs POs GDH PQQ HRP Potentiostat Cathode Anode FLt [Cenz] j = 1 + Ks +K2 Cs +COs Study of Anode Deactivation Methodology: (ChronoAmperometry) An electrochemical measuring technique used for electrochemical analysis or for the determination of the kinetics and mechanism of electrode reactions. Equation Model

  7. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Glucose Results I • The loss of current in the electrode was fast and similar to biofuel cells response • Further experiments are needed in order to explain the deactivation. Max Current Density= 1920 µA/cm2

  8. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Glucose Gluc + H2O2 Gluc + PQQSolut Gluc + PQQSurf . GDH PQQ GDH + PQQ Max Current Density= 1920 µA/cm2 Results II • We have obtained an electode half life of 2.48 h. and we have demonstrated that in the presence of the PQQ cofactor in the cell, the half life period becomes 30 h.

  9. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Conclusions • These results suggest that the anode deactivation was produced by the leaching of the PQQ cofactor of enzyme. • This anode can produce high values of current density (1920µA cm-2) in the electro-oxidation process.

  10. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Future Work • Second Part • To evaluate new polymers and improve the biofuel cell system • To evaluate the stability of biofuel cell with optimal anode and cathode • First Part • To solve the leaching problem of PQQ in the anode • To study the deactivation cathode

  11. Applied Biotechnology Innovation Centre HEALTHY AIMS PROJECT Acknowledgements • HEALTHY AIMS project (IST-1-001837-IP) • Universitat Rovira i Virgili • DINAMIC Applied Biotechnology Innovation Centre • Bioengineering & Bioelectrochemistry Group

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