The Polymer Electrolyte Membrane Fuel Cells (PEMFCs) are currently considered promising high efficiency, low environmental impact power sources. One important aspect that hinders their rapid commercialization is the high cost of the materials used to prepare the electrodes, based on Pt and Pt alloys due to their high activity and chemical stability1. For this reason, the development of platinum free electrocatalysts, inexpensive, stable, and able to significantly reduce the overvoltage for Oxygen Reduction Reaction (ORR) represents a major challenge in the development of PEMFCs. Moreover, the possibility of a large commercialization of PEMFC is strictly connected to the availability of hydrogen; for this reason the development of bifunctional fuel cell/water electrolysis systems, Unitized Reversible Fuel Cell URFC, are strategic and this can be accomplished by developing new materials able to catalyze both ORR and Oxygen Evolution Reaction (OER).The high catalytic activity of IrO2-based composite electrodes toward OER is well known2 and largely studied. This contribution presents new results on electrochemical characterization of IrO2-SnO2 nanostructured powder, synthetized by sol-gel technique and containing 15% mol of iridium under ORR condition. The investigation is carried out using potentiodynamic techniques and the Rotating Ring Disk Electrode at different at different pH values. Acknowledgements: The financial contributions of PUR (2009 – 2010) and PRIN 2008 - 2008N7CYL5_004 funds are gratefully acknowledged. C. L. wish to thank the Oronzio and Niccolò De Nora Foundation for her Research Fellowships 1. Yu-Hung Shing, Guggilla Vidya Sagar, Shawn D. Lin, J. Phys Chem. C. 2008, 112 (1) 123-130, DOI:10.1021/jp071807h 2. S. Ardizzone, C. Bianchi, L. Borgese, G. Cappelletti, C. Locatelli, A. Minguzzi, S. Rondinini, A.Vertova, P. Ricci, C. Cannas, A. Musinu, J. Appl. Electrochem. 2009, 39: 2093-2105 DOI: 10.1007/s10800-009-9895-1
Electrocatalytic IrO2-SnO2 nanopowders:evaluation of pH effect on the kinetic of Oxygen Reduction Reaction by Rotating Ring Disk Electrode / C. Locatelli, A. Minguzzi, S. Rondinini, A. Vertova. ((Intervento presentato al convegno Giornate dell’elettrochimica italiana e Elettrochimica per il recupero dell’ambiente tenutosi a Modena nel 2010.
Electrocatalytic IrO2-SnO2 nanopowders:evaluation of pH effect on the kinetic of Oxygen Reduction Reaction by Rotating Ring Disk Electrode
C. Locatelli;A. Minguzzi;S. Rondinini;A. Vertova
2010
Abstract
The Polymer Electrolyte Membrane Fuel Cells (PEMFCs) are currently considered promising high efficiency, low environmental impact power sources. One important aspect that hinders their rapid commercialization is the high cost of the materials used to prepare the electrodes, based on Pt and Pt alloys due to their high activity and chemical stability1. For this reason, the development of platinum free electrocatalysts, inexpensive, stable, and able to significantly reduce the overvoltage for Oxygen Reduction Reaction (ORR) represents a major challenge in the development of PEMFCs. Moreover, the possibility of a large commercialization of PEMFC is strictly connected to the availability of hydrogen; for this reason the development of bifunctional fuel cell/water electrolysis systems, Unitized Reversible Fuel Cell URFC, are strategic and this can be accomplished by developing new materials able to catalyze both ORR and Oxygen Evolution Reaction (OER).The high catalytic activity of IrO2-based composite electrodes toward OER is well known2 and largely studied. This contribution presents new results on electrochemical characterization of IrO2-SnO2 nanostructured powder, synthetized by sol-gel technique and containing 15% mol of iridium under ORR condition. The investigation is carried out using potentiodynamic techniques and the Rotating Ring Disk Electrode at different at different pH values. Acknowledgements: The financial contributions of PUR (2009 – 2010) and PRIN 2008 - 2008N7CYL5_004 funds are gratefully acknowledged. C. L. wish to thank the Oronzio and Niccolò De Nora Foundation for her Research Fellowships 1. Yu-Hung Shing, Guggilla Vidya Sagar, Shawn D. Lin, J. Phys Chem. C. 2008, 112 (1) 123-130, DOI:10.1021/jp071807h 2. S. Ardizzone, C. Bianchi, L. Borgese, G. Cappelletti, C. Locatelli, A. Minguzzi, S. Rondinini, A.Vertova, P. Ricci, C. Cannas, A. Musinu, J. Appl. Electrochem. 2009, 39: 2093-2105 DOI: 10.1007/s10800-009-9895-1
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