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Mechanism of the oxygen reduction reaction from DFT calculations: Implications for improved catalysts

Goddard, William A. (2012) Mechanism of the oxygen reduction reaction from DFT calculations: Implications for improved catalysts. In: 244th ACS National Meeting & Exposition, August 19-23, 2012, Philadelphia, PA. http://resolver.caltech.edu/CaltechAUTHORS:20120822-094607639

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Abstract

In order to use d. functional theory (DFT) to seek improved catalysts for the Oxygen Redn. Reaction (ORR) in Proton Exchange Membrane fuel cells (PEMFC), we developed a systematic way to handle the barriers of electron transfer reactions [e.g. H+ + e-+ Oad e OHad] within the DFT framework. We apply this new method to detg. the optimum operating electrochem. potential for the Pt-catalyzed fuel cell and show how to est. the change in efficiency from changes in the reaction barriers. Based on our mechanism and calcd. barriers we suggest new catalysts for improved rates. Proton Exchange Membrane fuel cells (PEMFC) are most promising emission free energy systems for homes and families. However, the kinetics for the catalytic oxygen redn. reaction (ORR) 1/2 O2 + 2 H+ + 2 e e H2O remain too slow, increasing the amt. and cost of the catalyst to too high a level for widespread application. To use D. Functional Theory (DFT) to det. how the barrier would change for new alloys, a crit. issue is to account for the dependence of the electron transfer steps on the external electrochem. potential. To accomplish this we developed a systematic approach for handling the electron transfer step along with the solvation effects and including the effect of the external electrochem. potential on the electron transfer reactions involved in ORR. We applied this approach to several promising alloys to suggest new improved catalysts for ORR.


Item Type:Conference or Workshop Item (Paper)
Record Number:CaltechAUTHORS:20120822-094607639
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120822-094607639
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33441
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Aug 2012 23:07
Last Modified:27 Aug 2012 23:07

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