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Combinatorial Screening of Anode and Cathode Electrocatalysts for Direct Methanol Fuel Cells

Published online by Cambridge University Press:  15 February 2011

Epok Reddington ,
Jong-Sung Yu ,
Anthony Sapienza ,
Benny C. Chan ,
Bogdan Gurau ,
Rameshkrishnan Viswanathan ,
Renxuan Liu ,
Eugene S. Smotkin ,
S. Sarangapani  and
Thomas E. Mallouk
Epok Reddington
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
Jong-Sung Yu
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
Anthony Sapienza
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
Benny C. Chan
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
Bogdan Gurau
Affiliation:
Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616
Rameshkrishnan Viswanathan
Affiliation:
Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616
Renxuan Liu
Affiliation:
Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616
Eugene S. Smotkin
Affiliation:
Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616
S. Sarangapani
Affiliation:
CET, Inc., 916 Pleasant St. #12, Norwood, MA 02062
Thomas E. Mallouk
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
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Abstract

Progress in several important electrochemical technologies, including batteries, fuel cells, sensors, and electrosynthesis, is currently materials-limited. A common feature of all electrode reactions is the imbalance (i.e., loss or generation) of ions at the electrode surface. We describe in this paper a method by which excess ions in the electrode diffusion layer can be imaged, and used to identify the best electrode materials from a combinatorial array of compositions.

Although in principle this method can be applied to many electrochemical problems, we have focused on finding better electrocatalysts for direct methanol fuel cells (DMFCs). The DMFC performs two half-cell reactions: oxidation of methanol, and reduction of oxygen. Two of the most important problems in DMFCs are the poor performance of the electrocatalysts, and the crossover of methanol from the anode to the cathode side of the cell. An ideal situation would be the simultaneous development of two new catalysts: an anode that oxidizes methanol at low overpotential, and a “methanol-tolerant” cathode that reduces oxygen without oxidizing methanol.

Based on previously developed rules for predicting the activity of ternary alloy catalysts (Ley, et al., J. Electrochem. Soc. 1997, 144, 1543), we began searching quaternary combinations of noble metals for the anode, and ruthenium selenide-type materials for the cathode reaction. The anode and cathode reactions generate and consume protons, respectively, creating a substantial pH gradient at the electrode surface. Changes in local pH are imaged by means of an appropriate fluorescent indicator: Ni-PTP for the anode and Eosin Y for the cathode. DMFC testing confirms the utility of the screening method, in that a Pt/Ru/Os/Ir quaternary catalyst was substantially superior to the best binary and ternary catalysts prepared under similar conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 549: Symposium FF – Advanced Catalytic Materials - 1998 , 1998 , 231
Copyright
Copyright © Materials Research Society 1999

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