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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

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Parallel screening of electrocatalyst candidates using bipolar electrochemistry.

Stephen E Fosdick¹, Sean P Berglund, C Buddie Mullins

¹Department of Chemistry and Biochemistry and the Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, 105 E. 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.

Analytical Chemistry

|February 8, 2013

Summary

This study introduces a novel method for rapidly screening bimetallic electrocatalysts for the oxygen reduction reaction (ORR) using bipolar electrochemistry. The technique allows simultaneous testing of multiple catalysts, accelerating the discovery of efficient ORR electrocatalysts.

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Area of Science:

Electrochemistry
Materials Science
Catalysis

Background:

The oxygen reduction reaction (ORR) is crucial for energy conversion technologies like fuel cells.
Developing efficient and cost-effective electrocatalysts for ORR is a key challenge.
Current screening methods can be time-consuming and resource-intensive.

Purpose of the Study:

To develop a high-throughput screening method for bimetallic electrocatalyst candidates for the ORR.
To demonstrate the simultaneous screening of multiple electrocatalysts using bipolar electrochemistry.
To evaluate Pd-M (M = Au, Co, W) bimetallic electrocatalysts.

Main Methods:

Simultaneous screening of electrocatalysts using bipolar electrodes (BPEs).
Preparation of bimetallic catalyst precursors on BPEs followed by reduction.
Electrochemical analysis driven by voltage applied to the electrolyte, with current generated by Cr microband oxidation.
Quantification of catalyst performance by counting remaining Cr microbands.

Main Results:

Successfully screened up to 33 electrocatalyst candidates simultaneously in approximately 10 minutes.
Demonstrated the ability to evaluate the onset potential for ORR based on Cr microband dissolution.
Evaluated Pd-Au, Pd-Co, and Pd-W bimetallic electrocatalysts.

Conclusions:

Bipolar electrochemistry offers a rapid and efficient approach for simultaneous screening of electrocatalyst libraries.
This method can be scaled to screen arbitrarily large libraries of potential electrocatalysts.
The technique facilitates accelerated discovery of advanced ORR electrocatalysts.