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Carbon-supported Pd-Co as cathode catalyst for APEMFCs and validation by DFT.

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¹CSIR-Central Electrochemical Research Institute-Madras Unit, CSIR Complex, Chennai, 600 113, India.

Physical Chemistry Chemical Physics : PCCP

|June 14, 2012

Summary

The study found that PdCo(3:1)/C nanocatalysts exhibit superior performance for the oxygen reduction reaction (ORR) in alkaline fuel cells compared to Pd/C and other PdCo ratios. This enhanced activity is attributed to synergistic effects between palladium and cobalt.

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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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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Developing efficient electrocatalysts is crucial for advancing fuel cell technology.
Palladium-cobalt (PdCo) alloys show promise for oxygen reduction reaction (ORR) catalysis.

Purpose of the Study:

To synthesize and characterize carbon-supported PdCo nanocatalysts with varying Pd:Co ratios.
To evaluate their electrocatalytic activity for ORR in alkaline media and alkaline polymer electrolyte membrane fuel cells (APEMFCs).
To elucidate the origin of enhanced catalytic performance using first-principles calculations.

Main Methods:

Synthesis of PdCo/C nanocatalysts with Pd:Co ratios of 1:1, 2:1, and 3:1.
Characterization using X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), and Cyclic Voltammetry (CV).
Electrochemical evaluation via Linear Sweep Voltammograms (LSV) using a rotating ring disk electrode and testing in APEMFCs.

Main Results:

PdCo(3:1)/C demonstrated significantly higher performance (85 mW cm(-2)) than Pd/C and other PdCo ratios.
The PdCo(3:1)/C catalyst exhibited maximum electrocatalytic activity for ORR, even in the presence of methanol.
First-principles calculations provided insights into the enhanced activity, relating it to O(2) adsorption energy, structural variations, and charge transfer.

Conclusions:

The PdCo(3:1)/C nanocatalyst is a highly effective electrocatalyst for ORR in alkaline environments.
The synergistic interaction between Pd and Co in the 3:1 ratio significantly enhances catalytic activity.
This study provides a foundation for designing advanced catalysts for fuel cell applications.