Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks.
basic_science · Level V
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- Record sourced from PubMed, PMID 30409809.
- Also identified by DOI 10.1126/science.aau0630.
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Abstract
Achieving high catalytic performance with the lowest possible amount of platinum is critical for fuel cell cost reduction. Here we describe a method of preparing highly active yet stable electrocatalysts containing ultralow-loading platinum content by using cobalt or bimetallic cobalt and zinc zeolitic imidazolate frameworks as precursors. Synergistic catalysis between strained platinum-cobalt core-shell nanoparticles over a platinum-group metal (PGM)-free catalytic substrate led to excellent fuel cell performance under 1 atmosphere of O<sub>2</sub> or air at both high-voltage and high-current domains. Two catalysts achieved oxygen reduction reaction (ORR) mass activities of 1.08 amperes per milligram of platinum (A mg<sub>Pt</sub> <sup>-1</sup>) and 1.77 A mg<sub>Pt</sub> <sup>-1</sup> and retained 64% and 15% of initial values after 30,000 voltage cycles in a fuel cell. Computational modeling reveals that the interaction between platinum-cobalt nanoparticles and PGM-free sites improves ORR activity and durability.