Journal
ACS ENERGY LETTERS
Volume 2, Issue 7, Pages 1489-1493Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00391
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Funding
- University of New Mexico Center for Micro-Engineered Materials
- NSF GRFP [1418062]
- Division Of Graduate Education
- Direct For Education and Human Resources [1418062] Funding Source: National Science Foundation
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For targeted development of platinum group metal free (PGM-free) catalysts for proton exchange membrane fuel cell applications, it is critically important to elucidate the catalytic moieties of Fe-N-C materials as they relate to the structure and morphology of the graphitic layers of carbon, the catalyst basic building blocks. In this Letter, X-ray diffraction analysis with a carbon-specific structure refinement algorithm was performed on 12 Fe-N-C catalysts. Samples with fewer graphitic layers exhibit increased kinetic performance in fuel cell testing. This trend is consistent with the dominant active species residing within the graphitic plane as opposed to at the edges. We also report the performance of an optimized catalyst based on structure property predictions derived in a recently published report. This catalyst produces 0.44 mA cm(-2) at 0.85 V and has a maximum power density of 490 mW cm(-2) in 1 bar O-2 (not iR corrected).
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