AI Article Synopsis
- - Non-precious-metal catalysts show potential as eco-friendly substitutes for platinum in fuel cells, specifically for oxygen reduction and evolution reactions.
- - The study focused on mixed metal phthalocyanine-modified carbon nanotubes, discovering that FeCoN-MWCNT and FeMnN-MWCNT exhibit strong oxygen reduction activity, while FeNiN-MWCNT performs well in the oxygen evolution reaction.
- - The best-performing catalyst, FeCoN-MWCNT, achieved a peak power density of 692 mW/cm² when tested in anion-exchange membrane fuel cells, indicating promising efficiency for practical applications.
Article Abstract
Non-precious-metal catalysts are promising alternatives for Pt-based cathode materials in low-temperature fuel cells, which is of great environmental importance. Here, we have investigated the bifunctional electrocatalytic activity toward the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) of mixed metal (FeNi; FeMn; FeCo) phthalocyanine-modified multiwalled carbon nanotubes (MWCNTs) prepared by a simple pyrolysis method. Among the bimetallic catalysts containing nitrogen derived from corresponding metal phthalocyanines, we report the excellent ORR activity of FeCoN-MWCNT and FeMnN-MWCNT catalysts with the ORR onset potential of 0.93 V and FeNiN-MWCNT catalyst for the OER having = 1.58 V at 10 mA cm. The surface morphology, structure, and elemental composition of the prepared catalysts were examined with scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The FeCoN-MWCNT and FeMnN-MWCNT catalysts were prepared as cathodes and tested in anion-exchange membrane fuel cells (AEMFCs). Both catalysts displayed remarkable AEMFC performance with a peak power density as high as 692 mW cm for FeCoN-MWCNT.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8589254 | PMC |
| http://dx.doi.org/10.1021/acsami.1c06737 | DOI Listing |
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