Journal
CHEMICAL COMMUNICATIONS
Volume 58, Issue 14, Pages 2323-2326Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cc07042h
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Funding
- Australian Research Council [FT170100224, LP200100255]
- Australian Research Council [LP200100255] Funding Source: Australian Research Council
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In this study, a highly active Fe-N-C electrocatalyst containing Fe nanoparticles and FeNx active sites derived from Fe-doped carbonized zeolitic imidazolate framework (ZIF-8) was developed. The optimized Fe doping amount in the Fe-N-C-300 composite catalyst exhibited excellent activity, stability, and methanol tolerance in challenging acid environment.
Replacing Pt-based catalysts with cost-effective, highly efficient, and durable platinum group metal-free catalysts for the oxygen reduction reaction (ORR) is crucial for commercializing hydrogen fuel cells. Herein, we present a highly active Fe-N-C electrocatalyst that contains both Fe nanoparticles and FeNx active sites derived from an Fe-doped carbonized zeolitic imidazolate framework (ZIF-8). It is found that adjusting the doping amount of Fe in the Fe-doped ZIF-8 precursor alters the morphology of the catalyst after heat treatment. The Fe-N-C-300 composite catalyst with the optimized Fe doping amount exhibits excellent activity, good stability, and remarkable methanol tolerance in the challenging acid environment. This study reveals that a suitable amount of Fe nanoparticles in the catalyst can alter the structure of the FeNx active moieties and increase three-phase boundaries to boost the mass transport, thus leading to improved fuel cell performance. This will have implications for using Fe-N-C catalysts in real applications, as the formation of Fe NPs during the synthesis and reaction is almost inevitable.
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