Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 1, Pages 111-118Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ee03027a
Keywords
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Funding
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [21573204, 21421063, 91745113, 11621063]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities [WK 2060190084]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology
- Ministry of Science and Technology of the People's Republic of China [2018YFA0208603]
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Atomically dispersed iron-nitrogen (FeN4) catalysts have emerged as the most promising alternative to costly Pt-based counterparts in proton exchange membrane fuel cells (PEMFCs), but often they suffer from high overpotential and poor stability due to the diverse iron-nitrogen coordination structure. Herein, we demonstrate high-purity pyrrole-type FeN4 sites for the first time, as a superior ORR electrocatalyst for PEMFCs. The high-purity pyrrole-type FeN4 catalyst exhibited extremely outstanding ORR activity with an ultra-high active area current density of 6.89 mA m(-2) in acid medium, which exceeds that of most reported metal-nitrogen coordination catalysts. Experimental and theoretical analyses reveal that high-purity pyrrole-type coordination significantly modifies the atomic and electronic structures of FeN4 sites, bringing with it high intrinsic catalytic activity, preferable O-2 adsorption energy and full four-electron reaction selectivity for ORR catalysis. Therefore, PEMFCs built with this high-purity FeN4 catalyst achieve a high open-circuit voltage (1.01 V) and a large peak power density (over 700 mW cm(-2)). High-purity iron-nitrogen coordination would give new insights into highly efficient electrocatalysts for PEMFCs.
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