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Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
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Defect-Free Encapsulation of Fe0 in 2D Fused Organic Networks as a Durable Oxygen Reduction Electrocatalyst

Author(s)
Kim, Seok-JinMahmood, JaveedKim, ChangminHan, Gao-FengKim, Seong-WookJung, Sun-MinZhu, GuominYoreo, James J. DeKim, GuntaeBaek, Jong-Beom
Issued Date
2018-02
DOI
10.1021/jacs.7b10663
URI
https://scholarworks.unist.ac.kr/handle/201301/23237
Fulltext
http://pubs.acs.org/doi/abs/10.1021/jacs.7b10663
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.140, no.5, pp.1737 - 1742
Abstract
Because they provide lower cost but comparable activity to precious platinum (Pt)-based catalysts, nonprecious iron (Fe)-based materials, such as Fe/Fe3C and Fe-N-C, have gained considerable attention as electrocatalysts for the oxygen reduction reaction (ORR). However, their practical application is hindered by their poor stability, which is attributed to the defective protection of extremely unstable Fe nanoparticles. Here, we introduce a synthesis strategy for a stable Fe-based electrocatalyst, which was realized by defect-free encapsulation of Fe nanoparticles using a two-dimensional (2D) phenazine-based fused aromatic porous organic network (Aza-PON). The resulting Fe@Aza-PON catalyst showed electrocatalytic activity (half-wave potential, 0.839 V; Tafel slope, 60 mV decade(-1)) comparable to commercial Pt on activated carbon (Pt/C, 0.826 V and 90 mV decade-1). More importantly, the Fe@Aza-PON displayed outstanding stability (zero current loss even after 100 000 cycles) and tolerance against contamination (methanol and CO poisoning). In a hybrid Li-air battery test, the Fe@Aza-PON demonstrated performance superior to Pt/C.
Publisher
AMER CHEMICAL SOC
ISSN
0002-7863
Keyword
CONJUGATED MICROPOROUS POLYMERSOF-THE-ARTIRON CARBIDEGRAPHITIC LAYERSEFFICIENTTRANSITIONFRAMEWORKSCATALYSTSSITES

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