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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, metal-air batteries, ceramic membranes, PEMFC

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Defect-Free Encapsulation of Fe0 in 2D Fused Organic Networks as a Durable Oxygen Reduction Electrocatalyst

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Title
Defect-Free Encapsulation of Fe0 in 2D Fused Organic Networks as a Durable Oxygen Reduction Electrocatalyst
Author
Kim, Seok-JinMahmood, JaveedKim, ChangminHan, Gao-FengKim, Seong-WookJung, Sun-MinZhu, GuominYoreo, James J. DeKim, GuntaeBaek, Jong-Beom
Issue Date
201802
Publisher
AMER CHEMICAL SOC
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, non-precious 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 and 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.
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DOI
http://dx.doi.org/10.1021/jacs.7b10663
ISSN
0002-7863
Appears in Collections:
ECHE_Journal Papers

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