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

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ID: 72796
2018
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Abstract
Because they provide lower cost but comparable activity to precious platinum (Pt)-based catalysts, nonprecious iron (Fe)-based materials, such as Fe/FeC 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) comparable to commercial Pt on activated carbon (Pt/C, 0.826 V and 90 mV decade). 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.
Reference Key
kim2018defectfreejournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Kim, Seok-Jin;Mahmood, Javeed;Kim, Changmin;Han, Gao-Feng;Kim, Seong-Wook;Jung, Sun-Min;Zhu, Guomin;De Yoreo, James J;Kim, Guntae;Baek, Jong-Beom;
Journal Journal of the American Chemical Society
Year 2018
DOI
10.1021/jacs.7b10663
URL
Keywords
carbon dioxide methane hydrogen 3d cage-like networks gas uptake

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