Urchin-Shaped Hollow Iron-Nitrogen-Doped Carbon Microspheres as High-Performance Electrocatalysts for Oxygen Reduction
- Urchin-Shaped Hollow Iron-Nitrogen-Doped Carbon Microspheres as High-Performance Electrocatalysts for Oxygen Reduction
- 남석우; 권석준; 김형준; 장종현; 유성종; 김진영; 박현서; 박민정
- Issue Date
- Journal of the Electrochemical Society
- VOL 164, NO 4-F228
- Oxygen reduction reaction (ORR) kinetics are enhanced in alkaline media. Hence, alternative non-platinum (Pt)-group metal electrocatalysts have been investigated extensively in this medium to compete with Pt in terms of performance and durability. Among various non-Pt catalysts, one of the most popular class of electrocatalysts is iron-and nitrogen-doped carbon-based (Fe-N-C) by the high electrocatalytic activity and selectivity in ORR. However, the inherent catalytic reactivity of such non-Pt electrocatalysts remains inferior to that of state-of-the-art Pt electrocatalysts. Here, we explore the ORR of hollow and urchin-like, three-dimensional (3D) nanostructured Fe-N-Cs prepared via polymerization-induced self-assembly of aniline followed by carbonization. The resulting Fe-N-Cs consist of a hollow microsphere framework coupled with nanorod bundles, and exhibit large surface areas (874 m(2)g(-1)), hierarchical cavities, and excellent electrical conductivities (0.63 Scm(-1)) as electrodes. They are of particular interest as oxygen reduction electrocatalyst for proton exchange membrane fuel cells (PEMFCs). These unique features, which enhance electrocatalytic efficiency, are attributed to efficient mass-and electro-transport ORR kinetics. Electrochemical experiments reveal improved onset (ca. 1.04 V) and half-wave potentials (ca. 0.9 V), which is comparable to those of commercial Pt electrocatalysts. The 3D hierarchical porous network with high interdigitation of well-dispersed nanorod building blocks is thought to be key to facilitating the ORR reaction.
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