Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 164, Issue 4, Pages F224-F228Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0291704jes
Keywords
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Funding
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT, & Future Planning [NRF-2015M1A2A2056690, NRF-2015M1A2A2056554]
- KIST Institutional Program [2V04940, 2E26580]
- Korean Government through the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - MOTIE [20133030011320]
- Global Frontier R&D Program on Center for Multiscale Energy System - National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [2016M3A6A7945505]
- National Research Foundation of Korea [2015M1A2A2056690, 2015M1A2A2056555, 2016M3A6A7945505] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2017 The Electrochemical Society. All rights reserved.
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