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Title: MOF-Derived Carbon Networks with Atomically Dispersed Fe-N<inf>x</inf> Sites for Oxygen Reduction Reaction Catalysis in Acidic Media
Authors: Qian, Y
Liu, Q
Sarnello, E
Tang, C
Shui, J
Li, T
Pennycook, SJ
Han, M
Zhao Dan 
Issue Date: 1-Jul-2019
Publisher: American Chemical Society (ACS)
Citation: Qian, Y, Liu, Q, Sarnello, E, Tang, C, CHNG MEI LIN (ZHUANG MEILIN), Shui, J, Li, T, Pennycook, SJ, Han, M, Zhao Dan (2019-07-01). MOF-Derived Carbon Networks with Atomically Dispersed Fe-Nx Sites for Oxygen Reduction Reaction Catalysis in Acidic Media. ACS Materials Letters 1 (1) : 37-43. ScholarBank@NUS Repository.
Abstract: © 2019 American Chemical Society. Proton exchange membrane fuel cell (PEMFC) is one of the most promising candidates for electrochemical energy conversion, but the requirement of expensive Pt-based catalysts on the cathodes prevents its large-scale application. Herein, we report the preparation of three-dimensional carbon networks with atomically dispersed Fe-N4 active sites (SA-3DNC) for oxygen reduction reaction (ORR) catalysis in the cathodes of PEMFCs. Derived from NaCl-assisted pyrolysis, the SA-3DNC has a continuous, micro-macroporous hierarchical morphology which is endowed by the modulator effect of the molten salt. In 0.1 M HClO4, the SA-3DNC has a 0.906 V onset potential for ORR, which is 30 mV more positive than that of commercial 20% Pt/C. After 10 »000 cycles of accelerated degradation, the half-wave potential of SA-3DNC only drops 38 mV, compared to 125 mV of the Pt/C. Furthermore, a single cell was assembled using the SA-3DNC as the cathodic catalyst, showing only a 20% current drop after a 20-h durability test at 0.5 V. Our study has demonstrated a facile way to prepare hierarchical, stable, and noble-metal-free electrocatalysts with atomically dispersed active sites for ORR catalysis in acidic media.
Source Title: ACS Materials Letters
ISSN: 2639-4979
DOI: 10.1021/acsmaterialslett.9b00052
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