Design of PGM-free cathodic catalyst layers for advanced PEM fuel cells

Reshetenko, Tatyana ¹Odgaard, Madeleine ²Randolf, Guenter ³Ohtaki, Kenta K. ¹Bradley, John P. ¹Zulevi, Barr ⁴Lyu, Xiang ⁵Cullen, David A. ⁵Jafta, Charl J. ⁵Serov, Alexey ⁵Kulikovsky, Andrei⁶

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作者信息

1. Univ Hawaii
2. IRD Fuel Cells LLC
3. GRandalytics
4. Pajarito Powder LLC PPC
5. Oak Ridge Natl Lab
6. Forschungszentrum Julich GmbH
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Abstract

The design of cathodic catalysts layer (CCL) consisted of Platinum Group Metal-free (PGM-free) electrocatalysts was done by catalyst coated membrane approach. Three different Fe-Mn-N-C compounds were synthesized with Fe:Mn ratio of 1:1, 2:1 and 2:1 with modified heat treatment profile. The catalysts were characterized by X-ray photoelectron spectroscopy, X-ray powder diffraction, pore and particle size distribution, zeta potential and transmission electron microscopy. Electrocatalysts were integrated into membrane electrode assembly and evaluated by electrochemical methods. Electrochemical impedance spectroscopy in combination with modeling were used for estimation of proton conductivity of CCL and its oxygen diffusivity. It was found that all CCLs possess extremely high proton conductivity, which was demonstrated for the first time for these types of PGMfree catalysts. The observed ORR mechanism was predominantly 4e- due to peroxide/radicals scavenging effect of Mn.

Key words

PEM fuel cell/PGM-free electrode/Proton conductivity/Electron conductivity/Impedance/Modeling/IMPEDANCE SPECTROSCOPY CHARACTERIZATION/METAL-FREE CATALYSTS/ELECTROCHEMICAL IMPEDANCE/OXYGEN-TRANSPORT/MASS-TRANSPORT/ACTIVE-SITES/MODEL/PERFORMANCE/ELECTRODES/CHANNEL

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量15

参考文献量64

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