Enhancing performance of PEM fuel cells: Using the Au nanoplatelet/Nafion interface to enable CO oxidation under ambient conditions

Journal Article · Sat Apr 16 00:00:00 EDT 2016 · Journal of Catalysis

DOI:https://doi.org/10.1016/j.jcat.2016.03.031· OSTI ID:1336109

Li, Hongfei ^[1]; Pan, Cheng ^[1]; Zhao, Sijia ^[1]; Liu, Ping ^[2]; Zhu, Yimei ^[3]; Rafailovich, Miriam H. ^[1]

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1. State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. of Materials Science and Engineering
2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
3. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science

We developed a method for fabrication of Au nanoparticle platelets which can be coated onto the Nafion membranes of polymer electrolyte membrane (PEM) fuel cells simply by Langmuir–Blodgett (LB) trough lift off from the air water interface. By incorporating the coated membranes into fuel cells with one membrane electrode assembly (MEA) we enhanced the maximum power output by more than 50% when operated under ambient conditions. An enhancement of more than 200% was observed when 0.1% CO was incorporated into the H₂ input gas stream and minimal enhancement was observed when the PEM fuel cell was operated with 100% O₂ gas at the cathode, or when particles were deposited on the electrodes. Density function theory (DFT) calculations were carried out to understand the origin of improved output power. Au NPs with 3-atomic layer in height and 2 nm in size were constructed to model the experimentally synthesized Au NPs. Our results indicated that the Au NPs interacted synergistically with the SO₃ groups, attached at end of Nafion side chains, to reduce the energy barrier for the oxidation of CO occurring at the perimeter of the Au NPs, from 1.292 eV to 0.518 eV, enabling the reaction to occur at T<300 K.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC00112704; SC-00112704; NYSERDA29750
• OSTI ID: 1336109
• Alternate ID(s): OSTI ID: 1341149
• Report Number(s): BNL-112555-2016-JA; R&D Project: CO009; KC0302010
• Journal Information: Journal of Catalysis, Vol. 339, Issue C; ISSN 0021-9517
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
PEM fuel cell
Gold nanoplatelets
CO oxidation