Proton exchange membrane fuel cells (PEMFCs) are hindered by their poor tolerance to CO and HS poisoning. Herein, we report an effective method, via engineering 2,6-dihydroxymethyl pyridine (DhmPy) molecule blocking layers on Pt surface, aiming to save the poisoning issue for PEMFC anode reaction. The PEMFCs assembled by this catalyst produce a power density of 1.18 W cm @ 2.0 A cm and 1.32 W cm @ 2.0 A cm, far exceeding commercial Pt/C after H/10 ppm CO poisoning and H/5 ppm HS poisoning tests, respectively. Density functional theory (DFT) indicates that a coronal molecule layer with a steric confinement height (1.82 Å), constructed by DhmPy, emerges more intensive adsorption energy compared to 2,6-pyridinedicarboxamide (DcaPy) and 2,6-diacetylpyridine (DAcPy), thereby more effectively inhibits the adsorption of large-sized CO and HS on Pt surface without affecting H traverse. This "work along both lines" mechanism with the resistance of both CO and HS provides a new and promising design thought for high CO and sulfur tolerant PEMFC anodes.
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| http://dx.doi.org/10.1016/j.jcis.2023.09.076 | DOI Listing |
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