Stability of Pd3Pb nanocubes during electrocatalytic ethanol oxidation
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10.1021/acs.chemmater.9b05094
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/344001
Tipus de documentArticle
Data publicació2020-02-07
EditorAmerican Chemical Society (ACS)
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Intermetallic Pd3Pb nanocrystals with controlled size and cubic geometry exposing (100) facets are synthesized and tested as electrocatalysts for ethanol oxidation in alkaline media. We observe the ethanol oxidation activity and stability to be size-dependent. The 10 nm Pd3Pb nanocrystals display the highest initial current densities, but after few hundred cycles, the current density of smaller nanocrystals becomes much larger. All of the catalysts exhibit a pronounced current decay during the first 500 s of continuous operation, which is associated with the accumulation of strongly adsorbed reaction intermediates, blocking reaction sites. These adsorbed species can be removed by cycling the catalysts or maintaining them at slightly higher potentials for a short period of time to oxidize and later reduce the Pd surface. Such simple cleaning processes, that can be performed during operation breaks without cell disassembly, is sufficient to effectively remove the poisoning species adsorbed on the surface and recover the electrocatalytic activity.
CitacióYu, X. [et al.]. Stability of Pd3Pb nanocubes during electrocatalytic ethanol oxidation. "Chemistry of materials", 7 Febrer 2020, vol. 32, núm. 5, p. 2044-2052.
ISSN0897-4756
Versió de l'editorhttps://pubs.acs.org/doi/10.1021/acs.chemmater.9b05094
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