Journal
CHEMISTRY OF MATERIALS
Volume 32, Issue 5, Pages 2044-2052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b05094
Keywords
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Funding
- European Regional Development Funds
- Spanish Ministerio de Economia y Competitividad [ENE2016-77798-C4-3-R, ENE2017-8S087-C3]
- China Scholarship Council
- Generalitat de Catalunya [2017 SGR 327, 2017 SGR 1246]
- Severo Ochoa Programme (MINECO) [SEV-2017-0706]
- CERCA Programme/Generalitat de Catalunya
- MINECO/FEDER [RTI2018-093996-B-C31, GC 2017 SGR 128]
- CSC-UAB PhD scholarship program
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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.
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