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  PtRu nanoparticles supported on noble carbons for ethanol electrooxidation

Rodríguez-Gómez, A., Lepre, E., Sánchez-Silva, L., Lopez Salas, N., & de la Osa, A. R. (2022). PtRu nanoparticles supported on noble carbons for ethanol electrooxidation. Journal of Energy Chemistry, 66, 168-180. doi:10.1016/j.jechem.2021.07.004.

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 Creators:
Rodríguez-Gómez, Alberto, Author
Lepre, Enrico1, Author           
Sánchez-Silva, Luz, Author
Lopez Salas, Nieves1, Author           
de la Osa, Ana Raquel, Author
Affiliations:
1Nieves Lopez Salas, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3029702              

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Free keywords: Noble carbon, Cytosine, H production, Ethanol electrooxidation, PtRu anode, PEM cell
 Abstract: In this work, three cytosine derived nitrogen doped carbonaceous materials (noble carbons, NCs) with different atomic C/N ratios and porous networks have been synthesized and used as supports for PtRu electrocatalysts in the ethanol oxidation reaction (EOR) for clean hydrogen production. Both, the metal phase and the carbon support play critical roles in the electrocatalysts final performance. Lower NPs size distribution was obtained over supports with low atomic C/N ratios (i.e., 4 and 6) and defined porosity (i.e., 1701 m2 g−1 for PtRu/CNZ and 1834 m2 g−1 for PtRu/CLZ, respectively). In contrast, a lower C/N ratio and poor porous network (i.e., 65 m2 g−1, PtRu/CLK) led to the largest particle size and fostered an increase of the alloying degree between Pt and Ru NPs (i.e., 3 for C/N ~ 6 and 28 for C/N ~ 3). Electrochemical active surface area was found to increase with decreasing NPs size and the alloy extent, due to a higher availability of Pt active sites. Accelerated degradation tests showed that PtRu/NCs outperform similar to PtRu NPs on commercial carbon pointing at the stabilizing effect of NCs. PtRu/CNZ exhibited the best electrochemical performance (i.e., 69.1 mA mgPt−1), outperforming PtRu/CLZ and PtRu/CLK by 3- and 9-fold, respectively, due to a suitable compromise between particle sizes, degree of alloy, textural properties and elemental composition. Best anodes were scaled-up to a proton exchange membrane cell and PtRu/CNZ was proved to provide the best electrocatalytic activity (262 mA cm−2 and low energy requirements), matching the values obtained by the state of the art of EOR electrocatalysts.

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Language(s): eng - English
 Dates: 2021-07-162022
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jechem.2021.07.004
BibTex Citekey: RODRIGUEZGOMEZ2022168
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Title: Journal of Energy Chemistry
  Abbreviation : J. Energy Chem.
Source Genre: Journal
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Publ. Info: Amsterdam, The Netherlands : Elsevier BV
Pages: - Volume / Issue: 66 Sequence Number: - Start / End Page: 168 - 180 Identifier: ISSN: 20954956