English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/226840
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


Phosphorous incorporation in Pd2Sn alloys for electrocatalytic ethanol oxidation

AuthorsYu, Xiaoting; Liu, Junfeng; Li, Junshan; Luo, ZhiShan; Zuo, Yong; Xing, Congcong; Llorca, Jordi; Nasiou, Déspina; Arbiol, Jordi ; Pan, Kai; Kleinhanns, Tobias; Xie, Ying; Cabot, Andreu
Issue Date2020
CitationNano Energy 77: 105116 (2020)
AbstractDirect ethanol fuel cells (DEFCs) show a huge potential to power future electric vehicles and portable electronics, but their deployment is currently limited by the unavailability of proper electrocatalysis for the ethanol oxidation reaction (EOR). In this work, we engineer a new electrocatalyst by incorporating phosphorous into a palladium-tin alloy and demonstrate a significant performance improvement toward EOR. We first detail a synthetic method to produce Pd2Sn:P nanocrystals that incorporate 35% of phosphorus. These nanoparticles are supported on carbon black and tested for EOR. Pd2Sn:P/C catalysts exhibit mass current densities up to 5.03 A mgPd−1, well above those of Pd2Sn/C, PdP2/C and Pd/C reference catalysts. Furthermore, a twofold lower Tafel slope and a much longer durability are revealed for the Pd2Sn:P/C catalyst compared with Pd/C. The performance improvement is rationalized with the aid of density functional theory (DFT) calculations considering different phosphorous chemical environments. Depending on its oxidation state, surface phosphorus introduces sites with low energy OH− adsorption and/or strongly influences the electronic structure of palladium and tin to facilitate the oxidation of the acetyl to acetic acid, which is considered the EOR rate limiting step. DFT calculations also points out that the durability improvement of Pd2Sn:P/C catalyst is associated to the promotion of OH adsorption that accelerates the oxidation of intermediate poisoning COads, reactivating the catalyst surface.
Publisher version (URL)https://doi.org/10.1016/j.nanoen.2020.105116
Appears in Collections:(CIN2) Artículos
Files in This Item:
File Description SizeFormat 
nanoenergy_a2020v77n105116p-Pre.pdf2,07 MBAdobe PDFThumbnail
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.