J. Electrochem. Sci. Eng.  

Methanol oxidation at platinized copper particles prepared by galvanic replacement

Ioanna Mintsouli, Jenia Georgieva, Athanasios Papaderakis, Stephan Armyanov, Eugenia Valova, Volodymyr Khomenko, Stella Balomenou, Dimitrios Tsiplakides, Sotiris Sotiropoulos

Abstract


Bimetallic Pt-Cu particles have been prepared by galvanic replacement of Cu precursor nanoparticles, upon the treatment of the latter with a chloro-platinate acidic solution. The resulting particles, typically a few tens of nm large, were supported on high surface area carbon (Vulcan® XC–72R, Cabot) and tested as electrodes. Surface electrochemistry in deaerated acid solutions was similar to that of pure Pt, indicating the existence of a Pt shell (hence the particles are denoted as Pt(Cu)). Pt(Cu)/C supported catalysts exhibit superior carbon monoxide and methanol oxidation activity with respect to their Pt/C analogues when compared on a per electroactive surface area basis, due to the modification of Pt activity by Cu residing in the particle core. However, as a result of large particle size and agglomeration phenomena, Pt(Cu)/C are still inferior to Pt/C when compared on a mass specific activity basis.


Keywords


ransmetalation; Electrocatalysts; Platinum

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DOI: http://dx.doi.org/10.5599/jese.239



jESE : : Open Access Journal  :  : ISSN 1847-9286