Publication
Title
Surface and electrochemical characterisation of a Pt-Cu/C nano-structured electrocatalyst, prepared by galvanic displacement
Author
Abstract
A two-step procedure at room temperature was applied to prepare a bimetallic Pt-Cu carbon-supported catalyst (Pt-Cu/C). First the chemical reduction of Cu ions by sodium borohydride in the presence of Vulcan XC72R carbon powder is performed. Second, the partial galvanic replacement of Cu particle layers by Pt is achieved upon immersion in a chloroplatinate solution. The characterisation of the Pt-Cu/C catalyst by XRD and XPS proves the formation of Pt-Cu alloying. The electrochemical active surface area (EASA) is determined for the Pt-Cu/C transmetalation catalyst as well as for a commercial Pt/C catalyst from the Alfa Aesar HiSpec® product line. The resemblance in surface voltammetry is an indication for a Pt rich shell. The catalytic activity towards the oxygen reduction reaction for both catalysts is evaluated by using linear sweep voltammetry (LSV) in combination with a rotating disc electrode. KoutechýLevich analysis shows that the Pt-Cu/C catalyst has a higher catalytic activity towards the oxygen reduction reaction (ORR) at 0.8 V and 0.85 V vs RHE compared to the tested commercial catalyst. The activity increase is attributed to a ligand effect-modification of the core metal on the Pt shell.
Language
English
Source (journal)
Applied catalysis : B : environmental. - Amsterdam
Publication
Amsterdam : 2014
ISSN
0926-3373
Volume/pages
150(2014), p. 249-256
ISI
000332803700027
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 06.02.2014
Last edited 03.11.2017
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