New Insight into Platinum Dissolution from Nanoparticulate Platinum-Based Electrocatalysts Using Highly Sensitive In Situ Concentration Measurements

Time‐ and potential‐resolved electrochemical Pt dissolution from commercial Pt and prepared PtCu alloy nanoparticulate catalysts have been studied under potentiodynamic conditions in 0.1 M HClO4 by using on‐line inductively coupled plasma mass spectrometry (ICP‐MS). For the first time the exact amou...

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Bibliographic Details
Published in:ChemCatChem 2014-02, Vol.6 (2), p.449-453
Main Authors: Jovanovič, Primož, Pavlišič, Andraž, Šelih, Vid Simon, Šala, Martin, Hodnik, Nejc, Bele, Marjan, Hočevar, Samo, Gaberšček, Miran
Format: Article
Language:English
Subjects:
cyclic voltammetry
electrochemistry
fuel cells
nanoparticles
platinum
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Summary:Time‐ and potential‐resolved electrochemical Pt dissolution from commercial Pt and prepared PtCu alloy nanoparticulate catalysts have been studied under potentiodynamic conditions in 0.1 M HClO4 by using on‐line inductively coupled plasma mass spectrometry (ICP‐MS). For the first time the exact amount of dissolved Pt per cycle has been measured on real electrocatalysts. Results show clearly that Pt dissolution depends on the particle size: approximately seven times as much Pt is released into the solution from commercial 3 nm Pt particles as from a commercial 30 nm Pt sample. The stability of our prepared PtCu electrocatalyst is higher than that of a commercial 3 nm electrocatalyst, which is, however, still slightly lower than that of a commercial 30 nm Pt electrocatalyst. Platinum away: For the first time the exact amount of dissolved Pt per cycle is measured on real Pt (proton exchange membrane fuel cell) electrocatalysts by using a new electrochemical flow cell coupled with inductively coupled plasma mass spectrometry. We also reveal that Pt corrosion depends markedly on the particle size.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.201300936