Degradation mechanisms of electrochemical activity of Pt/C during the accelerated stress test focused on catalyst support corrosion

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Abstrakt

Accelerated stress test (AST) protocol meant to study the durability of catalyst support (carbon) for the state-of-the-art electrocatalyst used in the polymer electrolyte membrane fuel cells (PEMFCs), i.e., Pt nanoparticles supported on high surface area carbon (Pt/C) has been evaluated critically. For the Pt/C electrocatalysts, the AST meant to study the support durability consists of potentiodynamic treatment, e.g., potential cycling for the potentials > 1.0 V, where the Pt surface is passivated through surface oxides and the corrosion of support carbon is prominent degradation mechanism. We have observed that potential cycling between 1.0 and 1.6 V (vs. RHE) in sulfuric acid or perchloric acid electrolyte causes significant impact on the catalyst particles presumed to be passivated due to formation of oxide layer. X-ray diffraction (XRD) patterns of pre-AST and post-AST samples (Figure 1) suggest significant change in crystallite size during potential cycling between 1.0 and 1.6 V (vs. RHE), which may be considered to growth induced by dissolution/redeposition rather than particle growth through agglomeration due to support corrosion. Based on quantification of the degradation mechanisms,1, 2, significant (~50%) electrochemical surface area loss due to catalyst particle growth during support corrosion AST should be taken into account while development/screening of durable catalyst supports.
OriginalsprogEngelsk
Publikationsdatosep. 2021
StatusUdgivet - sep. 2021
Begivenhed72nd Annual Meeting of the International Society of Electrochemistry - Hybrid Meeting - Jeju Island, Korea/Online, Jeju Island, Nordkorea
Varighed: 29. aug. 20213. sep. 2021
https://annual72.ise-online.org/

Konference

Konference72nd Annual Meeting of the International Society of Electrochemistry
LokationHybrid Meeting - Jeju Island, Korea/Online
Land/OmrådeNordkorea
ByJeju Island
Periode29/08/202103/09/2021
Internetadresse

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