Abstract
Development of high performance electrodes for polymer electrolyte membrane fuel cells (PEMFCs) requires fast screening of the catalysts for their catalytic activity and durability by subjecting them to a suitable accelerated stress test (AST). Electrochemical potential cycling in acidic media is one of such frequently used ASTs of platinum nanoparticle-based catalysts. The activity degradation of such catalysts during AST takes place through different mechanisms including particle size growth, dissolution and detachment of catalyst particles, electronic connectivity loss, etc. Here, we present a quantification of these degradation mechanisms with the number of potential cycles (N) during the AST of carbon supported platinum catalyst. Among various mechanisms, the activity degradation due to particle size growth attributed to the Ostwald ripening is found to be the most prominent during the initial part of the AST (N < 500). On the other hand, the loss due to dissolution/detachment varies linearly during the AST cycling. Such understanding of the evolution of degradation mechanisms with N may be utilized effectively towards development of high performance PEMFC electrocatalysts.
| Original language | English |
|---|---|
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 838 |
| Pages (from-to) | 82-88 |
| Number of pages | 7 |
| ISSN | 1572-6657 |
| DOIs | |
| Publication status | Published - 2019 |
Keywords
- Accelerated stress test
- Degradation mechanism
- Evolution
- PEMFC
- Pt nanoparticle
Cite this
}
Evolution of the degradation mechanisms with the number of stress cycles during an accelerated stress test of carbon supported platinum nanoparticles. / Sharma, Raghunandan; Gyergyek, Sašo; Li, Qingfeng; Andersen, Shuang Ma.
In: Journal of Electroanalytical Chemistry, Vol. 838, 2019, p. 82-88.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Evolution of the degradation mechanisms with the number of stress cycles during an accelerated stress test of carbon supported platinum nanoparticles
AU - Sharma, Raghunandan
AU - Gyergyek, Sašo
AU - Li, Qingfeng
AU - Andersen, Shuang Ma
PY - 2019
Y1 - 2019
N2 - Development of high performance electrodes for polymer electrolyte membrane fuel cells (PEMFCs) requires fast screening of the catalysts for their catalytic activity and durability by subjecting them to a suitable accelerated stress test (AST). Electrochemical potential cycling in acidic media is one of such frequently used ASTs of platinum nanoparticle-based catalysts. The activity degradation of such catalysts during AST takes place through different mechanisms including particle size growth, dissolution and detachment of catalyst particles, electronic connectivity loss, etc. Here, we present a quantification of these degradation mechanisms with the number of potential cycles (N) during the AST of carbon supported platinum catalyst. Among various mechanisms, the activity degradation due to particle size growth attributed to the Ostwald ripening is found to be the most prominent during the initial part of the AST (N < 500). On the other hand, the loss due to dissolution/detachment varies linearly during the AST cycling. Such understanding of the evolution of degradation mechanisms with N may be utilized effectively towards development of high performance PEMFC electrocatalysts.
AB - Development of high performance electrodes for polymer electrolyte membrane fuel cells (PEMFCs) requires fast screening of the catalysts for their catalytic activity and durability by subjecting them to a suitable accelerated stress test (AST). Electrochemical potential cycling in acidic media is one of such frequently used ASTs of platinum nanoparticle-based catalysts. The activity degradation of such catalysts during AST takes place through different mechanisms including particle size growth, dissolution and detachment of catalyst particles, electronic connectivity loss, etc. Here, we present a quantification of these degradation mechanisms with the number of potential cycles (N) during the AST of carbon supported platinum catalyst. Among various mechanisms, the activity degradation due to particle size growth attributed to the Ostwald ripening is found to be the most prominent during the initial part of the AST (N < 500). On the other hand, the loss due to dissolution/detachment varies linearly during the AST cycling. Such understanding of the evolution of degradation mechanisms with N may be utilized effectively towards development of high performance PEMFC electrocatalysts.
KW - Accelerated stress test
KW - Degradation mechanism
KW - Evolution
KW - PEMFC
KW - Pt nanoparticle
U2 - 10.1016/j.jelechem.2019.02.052
DO - 10.1016/j.jelechem.2019.02.052
M3 - Journal article
AN - SCOPUS:85062354195
VL - 838
SP - 82
EP - 88
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 1572-6657
ER -