Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 98-102 |
| Seitenumfang | 5 |
| Fachzeitschrift | Electrochemistry Communications |
| Jahrgang | 82 |
| Frühes Online-Datum | 27 Juli 2017 |
| Publikationsstatus | Veröffentlicht - Sept. 2017 |
Abstract
Oxygen permeation in proton exchange membrane (PEM) water electrolyzers is a critical phenomenon. Mainly, because of (i) degradation and (ii) purity of the hydrogen product gas. Additionally, but less important because of (iii) efficiency loss and (iv) safety problems. Despite these issues, oxygen permeation in PEM water electrolysis was paid less attention. This can be explained by the low oxygen crossover compared to the hydrogen crossover. In this contribution the oxygen content within the hydrogen product gas was measured for two different cathodic catalyst materials (Pt and a Pt-free catalyst) during water electrolysis in a current density range of 0.05–2 A/cm2. In comparison to the platinum catalyst, the Pt-free catalyst leads to 3–4 times higher oxygen contents within the hydrogen product gas. This can be explained with a lower activity concerning oxygen recombination, so that less permeated oxygen is consumed and consequently, the oxygen flux within hydrogen is higher. The results of this work emphasize that the oxygen crossover increases with increasing current density, as like the hydrogen crossover does. Particularly, two effects are possible for this strong increase in oxygen permeation: supersaturation and the electro-osmotic drag. The experimental findings show that the crossover is higher as generally expected, and should receive more attention.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Elektrochemie
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in: Electrochemistry Communications, Jahrgang 82, 09.2017, S. 98-102.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Experimental evidence of increasing oxygen crossover with increasing current density during PEM water electrolysis
AU - Trinke, Patrick
AU - Bensmann, Boris
AU - Hanke-Rauschenbach, Richard
N1 - Funding information: The authors gratefully acknowledge the financial support by the Federal Ministry of Education and Research of Germany in the framework of PowerMEE (project number 03SF0536B).
PY - 2017/9
Y1 - 2017/9
N2 - Oxygen permeation in proton exchange membrane (PEM) water electrolyzers is a critical phenomenon. Mainly, because of (i) degradation and (ii) purity of the hydrogen product gas. Additionally, but less important because of (iii) efficiency loss and (iv) safety problems. Despite these issues, oxygen permeation in PEM water electrolysis was paid less attention. This can be explained by the low oxygen crossover compared to the hydrogen crossover. In this contribution the oxygen content within the hydrogen product gas was measured for two different cathodic catalyst materials (Pt and a Pt-free catalyst) during water electrolysis in a current density range of 0.05–2 A/cm2. In comparison to the platinum catalyst, the Pt-free catalyst leads to 3–4 times higher oxygen contents within the hydrogen product gas. This can be explained with a lower activity concerning oxygen recombination, so that less permeated oxygen is consumed and consequently, the oxygen flux within hydrogen is higher. The results of this work emphasize that the oxygen crossover increases with increasing current density, as like the hydrogen crossover does. Particularly, two effects are possible for this strong increase in oxygen permeation: supersaturation and the electro-osmotic drag. The experimental findings show that the crossover is higher as generally expected, and should receive more attention.
AB - Oxygen permeation in proton exchange membrane (PEM) water electrolyzers is a critical phenomenon. Mainly, because of (i) degradation and (ii) purity of the hydrogen product gas. Additionally, but less important because of (iii) efficiency loss and (iv) safety problems. Despite these issues, oxygen permeation in PEM water electrolysis was paid less attention. This can be explained by the low oxygen crossover compared to the hydrogen crossover. In this contribution the oxygen content within the hydrogen product gas was measured for two different cathodic catalyst materials (Pt and a Pt-free catalyst) during water electrolysis in a current density range of 0.05–2 A/cm2. In comparison to the platinum catalyst, the Pt-free catalyst leads to 3–4 times higher oxygen contents within the hydrogen product gas. This can be explained with a lower activity concerning oxygen recombination, so that less permeated oxygen is consumed and consequently, the oxygen flux within hydrogen is higher. The results of this work emphasize that the oxygen crossover increases with increasing current density, as like the hydrogen crossover does. Particularly, two effects are possible for this strong increase in oxygen permeation: supersaturation and the electro-osmotic drag. The experimental findings show that the crossover is higher as generally expected, and should receive more attention.
KW - Current density
KW - Oxygen crossover
KW - PEM
KW - Permeation
KW - Supersaturation
KW - Water electrolysis
UR - http://www.scopus.com/inward/record.url?scp=85026786460&partnerID=8YFLogxK
U2 - 10.1016/j.elecom.2017.07.018
DO - 10.1016/j.elecom.2017.07.018
M3 - Article
AN - SCOPUS:85026786460
VL - 82
SP - 98
EP - 102
JO - Electrochemistry Communications
JF - Electrochemistry Communications
SN - 1388-2481
ER -