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14 results on '"Abbas, Dunia"'

7. Electrochemical- and mechanical stability of catalyst layers in anion exchange membrane water electrolysis

Author

Mayerhöfer, Britta, Speck, Florian D., Hegelheimer, Manuel, Bierling, Markus, Abbas, Dunia, McLaughlin, David, Cherevko, Serhiy, Thiele, Simon, and Peach, Retha

Subjects
ddc:620
Abstract

Anion exchange membrane (AEM) water electrolysis is considered a promising solution to future cost reduction of electrochemically produced hydrogen. We present an AEM water electrolyzer with CuCoOx as the anode catalyst and Aemion as membrane and electrode binder. Full cell experiments in pure water and 0.1 M KOH revealed that the optimum binder content depended on the type of electrolyte employed. Online dissolution measurements suggested that Aemion alone was not sufficient to establish an alkaline environment for thermodynamically stabilizing the synthesized CuCoOx in a neutral electrolyte feed. A feed of base is thus indispensable to ensure the thermodynamic stability of such non-noble catalyst materials. Particle loss and delamination of the catalyst layer during MEA operation could be reduced by employing a heat treatment step after electrode fabrication. This work summarizes possible degradation pathways for low-cost anodes in AEMWE, and mitigation strategies for enhanced system durability and performance.

Published
2022

10. Communication - Proving the Importance of Pt-Interlayer Position in PEMWE Membranes for the Effective Reduction of the Anodic Hydrogen Content

Author

Martin, Agate, Abbas, Dunia, Trinke, Patrick, Böhm, Thomas, Bierling, Markus, Bensmann, Boris, Thiele, Simon, and Hanke-Rauschenbach, Richard

Subjects
Hydrogen contents, Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie, Performance loss, Dewey Decimal Classification::600 | Technik::660 | Technische Chemie, Oxygen content, Proton exchange membranes, Water electrolyser, Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau, Proton exchange membrane fuel cells (PEMFC), ddc:540, ddc:660, Interlayer position, % reductions, ddc:620, Anodes, Hydrogen
Abstract

Gas crossover through the membrane poses a significant challenge to proton exchange membrane water electrolysers. This work investigates the influence of the position of platinum-based recombination interlayers integrated in the membrane on the anodic hydrogen in oxygen content. The results show that all interlayer positions reduce the anodic hydrogen content without performance losses compared to the reference without interlayer. However, an interlayer positioned closer to the anode is more effective than closer to the cathode. Further, the effect of the interlayer is more pronounced with increasing anode pressure. © 2021 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

Published
2021
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14. Investigation of Iridium-Based OER Catalyst Layers in a GDE Half-Cell Setup: Opportunities and Challenges

Author

Geuß, Moritz, Milosevic, Maja, Bierling, Markus, Löttert, Lukas, Abbas, Dunia, Escalera-López, Daniel, Lloret, Vicent, Ehelebe, Konrad, Mayrhofer, Karl J. J., Thiele, Simon, and Cherevko, Serhiy

Abstract

To achieve widespread commercialization of proton exchange membrane (PEM) water electrolyzers, the optimization of iridium (Ir) utilization is crucial. Traditional full-cell-based approaches are time-consuming and labor-intensive. In this work, the feasibility of using a gas diffusion electrode (GDE) half-cell as an alternative to full-cell setups for accelerated investigation of Ir-oxide-containing anode catalyst layers (CLs) is scrutinized. Using CLs composed of Ir oxides of different intrinsic oxygen evolution reaction (OER) activity as a probe, we show that a GDE can successfully reveal the differences in the performance of the CLs. Comparison of the results obtained in the GDE to those from rotating disk electrode (RDE) and full-cell membrane electrode assembly (MEA) measurements indicate that GDE data can closely mimic both setups. However, essential discrepancies are observed between GDE and MEA, which are linked to differences in the catalyst layer | membrane interface and the presence of liquid electrolyte in the GDE setup. Our findings reveal that even though the direct comparison of the OER performance to full-cell measurements is still partially hampered, GDE half-cell setups can already be used for fundamental assessments and accelerated screening of electrocatalysts and CLs at relevant current densities up to 1.5 A cm−2.

Published
2023
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