Experimental and Model-based Investigation of Overpotentials During Oxygen Reduction Reaction in Silver-based Gas-diffusion Electrodes
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| Title: | Experimental and Model-based Investigation of Overpotentials During Oxygen Reduction Reaction in Silver-based Gas-diffusion Electrodes |
|---|---|
| Description: | Chlorine is one of the most important basic chemicals, which is used directly or indirectly in the production of around 60% of all chemical products. The production is almost exclusively based on energy intensive electrolysis processes, with an average of 2.5 - 3.5 MWh of electrical energy required per ton of chlorine generated. This means that chlorine production alone accounts for around 3% of the electrical energy used worldwide in industry. By using oxygen depolarized cathodes (ODC), it is possible to reduce the demand for electrical energy on an industrial scale by about 25%. Instead of hydrogen evolution, oxygen reduction takes place. Due to the low solubility of oxygen, the electrode is designed as a gas-diffusion electrodes (GDE). These are porous silver-based electrodes with hydrophobic regions due to the use of polytetrafluoroethylene (PTFE). During operation, the liquid electrolyte penetrates the pore structure, but the PTFE prevents complete flooding of the electrode. Oxygen is supplied via a gas compartment and enters the internal structure of the electrode. A three-phase interface is formed, consisting of liquid electrolyte, gas and catalytically active solid, at which the electrochemical reaction takes place. Although the technology is already successfully used industrially, many processes, especially the electrolyte distribution, inside the GDE remain unknown. In this dissertation, the influence of PTFE is first systematically investigated. Subsequently the process is described in a pseudo-2D model supported by operando experiments. Finally, the exact penetration depth of the electrolyte is analyzed using specially designed electrodes. |
| Authors: | Franzen, David |
| Resource Type: | eBook. |
| Subjects: | Gas distribution |
| Categories: | SCIENCE / Chemistry / Electrochemistry, SCIENCE / Experiments & Projects, TECHNOLOGY & ENGINEERING / Power Resources / Electrical |
| Database: | eBook Collection (EBSCOhost) |
| FullText | Links: – Type: ebook-pdf Text: Availability: 0 |
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| Header | DbId: nlebk DbLabel: eBook Collection (EBSCOhost) An: 3078598 RelevancyScore: 1103 AccessLevel: 6 PubType: eBook PubTypeId: ebook PreciseRelevancyScore: 1103.19409179688 |
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| Items | – Name: Title Label: Title Group: Ti Data: Experimental and Model-based Investigation of Overpotentials During Oxygen Reduction Reaction in Silver-based Gas-diffusion Electrodes – Name: Abstract Label: Description Group: Ab Data: Chlorine is one of the most important basic chemicals, which is used directly or indirectly in the production of around 60% of all chemical products. The production is almost exclusively based on energy intensive electrolysis processes, with an average of 2.5 - 3.5 MWh of electrical energy required per ton of chlorine generated. This means that chlorine production alone accounts for around 3% of the electrical energy used worldwide in industry. By using oxygen depolarized cathodes (ODC), it is possible to reduce the demand for electrical energy on an industrial scale by about 25%. Instead of hydrogen evolution, oxygen reduction takes place. Due to the low solubility of oxygen, the electrode is designed as a gas-diffusion electrodes (GDE). These are porous silver-based electrodes with hydrophobic regions due to the use of polytetrafluoroethylene (PTFE). During operation, the liquid electrolyte penetrates the pore structure, but the PTFE prevents complete flooding of the electrode. Oxygen is supplied via a gas compartment and enters the internal structure of the electrode. A three-phase interface is formed, consisting of liquid electrolyte, gas and catalytically active solid, at which the electrochemical reaction takes place. Although the technology is already successfully used industrially, many processes, especially the electrolyte distribution, inside the GDE remain unknown. In this dissertation, the influence of PTFE is first systematically investigated. Subsequently the process is described in a pseudo-2D model supported by operando experiments. Finally, the exact penetration depth of the electrolyte is analyzed using specially designed electrodes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Franzen%2C+David%22">Franzen, David</searchLink> – Name: TypePub Label: Resource Type Group: TypPub Data: eBook. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Gas+distribution%22">Gas distribution</searchLink> – Name: SubjectBISAC Label: Categories Group: Su Data: <searchLink fieldCode="ZK" term="%22SCIENCE+%2F+Chemistry+%2F+Electrochemistry%22">SCIENCE / Chemistry / Electrochemistry</searchLink><br /><searchLink fieldCode="ZK" term="%22SCIENCE+%2F+Experiments+%26+Projects%22">SCIENCE / Experiments & Projects</searchLink><br /><searchLink fieldCode="ZK" term="%22TECHNOLOGY+%26+ENGINEERING+%2F+Power+Resources+%2F+Electrical%22">TECHNOLOGY & ENGINEERING / Power Resources / Electrical</searchLink> |
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| RecordInfo | BibRecord: BibEntity: Classifications: – Code: 665.74 Scheme: ddc Type: prePub Languages: – Code: eng Text: English Subjects: – SubjectFull: Gas distribution Type: general Titles: – TitleFull: Experimental and Model-based Investigation of Overpotentials During Oxygen Reduction Reaction in Silver-based Gas-diffusion Electrodes Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Franzen, David – PersonEntity: Name: NameFull: Franzen, David IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Type: published Y: 2021 – D: 06 M: 05 Type: profile Y: 2023 Identifiers: – Type: isbn-print Value: 9783736975149 – Type: isbn-electronic Value: 9783736965140 Titles: – TitleFull: Experimental and Model-based Investigation of Overpotentials During Oxygen Reduction Reaction in Silver-based Gas-diffusion Electrodes Type: main |
| ResultId | 1 |
