Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/37110 |
Resumo: | Electrochemical reduction of low-conductive hematite-based ceramics represents a novel approach for iron recovery and waste valorisation. The process itself allows a flexible switching between hydrogen generation and iron reduction, important for the intermittent renewable-energy-powered electrolytic process. The present study focuses on the direct electrochemical reduction of aluminium-containing hematite in strong alkaline media. Within this scope, the reduction mechanisms of porous and dense cathodes, with 60%, 37% and 3% of open porosity, were investigated using different types of electrodes configuration: nickel-foil and Ag-modified nickel-foil supported configuration (cathodes facing or against the counter electrode), and nickel-mesh supported configuration. The efficiency of the iron reduction was compared for different electrode concepts. The results highlight the importance of electrolyte access to the interface between the metallic current collector and ceramic cathode for attaining reasonable electroreduction currents. Both excessively porous and dense ceramic cathodes are hardly suitable for such reduction process, showing a necessity to find a compromise between mechanical strength of the electrode and its open porosity, essential for the electrolyte access. |
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Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode designCellular ceramicsHematiteMetallic ironZero-valent ironCathodic reductionElectrochemical reduction of low-conductive hematite-based ceramics represents a novel approach for iron recovery and waste valorisation. The process itself allows a flexible switching between hydrogen generation and iron reduction, important for the intermittent renewable-energy-powered electrolytic process. The present study focuses on the direct electrochemical reduction of aluminium-containing hematite in strong alkaline media. Within this scope, the reduction mechanisms of porous and dense cathodes, with 60%, 37% and 3% of open porosity, were investigated using different types of electrodes configuration: nickel-foil and Ag-modified nickel-foil supported configuration (cathodes facing or against the counter electrode), and nickel-mesh supported configuration. The efficiency of the iron reduction was compared for different electrode concepts. The results highlight the importance of electrolyte access to the interface between the metallic current collector and ceramic cathode for attaining reasonable electroreduction currents. Both excessively porous and dense ceramic cathodes are hardly suitable for such reduction process, showing a necessity to find a compromise between mechanical strength of the electrode and its open porosity, essential for the electrolyte access.Elsevier2023-04-17T12:02:04Z2019-12-10T00:00:00Z2019-12-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/37110eng0013-468610.1016/j.electacta.2019.135060Lopes, Daniela V.Ivanova, Yu. A.Kovalevsky, AndreiSarabando, Artur R.Frade, Jorge R.Quina, Margarida J.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:11:33Zoai:ria.ua.pt:10773/37110Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:07:45.152766Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
title |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
spellingShingle |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design Lopes, Daniela V. Cellular ceramics Hematite Metallic iron Zero-valent iron Cathodic reduction |
title_short |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
title_full |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
title_fullStr |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
title_full_unstemmed |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
title_sort |
Electrochemical reduction of hematite-based ceramics in alkaline medium: challenges in electrode design |
author |
Lopes, Daniela V. |
author_facet |
Lopes, Daniela V. Ivanova, Yu. A. Kovalevsky, Andrei Sarabando, Artur R. Frade, Jorge R. Quina, Margarida J. |
author_role |
author |
author2 |
Ivanova, Yu. A. Kovalevsky, Andrei Sarabando, Artur R. Frade, Jorge R. Quina, Margarida J. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Lopes, Daniela V. Ivanova, Yu. A. Kovalevsky, Andrei Sarabando, Artur R. Frade, Jorge R. Quina, Margarida J. |
dc.subject.por.fl_str_mv |
Cellular ceramics Hematite Metallic iron Zero-valent iron Cathodic reduction |
topic |
Cellular ceramics Hematite Metallic iron Zero-valent iron Cathodic reduction |
description |
Electrochemical reduction of low-conductive hematite-based ceramics represents a novel approach for iron recovery and waste valorisation. The process itself allows a flexible switching between hydrogen generation and iron reduction, important for the intermittent renewable-energy-powered electrolytic process. The present study focuses on the direct electrochemical reduction of aluminium-containing hematite in strong alkaline media. Within this scope, the reduction mechanisms of porous and dense cathodes, with 60%, 37% and 3% of open porosity, were investigated using different types of electrodes configuration: nickel-foil and Ag-modified nickel-foil supported configuration (cathodes facing or against the counter electrode), and nickel-mesh supported configuration. The efficiency of the iron reduction was compared for different electrode concepts. The results highlight the importance of electrolyte access to the interface between the metallic current collector and ceramic cathode for attaining reasonable electroreduction currents. Both excessively porous and dense ceramic cathodes are hardly suitable for such reduction process, showing a necessity to find a compromise between mechanical strength of the electrode and its open porosity, essential for the electrolyte access. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-12-10T00:00:00Z 2019-12-10 2023-04-17T12:02:04Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/37110 |
url |
http://hdl.handle.net/10773/37110 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0013-4686 10.1016/j.electacta.2019.135060 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799137731723395072 |