Over-faradaic hydrogen production in methanol electrolysis cells

A new alcohol electrolyser concept (Methanol Over-Faradaic Electrolyser: MOFE) has been developed to achieve over-faradaic H2 production rates, which were experimentally measured. In a first stage, this outstanding phenomenon was investigated in an alkaline membrane electrolyser. Secondly, a membran...

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Autores: Ruiz López, Estela, Caravaca, Angel, Vernoux, Philippe, Dorado Fernández, Fernando, Consuegra, Antonio de Lucas
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/29829
Acceso en línea:https://hdl.handle.net/10578/29829
Access Level:acceso abierto
Palabra clave:Over-faradaic hydrogen production
Alcohol electrolysis
Electrochemical Promotion of Catalysis (EPOC)
Electrolysis
Electrochemical reforming
Methanol electro-oxidation
Producción de hidrógeno sobrefaradaico
Electrólisis de alcohol
Promoción Electroquímica de Catálisis (EPOC)
Electrólisis
Reformado electroquímico
Electro-oxidación de metanol
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oai_identifier_str oai:ruidera.uclm.es:10578/29829
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Over-faradaic hydrogen production in methanol electrolysis cells
title Over-faradaic hydrogen production in methanol electrolysis cells
spellingShingle Over-faradaic hydrogen production in methanol electrolysis cells
Ruiz López, Estela
Over-faradaic hydrogen production
Alcohol electrolysis
Electrochemical Promotion of Catalysis (EPOC)
Electrolysis
Electrochemical reforming
Methanol electro-oxidation
Producción de hidrógeno sobrefaradaico
Electrólisis de alcohol
Promoción Electroquímica de Catálisis (EPOC)
Electrólisis
Reformado electroquímico
Electro-oxidación de metanol
title_short Over-faradaic hydrogen production in methanol electrolysis cells
title_full Over-faradaic hydrogen production in methanol electrolysis cells
title_fullStr Over-faradaic hydrogen production in methanol electrolysis cells
title_full_unstemmed Over-faradaic hydrogen production in methanol electrolysis cells
title_sort Over-faradaic hydrogen production in methanol electrolysis cells
dc.creator.none.fl_str_mv Ruiz López, Estela
Caravaca, Angel
Vernoux, Philippe
Dorado Fernández, Fernando
Consuegra, Antonio de Lucas
author Ruiz López, Estela
author_facet Ruiz López, Estela
Caravaca, Angel
Vernoux, Philippe
Dorado Fernández, Fernando
Consuegra, Antonio de Lucas
author_role author
author2 Caravaca, Angel
Vernoux, Philippe
Dorado Fernández, Fernando
Consuegra, Antonio de Lucas
author2_role author
author
author
author
dc.subject.none.fl_str_mv Over-faradaic hydrogen production
Alcohol electrolysis
Electrochemical Promotion of Catalysis (EPOC)
Electrolysis
Electrochemical reforming
Methanol electro-oxidation
Producción de hidrógeno sobrefaradaico
Electrólisis de alcohol
Promoción Electroquímica de Catálisis (EPOC)
Electrólisis
Reformado electroquímico
Electro-oxidación de metanol
topic Over-faradaic hydrogen production
Alcohol electrolysis
Electrochemical Promotion of Catalysis (EPOC)
Electrolysis
Electrochemical reforming
Methanol electro-oxidation
Producción de hidrógeno sobrefaradaico
Electrólisis de alcohol
Promoción Electroquímica de Catálisis (EPOC)
Electrólisis
Reformado electroquímico
Electro-oxidación de metanol
description A new alcohol electrolyser concept (Methanol Over-Faradaic Electrolyser: MOFE) has been developed to achieve over-faradaic H2 production rates, which were experimentally measured. In a first stage, this outstanding phenomenon was investigated in an alkaline membrane electrolyser. Secondly, a membrane-less electrolyser was used to simplify and implement this concept in practical configurations. The obtained results demonstrated that the experimentally measured over-faradaic H2 production rates on the cathode were due to the coupling of the electrocatalytic hydrogen production via methanol electrolysis (hydrogen evolution reaction) with the catalytic methanol dehydrogenation reaction. The kinetic of the latter reaction is drastically enhanced upon polarization due to the phenomenon of Electrochemical Promotion of Catalysis (EPOC), in liquid phase conditions. Hence, the K+ ions supplied to the Pd/C catalyst-cathode from the liquid electrolyte under polarization conditions promote the chemisorption of intermediate species, activating the catalytic hydrogen production via methanol dehydrogenation reaction on the active Pd sites. Thus, the synergy between these two processes (electrocatalytic + catalytic) lowers the overall energy requirements of the hydrogen produced below the typical values found for conventional alcohol electrolysis cells. These results demonstrate, for the first time, the possibility to produce an “over-faradaic” H2 production rate in a liquid phase electrolysis cell, which is of great interest in view of enhancing the energetic efficiency and the power requirements for hydrogen production via electrolysis of organic molecules.
publishDate 2020
dc.date.none.fl_str_mv 2020
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10578/29829
url https://hdl.handle.net/10578/29829
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869402712046567424
spelling Over-faradaic hydrogen production in methanol electrolysis cellsRuiz López, EstelaCaravaca, AngelVernoux, PhilippeDorado Fernández, FernandoConsuegra, Antonio de LucasOver-faradaic hydrogen productionAlcohol electrolysisElectrochemical Promotion of Catalysis (EPOC)ElectrolysisElectrochemical reformingMethanol electro-oxidationProducción de hidrógeno sobrefaradaicoElectrólisis de alcoholPromoción Electroquímica de Catálisis (EPOC)ElectrólisisReformado electroquímicoElectro-oxidación de metanolA new alcohol electrolyser concept (Methanol Over-Faradaic Electrolyser: MOFE) has been developed to achieve over-faradaic H2 production rates, which were experimentally measured. In a first stage, this outstanding phenomenon was investigated in an alkaline membrane electrolyser. Secondly, a membrane-less electrolyser was used to simplify and implement this concept in practical configurations. The obtained results demonstrated that the experimentally measured over-faradaic H2 production rates on the cathode were due to the coupling of the electrocatalytic hydrogen production via methanol electrolysis (hydrogen evolution reaction) with the catalytic methanol dehydrogenation reaction. The kinetic of the latter reaction is drastically enhanced upon polarization due to the phenomenon of Electrochemical Promotion of Catalysis (EPOC), in liquid phase conditions. Hence, the K+ ions supplied to the Pd/C catalyst-cathode from the liquid electrolyte under polarization conditions promote the chemisorption of intermediate species, activating the catalytic hydrogen production via methanol dehydrogenation reaction on the active Pd sites. Thus, the synergy between these two processes (electrocatalytic + catalytic) lowers the overall energy requirements of the hydrogen produced below the typical values found for conventional alcohol electrolysis cells. These results demonstrate, for the first time, the possibility to produce an “over-faradaic” H2 production rate in a liquid phase electrolysis cell, which is of great interest in view of enhancing the energetic efficiency and the power requirements for hydrogen production via electrolysis of organic molecules.Se ha desarrollado un nuevo concepto de electrolizador de alcohol (Electrolizador sobre faradaico de metanol: MOFE) para lograr tasas de producción de H 2 sobre faradaicas , que se midieron experimentalmente. En una primera etapa se investigó este destacado fenómeno en un electrolizador de membrana alcalina. En segundo lugar, se utilizó un electrolizador sin membrana para simplificar e implementar este concepto en configuraciones prácticas. Los resultados obtenidos demostraron que el H 2 sobrefaradaico medido experimentalmentelas tasas de producción en el cátodo se debieron al acoplamiento de la producción electrocatalítica de hidrógeno a través de la electrólisis de metanol (reacción de evolución de hidrógeno) con la reacción catalítica de deshidrogenación de metanol. La cinética de esta última reacción mejora drásticamente con la polarización debido al fenómeno de Promoción Electroquímica de Catálisis (EPOC), en condiciones de fase líquida. Por lo tanto, el K +Los iones suministrados al cátodo de catalizador de Pd/C desde el electrolito líquido en condiciones de polarización promueven la quimisorción de especies intermedias, activando la producción catalítica de hidrógeno a través de la reacción de deshidrogenación de metanol en los sitios activos de Pd. Así, la sinergia entre estos dos procesos (electrocatalítico + catalítico) reduce los requerimientos energéticos globales del hidrógeno producido por debajo de los valores típicos encontrados para las celdas de electrólisis de alcohol convencionales. Estos resultados demuestran, por primera vez, la posibilidad de producir una tasa de producción de H 2 "sobre-faradaica" en una celda de electrólisis en fase líquida, lo que es de gran interés en vista de mejorar la eficiencia energética y los requisitos de potencia para la producción de hidrógeno a través de electrólisis de moléculas orgánicas.Elsevier202220222020info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://hdl.handle.net/10578/29829reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/298292026-05-27T07:36:41Z
score 15,301603

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