Exploring The Role of The Local Environment in
Il y a 2 mois
**Exploring the role of the local environment in electrode-membrane assemblies for the electroconversion of CO2**:
- Réf **ABG-121840**
- Sujet de Thèse- 26/03/2024- Contrat doctoral- Institut Européen des Membranes- Lieu de travail- Montpellier - Occitanie - France- Intitulé du sujet- Exploring the role of the local environment in electrode-membrane assemblies for the electroconversion of CO2- Champs scientifiques- Chimie
- Chimie
- Mots clés- CO2, conversion du CO2, électrocatalyse, électrolyse**Description du sujet**:
- Context_
- The electrochemical reduction of carbon dioxide (CO2R) driven by renewably generated electricity (e.g., solar and wind) offers a promising means for reusing the CO2 released during the production of cement, steel, and aluminum as well as the production of ammonia and methanol. If CO2 could be removed from the atmosphere at acceptable costs, then CO2R could be used to produce carbon-containing chemicals and fuels in a fully sustainable manner. Significant progress has been made in the electro-conversion of CO2 into multi-carbon (C2+) products, drawing on proven technical features found in fuel cells, such as the gas diffusion electrode (GDE) and the membrane electrode electrolyser (MEA) architecture. Under optimal neutral and basic conditions, impressive progress has been made, with high faradic efficiency (FE, >90%) and substantial current density (>1 A.cm-2). Beyond the design of the metal catalysts, understanding the role of the local environment on the selectivity of the reaction and the stability of the system is one of the main obstacles to the development of this technology. This local environment in the microporous regions (region II) and the catalytic layer (region III) remains poorly understood, as it is located in an area that is difficult to probe using conventional operando spectroscopy techniques (Raman and infrared).**The aim of the thesis will be to develop original approaches based on the coupling of textural analyses and electrochemical measurements to study the physico-chemical behaviour of a membrane electrode assembly (MEA).**
- The electrocatalytic properties will be studied for different configurations of membrane-electrode assemblies prepared from different catalyst ink formulations in order to modulate the fluxes of CO2, ions and water at the level of the catalytic layer. Ion-conducting polymers (ionomers) will be used to modify the local concentrations of CO2, H2O, OH- and H+ to induce hydrophobicity, and charged groups at the ends of the side chains to modulate ion transport.- Methodology_
- The PhD student will use analytical techniques that combine gas sorption with an characterization technique dedicated to thin films and stacks available at the IEM, such as spectroscopic ellipsometry and microgravimetry by quartz crystal. The mass uptake, swelling and refractive index variation due to the sorption of CO2 and water in the presence of an ionomer layer will be studied initially on simple model stacks and may be extended to the study of the all-solid stack incorporating the electrolyte. The electrocatalytic characteristics of the various AEM configurations will be evaluated in continuous flow electrolysis cells. These evaluations will be completed by the use of analytical techniques to accurately measure the selectivity of the CO2 conversion reaction.**Prise de fonction**:
- 15/09/2024**Nature du financement**:
- Contrat doctoral**Précisions sur le financement**:
**Présentation établissement et labo d'accueil**:
- Institut Européen des MembranesLes recherches seront menées à l'Institut Européen des Membranes (IEM-UMR5635, CNRS, UM, ENSCM). Notre groupe est équipé d'installations dédiées de pointe, y compris des techniques de caractérisation ex-situ et in-situ pour mener à bien les projets. L'IEM est un institut de pointe au niveau mondial dans le domaine de la science des membranes, qui dispose d'un excellent soutien technique et d'installations internes pour la fabrication et la caractérisation des membranes. L'institut est affilié à l'Université de Montpellier et est membre du Pôle Chimie Balard, de l'Institut Carnot Chimie Balard et du Labex CheMiSyst.
Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.
**Site web**:
**Intitulé du doctorat**:
- Doctorat de Chimie**Pays d'obtention du doctorat**:
- France**Etablissement délivrant le doctorat**:
- Université de Montpellier**Ecole doctorale**:
- Sciences chimiques BalardWe are looking for bright and self-motivated PhD student who are interested in the electrochemical reduction of CO2
Our research aims to understand the behavior of low-dimensional materials towards the reduction of CO2. The successful applicants should be able to conduct fast-paced research in a team-oriented enviro
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