Influence of Lithium Sulfate on the Kinetics of Hydrogen Oxidation in H<sub>2</sub>so<sub>4</sub>
Notice bibliographique
Résumé
During the last few years, development of lithium ion batteries (LIB) offers innovative solutions for energy storage and has major role in the global energy future. Now used for many purposes, the increase in energy demand is driving the development and the production of LIB towards more environmentally friendly methods while also reducing their production costs. Nemaska lithium, a Canadian collaborator in this project, is recognized as a new producer of lithium hydroxide, a key precursor for high capacity Li-ion cathode material production. In a constant improvement ambition, Nemaska Lithium decided to study the opportunity to use an Hydrogen Depolarized Anode (HDA) in order to save energy for the direct electromembrane synthesis of high purity Lithium Hydroxide (LH). This new technology is based on hydrogen oxidation instead of oxygen evolution reaction, (H 2(g) -> 2H + (aq) +2e - ; E 0 =0,00V vs NHE), this configuration allows for the decrease of the voltage of the electrolysis cell. With a structure similar to proton exchange membrane fuel cells (PEMFC) anode, an HDA is a porous electrode, supplied with hydrogen from its gas diffusion side and in contact with the electrolyte in the catalyst coated side. The reaction itself is taking place in a small part of the electrode called the catalytic layer. It consists of a triple phase point; an ionomer (for the proton’s transport), platinum nanoparticles (used as catalyst) and a conductive carbon (for electron transport). This study is focusing on two aspects that can influence the performance of the catalytic layer: the impact of the electrolyte on the reaction kinetics and its composition on its efficiency. In order to further advance our knowledge of the reaction mechanism occurring at the HDA, a study on the reaction kinetic of hydrogen oxidation on platinum was conducted. Usually studied in sulphuric acid, the reaction is monitored in this case in the presence of lithium sulfate. For this study, a rotating disk electrode (RDE) has been used. The advantage of this hydrodynamic method is to reduce the dependence of the system on mass transport in order to isolate kinetic current. Using the Koutecky-Levich equation combined with RDE measurements, a logarithmic representation of Tafel slopes for different lithium concentrations have been determined. Linking overpotential to current density, the Tafel curves are used to determine the influence of lithium sulfate on the kinetic of hydrogen oxidation. In a first step, the study was performed on platinum disk electrode. With this well-established system, it was possible to conclude a significant decrease in reaction kinetic in the presence of the salt. Subsequently, the same technique is conducted on a vitreous carbon electrode, where a porous catalytic layer close to HDA configuration is deposited. This configuration allows to study the impact of ionomer presence close to Pt nanoparticles that would change interface between platinum surface and lithium salt electrolyte.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».