Is the Amount of Water the Most Important Parameter in Concentrated Aqueous Electrolytes? The Case of Aqueous Magnesium Cells
Uloženo v:
| Název: | Is the Amount of Water the Most Important Parameter in Concentrated Aqueous Electrolytes? The Case of Aqueous Magnesium Cells |
|---|---|
| Autoři: | Malaurie Paillot, Sophie Le Caër, Magali Gauthier |
| Přispěvatelé: | Gauthier, Magali |
| Zdroj: | ACS Electrochemistry. 1:1452-1461 |
| Informace o vydavateli: | American Chemical Society (ACS), 2025. |
| Rok vydání: | 2025 |
| Témata: | [CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, gas analysis, [CHIM] Chemical Sciences, concentrated electrolytes, infrared spectroscopy, hydrogen evolution reaction, aqueous batteries |
| Popis: | Aqueous magnesium batteries, based on abundant ions, are a promising alternative to Li-ion batteries. However, their reactivity in electrochemical full cells remains largely unexplored. Herein, we focused on the effect of the hydrogen evolution reaction in magnesium full cells based on aqueous electrolytes. We screened both the electrolyte structuration and the gas production in aqueous magnesium batteries as a function of the nature of the electrolyte: imide-, acetate-, perchlorate-, bisalt-, and polymer-based electrolytes. We have particularly focused on H2 production for assessing solution stability. At low molalities, H2 production correlates with the kosmotropic–chaotropic properties of anions, consistent with the solution structure and elevated free-water content revealed by infrared spectroscopy. Conversely, at high molalities, H2 production follows the same trend across all electrolytes, even though infrared spectroscopy reveals distinct differences in their structuration. In this regime, H2 evolution decreases linearly with increasing salt concentration. Thus, while anion identity exerts a major influence on hydrogen-bond network organization, the system’s reactivity (as gauged by H2 production) is predominantly controlled by the available water content. |
| Druh dokumentu: | Article |
| Popis souboru: | application/pdf |
| Jazyk: | English |
| ISSN: | 2997-0571 |
| DOI: | 10.1021/acselectrochem.5c00082 |
| Přístupová URL adresa: | https://hal.science/hal-05148551v1/document https://doi.org/10.1021/acselectrochem.5c00082 https://hal.science/hal-05148551v1 |
| Rights: | STM Policy #29 CC BY |
| Přístupové číslo: | edsair.doi.dedup.....e4bd1da9523903ad1ba2d7e7f4ef6970 |
| Databáze: | OpenAIRE |
Nájsť tento článok vo Web of Science | Abstrakt: | Aqueous magnesium batteries, based on abundant ions, are a promising alternative to Li-ion batteries. However, their reactivity in electrochemical full cells remains largely unexplored. Herein, we focused on the effect of the hydrogen evolution reaction in magnesium full cells based on aqueous electrolytes. We screened both the electrolyte structuration and the gas production in aqueous magnesium batteries as a function of the nature of the electrolyte: imide-, acetate-, perchlorate-, bisalt-, and polymer-based electrolytes. We have particularly focused on H2 production for assessing solution stability. At low molalities, H2 production correlates with the kosmotropic–chaotropic properties of anions, consistent with the solution structure and elevated free-water content revealed by infrared spectroscopy. Conversely, at high molalities, H2 production follows the same trend across all electrolytes, even though infrared spectroscopy reveals distinct differences in their structuration. In this regime, H2 evolution decreases linearly with increasing salt concentration. Thus, while anion identity exerts a major influence on hydrogen-bond network organization, the system’s reactivity (as gauged by H2 production) is predominantly controlled by the available water content. |
|---|---|
| ISSN: | 29970571 |
| DOI: | 10.1021/acselectrochem.5c00082 |