Effect of oxygenated functionalities on the phase transitions of an ionic liquid confined in a mesoporous carbon host

Zhuanpei Wang; Emmanuel Pameté Yambou; Agnieszka Chojnacka; Seyed Esmaeil Mohammadi Pourhosseini; Paula Ratajczak; François Béguin

doi:10.1016/j.carbon.2022.09.049

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Tytuł

Effect of oxygenated functionalities on the phase transitions of an ionic liquid confined in a mesoporous carbon host

Autorzy

Zhuanpei Wang (WTCH) ^{[ 1 ][ 7.6 ][ P ]}
Emmanuel Pameté Yambou (WTCH) ^{[ 1 ][ 7.6 ][ D ]}
Agnieszka Chojnacka (WTCH) ^{[ 1 ][ 7.6 ][ P ]}
Seyed Esmaeil Mohammadi Pourhosseini (WTCH) ^{[ 1 ][ 7.6 ][ SzD ]}
Paula Ratajczak (WTCH) ^{[ 1 ][ 7.6 ][ P ]}
François Béguin (WTCH) ^{[ 1 ][ 7.6 ][ P ]}

^{[ 1 ]} Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | ^{[ P ]} pracownik | ^{[ D ]} doktorant | ^{[ SzD ]} doktorant ze Szkoły Doktorskiej

Dyscyplina naukowa (Ustawa 2.0)

[7.6] Nauki chemiczne

Rok publikacji

2023

Opublikowano w

Carbon

Rocznik: 2023 | Tom: vol. 202, part 1

Typ artykułu

artykuł naukowy

Język publikacji

angielski

Słowa kluczowe

EN

Ionic liquid confinement
Oxidized mesoporous carbons
Phase transitions
Interfacial and intermolecular interactions
Differential scanning calorimetry
Raman spectroscopy

Streszczenie

EN The effect of surface functionalization on the carbon walls-ionic liquid (IL) interactions is analyzed by combining differential scanning calorimetry (DSC) and Raman spectroscopy. Four mesoporous carbons (Lmeso ~ 9.0 nm) with a gradually increasing oxygenated surface functionality have been soaked with the 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide ([EMIm+][FSI−]) IL at filling ratios R ≈ 0.8 (almost complete pore fullness) and R ≈ 1.2 (fully filled pores with excess liquid). The low temperature behavior of the IL molecules confined in mesopores depends on their distribution between two populations: i) located close to the pore center, or ii) near the pore walls. In the surface clean material soaked with R ≈ 0.8, the molecules in the proximity of the pore center are involved in freezing/melting, whereas the species located in the vicinity of the pore walls are involved in a glass transition upon cooling, followed by cold crystallization and melting upon heating. When applying the functionalized carbon hosts, all the species located near the pore surface freeze already upon cooling, owing to their aggregation to the walls through the formation of hydrogen bonds with the surface oxygenated functionality. The amount of [EMIm+][FSI−] exhibiting exclusively freezing/melting can be as well enhanced by completely filling the pores (R ≈ 1.2) to strengthen the IL-IL and IL-carbon interactions. The information derived from this study is crucial for designing an optimal porous carbon-IL system intended to be implemented in e.g., electrochemical capacitors (ECs) operating at low temperature.

Data udostępnienia online

19.09.2022

Strony (od-do)

571 - 582

DOI

10.1016/j.carbon.2022.09.049

URL

https://www.sciencedirect.com/science/article/pii/S0008622322007734?via%3Dihub

Typ licencji

CC BY (uznanie autorstwa)

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