Details

Autor(en) / Beteiligte

• Liu, Liyuan
• Raymundo‐Piñero, Encarnacion
• Sunny, Sanjay
• Taberna, Pierre‐Louis
• Simon, Patrice

Titel

Role of Surface Terminations for Charge Storage of Ti3C2Tx MXene Electrodes in Aqueous Acidic Electrolyte

Ist Teil von

• Angewandte Chemie, 2024-04, Vol.136 (14), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• In this study, we used 2‐Dimmensionnal Ti3C2 MXene as model materials to understand how the surface groups affect their electrochemical performance. By adjusting the nature of the surface terminations (Cl‐, N/O‐, and O‐) of Ti3C2 MXene through a molten salt approach, we could change the spacing between MXene layers and the level of water confinement, resulting in significant modifications of the electrochemical performance in acidic electrolyte. Using a combination of techniques including in‐operando X‐ray diffraction and electrochemical quartz crystal microbalance (EQCM) techniques, we found that the presence of confined water results in a drastic transition from an almost electrochemically inactive behavior for Cl‐terminated Ti3C2 to an ideally fast pseudocapacitive signature for N,O‐terminated Ti3C2 MXene. This experimental work not only demonstrates the strong connection between surface terminations and confined water but also reveals the importance of confined water on the charge storage mechanism and the reaction kinetics in MXene. A transition from electrochemically inactive Cl‐terminated Ti3C2 to fast, pseudocapacitive behavior is reported for N,O‐terminated Ti3C2 MXene, attributed to the presence of confined water between the MXene layers. This study evidences the crucial role surface terminations and confined water in charge storage and reaction kinetics in MXene materials.