Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Maria R. Lukatskaya (1) , Olha Mashtalir (1) , Chang E. Ren (1) , Yohan Dall'Agnese (1, 2, 3) , Patrick Rozier (2) , Pierre-Louis Taberna (2) , Michael Naguib (1) , Patrice Simon (2, 3) , Michel W. Barsoum (1) , Yury Gogotsi (1)

1 Drexel University
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 RS2E - Réseau sur le stockage électrochimique de l'énergie

The intercalation of ions into layered compounds has long been exploited in energy storage devices such as batteries and electrochemical capacitors. However, few host materials are known for ions much larger than lithium. We demonstrate the spontaneous intercalation of cations from aqueous salt solutions between two-dimensional (2D) Ti3C2 MXene layers. MXenes combine 2D conductive carbide layers with a hydrophilic, primarily hydroxyl-terminated surface. A variety of cations, including Na+, K+, NH4+, Mg2+, and Al3+, can also be intercalated electrochemically, offering capacitance in excess of 300 farads per cubic centimeter (much higher than that of porous carbons). This study provides a basis for exploring a large family of 2D carbides and carbonitrides in electrochemical energy storage applications using single- and multivalent ions.

Mots clés: Cation intercalation- Volumetric capacitance; Two-dimensional titanium carbide

Domaines: Matériaux; Matériaux

Maria R. Lukatskaya, Olha Mashtalir, Chang E. Ren, Yohan Dall'Agnese, Patrick Rozier, et al.. Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide. Science, 2013, vol. 341 (n° 6153), pp. 1502-1505. ⟨10.1126/science.1241488⟩. ⟨hal-01157516⟩