Probing the Mechanism of High Capacitance in 2D Titanium Carbide Using In Situ X-Ray Absorption Spectroscopy
Journal article published in 2015 by
Maria R. Lukatskaya 
,
Seong‐Min Bak ,
Xiqian Yu,
Xiao‐Qing Yang,
Michel W. Barsoum,
Yury Gogotsi
,
Seong‐Min Bak ,
Xiqian Yu,
Xiao‐Qing Yang,
Michel W. Barsoum,
Yury Gogotsi
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Abstract
Electrochemical in situ X-ray absorption spectroscopy (XAS) of 2D titanium carbide MXene is used to probe the mechanism of high capacitance of Ti3C2Tx MXene. Changes in the Ti oxidation state are detected during cycling, confirming that most of the capacitance of Ti3C2Tx is due to changes in the Ti oxidation state, i.e., pseudocapacitance.