Probing the Mechanism of High Capacitance in 2D Titanium Carbide Using In Situ XRay Absorption Spectroscopy
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چکیده
(comparable only with hydrated RuO 2 ) was measured for Ti 3 C 2 T x in aqueous electrolytes. [ 11,14 ] Our previous studies revealed that spontaneous intercalation of some cations takes place when MXene samples are exposed to aqueous electrolytes. [ 6 ] In situ X-ray diffraction showed that variations of the distance between the Ti 3 C 2 T x layers (which is proportional to the c lattice parameter, c -LP) during cycling is small (<5%) and no phase changes were detected. [ 6 ] Electrochemical quartz crystal admittance (EQCA) studies of Ti 3 C 2 T x multilayer particles in several aqueous electrolytes with different cations revealed that cation insertion is accompanied by electrode deformations (expansion/contraction), facilitated by the presence of water molecules. These deformations occur so quickly, however, that they closely resemble 2D ion adsorption at solid– liquid interfaces. [ 15 ] Moreover, it was found that surface chemistry has a signifi cant effect on the capacitive response in acids: decreased amount of F-terminations, relative to those of O and OH, resulted in a signifi cant increase in specifi c capacitance, i.e., almost doubling it. [ 14 ]
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