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- W3025633048 abstract "MXenes have shown outstanding properties due to their highly active hydrophilic surfaces coupled with high metallic conductivity. Many applications rely on the intercalation between Ti₃C₂Tₓ (Tₓ describes the -OH, -F and -O- surface terminations) flakes by ions or molecules, which in turn might alter the Ti₃C₂Tₓ surface chemistry and electrochemical properties. In this work, we show that the capacitance, rate capability, and charge carrier kinetics in Ti₃C₂Tₓ MXene electrodes are remarkably enhanced after urea intercalation (u-Ti₃C₂Tₓ). In particular, the areal capacitance increased to 1100 mF/cm², which is 56% higher than that of pristine Ti₃C₂Tₓ electrodes. We attribute this dramatic improvement to changes in the Ti₃C₂Tₓ surface chemistry upon urea intercalation. The oxidation state and the oxygen bonding of individual Ti₃C₂Tₓ flakes before and after urea intercalation are probed by soft X-ray absorption spectroscopy (XAS) at the Ti L- and O K-edges with 30 nm spatial resolution in vacuum. After urea intercalation, a higher Ti oxidation state is observed across the entire flake compared to pristine Ti₃C₂Tₓ. Additionally, in situ XAS of u-Ti₃C₂Tₓ aqueous dispersions reveal a higher Ti oxidation similar to dry samples, while for pristine Ti₃C₂Tₓ the Ti atoms are significantly reduced in water compared to dry samples." @default.
- W3025633048 created "2020-05-21" @default.
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- W3025633048 date "2020-01-01" @default.
- W3025633048 modified "2023-09-26" @default.
- W3025633048 title "Enhancement of Ti₃C₂ MXene Pseudocapacitance after Urea Intercalation Studied by Soft X-ray Absorption Spectroscopy" @default.
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