On the atomic structure of monolayer V$_4$C$_3$T$_z$ and the study of charge storage processes in an acidic electrolyte using SPEIS and in-situ X-ray absorption spectroscopy - ST2E
Article Dans Une Revue Energy Storage Materials Année : 2024

On the atomic structure of monolayer V$_4$C$_3$T$_z$ and the study of charge storage processes in an acidic electrolyte using SPEIS and in-situ X-ray absorption spectroscopy

Résumé

Monolayer V$_4$C$_3$T$_z$ is synthesized and its atomic structure is studied using high-end transmission electron microscopy. X-Ray diffraction reveals key 3D to 2D crystal transformations as a V$_4$AlC$_3$ crystal is transformed into V$_4$C$_3$T$_z$ in synthesis processes. The charge storage properties of V$_4$C$_3$T$_z$ film electrodes are investigated for supercapacitor applications in 3 M H$_2$SO$_4$. V$_4$C$_3$T$_z$ film electrodes shows an excellent capacitance of up to 469.6 F g$^{-1}$ and 845.7 F cm$^{-3}$, rate performance up to 30 A g$^{-1}$ and cycling stability up to 10,000 cycles. A combination of electrochemical kinetics/mass transport models, staircase potentio-electrochemical impedance spectroscopy and in situ X-Ray absorption spectroscopy reveals, for the first time for this MXene, the underlying charge storage mechanisms, consisting of double layer capacitance, pseudocapacitance and a minor contribution from mass transport-controlled processes. The latter two implying a outstanding redox activity superior to Ti-based MXenes. The stability in standard environments, mechanical flexibility and the demonstrated excellent charge storage performance of V$_4$C$_3$T$_z$ makes it one of the best candidates for supercapacitor applications, especially in miniaturized devices.
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Dates et versions

hal-04673418 , version 1 (21-08-2024)

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Beatriz Mendoza-Sánchez, Atharva Ladole, Enrique Samperio-Niembro, Stefan Mangold, Michael Knapp, et al.. On the atomic structure of monolayer V$_4$C$_3$T$_z$ and the study of charge storage processes in an acidic electrolyte using SPEIS and in-situ X-ray absorption spectroscopy. Energy Storage Materials, 2024, 71, pp.103566. ⟨10.1016/j.ensm.2024.103566⟩. ⟨hal-04673418⟩
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