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Journal article
Enhancement of Ti3C2 MXene Pseudocapacitance after Urea Intercalation Studied by Soft X‑ray Absorption Spectroscopy
Journal of physical chemistry. C, v 124(9), pp 5079-5086
05 Mar 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
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 Ti3C2T x (T x describes the -OH, -F and -O- surface terminations) flakes by ions or molecules, which in turn might alter the Ti3C2T x surface chemistry and electrochemical properties. In this work, we show that the capacitance, rate capability, and charge carrier kinetics in Ti3C2T x MXene electrodes are remarkably enhanced after urea intercalation (u-Ti3C2T x ). In particular, the areal capacitance increased to 1100 mF/cm2, which is 56% higher than that of pristine Ti3C2T x electrodes. We attribute this dramatic improvement to changes in the Ti3C2T x surface chemistry upon urea intercalation. The oxidation state and the oxygen bonding of individual Ti3C2T x 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 Ti3C2T x . Additionally, in situ XAS of u-Ti3C2T x aqueous dispersions reveal a higher Ti oxidation similar to dry samples, while for pristine Ti3C2T x the Ti atoms are significantly reduced in water compared to dry samples.
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Details
- Title
- Enhancement of Ti3C2 MXene Pseudocapacitance after Urea Intercalation Studied by Soft X‑ray Absorption Spectroscopy
- Creators
- Ameer Al-Temimy - Freie Universität BerlinBabak Anasori - Indiana University−Purdue University IndianapolisKatherine A MazzioFlorian KronastMykola Seredych - Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials InstituteNarendra Kurra - Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials InstituteMohamad-Assaad MawassSimone Raoux - Humboldt University BerlinYury Gogotsi - Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials InstituteTristan Petit
- Publication Details
- Journal of physical chemistry. C, v 124(9), pp 5079-5086
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000518703000016
- Scopus ID
- 2-s2.0-85080071507
- Other Identifier
- 991014969884004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology