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Journal article
Operando X‑ray Reflectivity Reveals the Dynamical Response of Ti3C2 MXene Film Structure during Electrochemical Cycling
ACS energy letters, v 7(10), pp 3612-3617
14 Oct 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The dynamical structural response of MXenes during electrochemical ion intercalation is critical for their functionality in fast chemical actuation and high-power electrical energy storage but has yet to be observed. Here, the dynamically evolving layer spacing of a Ti3C2T x MXene film was observed using time-resolved operando X-ray reflectivity during cyclic voltammetry for applied potentials between +0.3 and −0.7 V (vs Ag/AgCl) at sweep rates 1 ≤ v ≤ 500 mV/s. The pseudocapacitive electrochemical MXene response in the aqueous 0.1 M Li2SO4 electrolyte, including both capacitive and redox characteristics, is characterized by kinetically limited lithium intercalation and layer contraction. Two types of dynamical responses were observed: slow and fast lattice contraction regimes versus applied potential are correlated with the capacitive and redox features, respectively, with structural relaxation rates that scale as ∼v 1/2 and ∼v, revealing two distinct dynamical structural responses during electrochemical ion intercalation.
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Details
- Title
- Operando X‑ray Reflectivity Reveals the Dynamical Response of Ti3C2 MXene Film Structure during Electrochemical Cycling
- Creators
- Thomas B. Sobyra - Argonne National LaboratoryKyle Matthews - A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United StatesTyler S. Mathis - A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United StatesYury Gogotsi - A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United StatesPaul Fenter - Argonne National Laboratory
- Publication Details
- ACS energy letters, v 7(10), pp 3612-3617
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000898489600001
- Scopus ID
- 2-s2.0-85139254825
- Other Identifier
- 991019173523004721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Electrochemistry
- Energy & Fuels
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology