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Journal article
Evolution of electrochemical redox activity and capacity in vanadium-enriched solid-solution MXene-derived oxides for Li-ion batteries
Acta Materialia, v 314, 122365
Aug 2026
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Abstract
Solid-solution MXenes emerged as promising precursors for the synthesis of bilayered vanadium oxides (BVOs), offering the ability to introduce multiple transition metals and tune electrochemical properties. However, limited understanding of transition metal site incorporation in the resulting oxides has hindered reliable design. Here, we report the transformation of vanadium-enriched (NbyV2-y)CTx (y = 0.00, 0.25, 0.50) MXenes into MXene-derived BVOs via a two-step dissolution–recrystallization process. Increasing Nb content in the precursor leads to more polycrystalline oxides, reflecting cation size mismatch and its effect on long-range particle growth. Electrochemical testing of (NbyV2-y)CTx-derived oxides in non-aqueous Li-ion cells reveals new redox features at lower potentials and higher charge storage capacities, reaching up to 495 mAh g⁻¹ at 20 mA g⁻¹ (1.0–4.0 V) for the Nb0.50V1.50CTx-derived oxide, along with enhanced rate capability. Atomic-level characterization confirms uniform Nb distribution, indicating that Nb forms substitutional defects within the bilayers which, for the first time, leads to intralayer Nb-doped BVO with superior electrochemical activity relative to the parent phase. These findings demonstrate that solid-solution MXenes enable heterogeneous atom doping directly within the layered framework, offering a powerful route to novel doped oxides with enhanced functional properties beyond those achievable by conventional methods.
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Details
- Title
- Evolution of electrochemical redox activity and capacity in vanadium-enriched solid-solution MXene-derived oxides for Li-ion batteries
- Creators
- Timofey Kirillovich Averianov - Drexel University, Materials Science and EngineeringMichael J. Zachman - Oak Ridge National LaboratoryXinle Zhang - Drexel University, Materials Science and EngineeringYash N Athreya - Drexel University, A.J. Drexel Nanomaterials InstituteDerick Phan - Drexel UniversityEkaterina A Pomerantseva (Corresponding Author) - Drexel University, Materials Science and Engineering
- Publication Details
- Acta Materialia, v 314, 122365
- Publisher
- Elsevier
- Number of pages
- 9
- Grant note
- National Science Foundation: DMR-2427077 Solutions Innovation Research Award (SIRA) as part of the Agilent University Relations initiative: 4932
This work was supported by the National Science Foundation grant DMR-2427077. We thank Dr. Marcelo A. Andrade (Nantes University, previously Materials Electrochemistry Group at Drexel University) for providing MAX phase materials. We thank Dr. Yuan Zhang and Prof. Yury Gogotsi (A.J. Drexel Nanomaterials Institute, Department of Materials Science and Engineering, Drexel University) for providing access to inductively coupled plasma optical emission spectroscope characterization, supported by the Solutions Innovation Research Award (SIRA) as part of the Agilent University Relations initiative under grant ID #4932. We thank the Drexel Materials Characterization Core for providing access to SEM, EDS, and XRD instruments. The STEM and EELS portion of this research was supported by the Center for Nanophase Materials Sciences (CNMS), which is a US Department of Energy, Office of Science User Facility at Oak Ridge National Laboratory.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:001782372100001
- Scopus ID
- 2-s2.0-105039941956
- Other Identifier
- 991022181775204721