Journal article
Improving charge transport in integrated MoO3/C electrode materials for water-in-salt energy storage systems by incorporating oxygen vacancies
Journal of power sources, v 583, 233531
Nov 2023
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Improvements in the charge storage properties of ⍺-MoO3 used as an electrode with a 30 m ZnCl2 water-in-salt electrolyte have been achieved by enhancements in electron and ion transport enabled by an inventive synthesis route. Electron transport was improved through the integration of MoO3 with dopamine-derived carbon via a chemical preintercalation route, and enhanced ion transport was achieved by incorporating oxygen vacancies in MoO3 structure through ethanol reduction under hydrothermal conditions. The presence of carbon was confirmed by corresponding D and G bands observed in Raman spectroscopy measurements. The presence of oxygen vacancies was proven through correlated XPS, TGA, Raman spectroscopy and XRD analyses, with the introduction of oxygen vacancies leading to an expanded interlayer region. Four-point probe measurements provided evidence of increased electronic conductivity due to the incorporation of carbon, and cyclic voltammetry-based charge storage mechanism analyses revealed increases in ion transport kinetics due to oxygen vacancy formation. Tuning the oxygen vacancy concentration is critical, as excessive concentrations of these point defects leads to structural instability and poor capacity retention. This work demonstrates the combined potential of carbon and oxygen vacancies in moderate concentrations to enhance the charge storage properties of transition metal oxides. The strategies developed in this study offer a path to the development of promising materials for high-rate, high-capacity, and long-duration electrochemical energy storage technologies.
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•Adding dopamine and ethanol into synthesis of α-MoO3 led to improved charge storage.•Dopamine served as a carbon precursor and a reducing agent to form oxygen vacancies.•Incorporation of ethanol allowed to increase concentration of oxygen vacancies.•Formed carbon and oxygen vacancies facilitated charge transport in MoO3-x/C materials.•The best performance in aqueous Zn-ion cells with WISE was shown by ⍺-MoO3-x/C-50μL.
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Details
- Title
- Improving charge transport in integrated MoO3/C electrode materials for water-in-salt energy storage systems by incorporating oxygen vacancies
- Creators
- Farbod Alimohammadi - Drexel UniversityDarrell Omo-Lamai - Drexel UniversityRyan Andris - Drexel UniversityTimofey Averianov - Drexel UniversityZhongling Wang - Stony Brook UniversityLei Wang - Brookhaven National LaboratoryKim Kisslinger - Brookhaven National LaboratoryEsther S. Takeuchi - Stony Brook UniversityAmy C. Marschilok - Stony Brook UniversityKenneth J. Takeuchi - Stony Brook UniversityEkaterina Pomerantseva - Drexel University
- Publication Details
- Journal of power sources, v 583, 233531
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pennoni Honors College; Materials Science and Engineering
- Web of Science ID
- WOS:001074220900001
- Scopus ID
- 2-s2.0-85170067152
- Other Identifier
- 991021197808704721
UN Sustainable Development Goals (SDGs)
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Electrochemistry
- Energy & Fuels
- Materials Science, Multidisciplinary