| Title: |
Defect Engineering and Effect of Vacancy Concentration on the Electrochemical Performance of V-Based MXenes |
| Authors: |
Qin, Leiqiang; Samal, Rutuparna; Jiang, Jianxia; Halim, Joseph; Chen, Ningjun; Chabanais, Florian; Persson, Per O A; Rosén, Johanna |
| Publisher Information: |
Linköpings universitet, Materialdesign; Linköpings universitet, Tekniska fakulteten; Linköpings universitet, Tunnfilmsfysik; Jiangxi Sci & Technol Normal Univ, Peoples R China; WILEY |
| Publication Year: |
2026 |
| Collection: |
Linköping University Electronic Press (LiU E-Press) |
| Subject Terms: |
defect engineering; energy storage; fast electron and ion transport; MXenes; vacancy concentration control; Other Engineering and Technologies; Annan teknik |
| Description: |
Vacancies play a pivotal role in determining the physical and chemical properties of materials. Introducing vacancies into two-dimensional (2D) materials offers a promising strategy for developing high-performance electrode materials for electrochemical energy storage. Herein, a facile top-down strategy is employed to create V-based MXenes with tunable vacancy concentrations, achieved by designing the precursor (V1-xCrx)2AlC (x = 0.05, 0.1, 0.3) MAX phase and precisely controlling the etching process. Systematic investigations reveal that introducing a moderate concentration of Cr-induced vacancies significantly enhances both the capacitance and rate performance of V-based MXenes. Specifically, V1.9CTz achieves a capacitance of 760 F g-1, far exceeding the 420 F g-1 of vacancy-free V2CTz MXene. In contrast, an excessively high vacancy concentration leads to deteriorated electrochemical performance and compromised structural stability. This work illustrates that defect engineering is a powerful approach to tailor the electrochemical properties of MXenes, offering a framework for designing next-generation MXene-based energy storage systems. ; Funding Agencies|Knut and Alice Wallenberg (KAW) Foundation [2019.0433, 2020.0033]; Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University [SFOMat-LiU 2009-00971]; European Union (ERC) [101087713]; Technological Expertise and Academic Leaders Training Program of Jiangxi Province-Youth Program [20243BCE51085]; Jiangxi Provincial Natural Science Foundation [20224BAB214022]; Swedish National Infrastructure in Advanced Electron Microscopy [2021-00171, RIF21-0026] |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
Energy & Environmental Materials, 2026; ISI:001657930600001 |
| DOI: |
10.1002/eem2.70253 |
| Availability: |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-220778; https://doi.org/10.1002/eem2.70253 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.369AED23 |
| Database: |
BASE |