Rational Sulfur Vacancy Design Enhances the Electrochemical and Nonlinear Optical Properties of V₂CT_x/WS₂.

Authors

Fei Hu, Jinhe Wei, Xinyu Quan, Zixuan Jiang, Qiuyun Ouyang

Published in

Small methods. Pages e71016. Sep 02, 2026. Epub Sep 02, 2026.

Abstract

The concurrent optimization of electrochemical energy storage and third-order nonlinear optical (NLO) performance within a single material system remains a fundamental challenge. Here, V₂CT_x/WS₂ composites were fabricated via a solvothermal method on carbon cloth substrates, and (V₂CT_x/WS₂)_x/PMMA were prepared for optical measurements. Interfacial interactions between V₂CT_x surface functional groups and WS₂ promote the formation of sulfur vacancies and interfacial charge redistribution during compositing. The enlarged interlayer spacing, three-dimensional WS₂ nanoflower architecture, and defect-rich structure collectively increase accessible active sites and facilitate charge transport. The V₂CT_x/WS₂ electrode delivers a specific capacity of 2251.95 F·g^-1 at 1 A·g^-1, retaining 94.80% of its initial capacity after 10 000 cycles. The assembled supercapacitor achieves an energy density of 47.93 Wh·kg^-1 at a power density of 983.45 W·kg^-1. For NLO performance, the (V₂CT_x/WS₂)₈/PMMA sample exhibits a nonlinear absorption coefficient β of 232 cm·GW^-1, a nonlinear refraction coefficient γ of -9.29 × 10^-4 cm²·GW^-1, and an optical limiting threshold of 1.09 J·cm^-2. The results demonstrate that V₂CT_x/WS₂ exhibits excellent electrochemical and NLO properties through composite structure design and defect engineering.

PMID:
42684079
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.

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