Author
Listed:
- Pranta Barua
(Advanced Manufacturing Alliance, Energy and Resources Institute, Faculty of Science and Technology, Charles Darwin University, Darwin, NT 0909, Australia)
- Tan Thai
(Advanced Manufacturing Alliance, Energy and Resources Institute, Faculty of Science and Technology, Charles Darwin University, Darwin, NT 0909, Australia)
- Kannoorpatti Krishnan
(Advanced Manufacturing Alliance, Energy and Resources Institute, Faculty of Science and Technology, Charles Darwin University, Darwin, NT 0909, Australia)
- Naveen Kumar Elumalai
(Advanced Manufacturing Alliance, Energy and Resources Institute, Faculty of Science and Technology, Charles Darwin University, Darwin, NT 0909, Australia)
Abstract
This study investigates the photocatalytic degradation of methylene blue (MB) using strontium-doped SnO 2 nanofibers synthesized via electrospinning. The 1% Sr-doped SnO 2 nanofibers exhibited remarkable photocatalytic activity, achieving 84.74% MB degradation under visible light irradiation, substantially outperforming both undoped SnO 2 nanofibers (61%) and the same catalyst under UV light (69%) under identical experimental conditions. Comprehensive electrochemical investigations revealed that Sr doping fundamentally transformed interfacial charge transfer kinetics, with 1% Sr-doped nanofibers exhibiting a remarkable three-fold decrease in charge transfer resistance (404 Ω compared to 1350 Ω for undoped samples), a dramatic enhancement in charge carrier density (5.17 × 10 22 versus 9.24 × 10 19 for undoped samples), and an approximately eight-fold increase in diffusion coefficient (8.78 × 10 −10 versus 1.13 × 10 −10 cm 2 s −1 ). These electrochemical improvements were corroborated by comprehensive structural characterization, which demonstrated that strategic Sr incorporation induced beneficial oxygen vacancies, reduced crystallite size, increased microstrain, and enhanced dislocation density, collectively contributing to superior surface reactivity and accelerated photocatalytic mechanisms. This work establishes a quantitative correlation between electrochemical characteristics and photocatalytic activity in Sr-doped SnO 2 nanofibers, revealing the fundamental mechanisms that transform the SnO 2 nanostructure from UV-dependent to efficient visible light-driven catalysts for organic pollutant degradation.
Suggested Citation
Pranta Barua & Tan Thai & Kannoorpatti Krishnan & Naveen Kumar Elumalai, 2025.
"Strontium-Doped Tin Oxide Nanofibers for Enhanced Visible Light Photocatalysis,"
Energies, MDPI, vol. 18(10), pages 1-34, May.
Handle:
RePEc:gam:jeners:v:18:y:2025:i:10:p:2495-:d:1654208
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