Strontium-Doped Tin Oxide Nanofibers for Enhanced Visible Light Photocatalysis

Pranta Barua; Tan Thai; Kannoorpatti Krishnan; Naveen Elumalai

doi:10.3390/en18102495

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Strontium-Doped Tin Oxide Nanofibers for Enhanced Visible Light Photocatalysis

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Strontium-Doped Tin Oxide Nanofibers for Enhanced Visible Light Photocatalysis

Pranta Barua, Tan Thai, Kannoorpatti Krishnan and Naveen Elumalai

Energies, Vol.18(10), pp.1-32

2025

DOI: https://doi.org/10.3390/en18102495

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Abstract

electrospinning

oxygen vacancies

charge transport

diffusion coefficient

doping

This study investigates the photocatalytic degradation of methylene blue (MB) using strontium-doped SnO2 nanofibers synthesized via electrospinning. The 1% Sr-doped SnO2 nanofibers exhibited remarkable photocatalytic activity, achieving 84.74% MB degradation under visible light irradiation, substantially outperforming both undoped SnO2 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 Omega compared to 1350 Omega for undoped samples), a dramatic enhancement in charge carrier density (5.17 x 1022 versus 9.24 x 1019 for undoped samples), and an approximately eight-fold increase in diffusion coefficient (8.78 x 10-10 versus 1.13 x 10-10 cm2s-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 SnO2 nanofibers, revealing the fundamental mechanisms that transform the SnO2 nanostructure from UV-dependent to efficient visible light-driven catalysts for organic pollutant degradation.

Details

Title: Strontium-Doped Tin Oxide Nanofibers for Enhanced Visible Light Photocatalysis
Authors: Pranta Barua - Charles Darwin University
Tan Thai - Charles Darwin University
Kannoorpatti Krishnan - Charles Darwin University
Naveen Elumalai - Charles Darwin University
Publication details: Energies, Vol.18(10), pp.1-32
Publisher: MDPI AG
Date published: 2025
DOI: 10.3390/en18102495
ISSN: 1996-1073
Copyright note: © 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Data Availability: Data are available from the authors upon request.
Grants: Australian Government Research Training Program (RTP) Scholarship, RTP, Department of Education (Australia, Canberra)
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 991216650102621
Output Type: Journal article

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