Scholarlink

<p>This study presents a novel approach to enhancing the electrochemical performance of TiO<sub>2</sub>-based supercapacitors through controlled iron (Fe) doping and post-synthesis laser treatment. Fe-doped TiO<sub>2</sub> nanocrystals (FTNCs) were synthesized via a sol–gel method, with doping concentrations optimized at Fe-3 and 5 wt%. Structural and morphological analyses revealed that Fe<sup>3+</sup> ions substituted into the TiO<sub>2</sub> lattice, inducing crystallite size enlargement (from 25.75&#xa0;nm for pure TiO<sub>2</sub> to 39.92&#xa0;nm for Fe-5 wt% TiO<sub>2</sub>) alongside reduced microstrain and dislocation density, contrasting conventional doping-induced size reduction trends. Post-synthesis laser treatment further refined crystallinity and electronic properties, promoting homogeneous dopant distribution and reduced charge recombination. Electrochemical evaluations demonstrated superior performance for Fe-5 wt% TiO<sub>2</sub>, achieving a specific capacitance of&#xa0;93.23&#xa0;Fg<sup>−1</sup>&#xa0;at 5&#xa0;mVs<sup>−1</sup>, significantly surpassing undoped TiO<sub>2</sub> 17&#xa0;Fg<sup>−1</sup>, and outperforming many reported TiO<sub>2</sub>-based systems. The enhanced performance is attributed to Fe-induced oxygen vacancies, pseudocapacitive redox activity, and improved charge transfer kinetics, evidenced by a low charge transfer resistance (1.12 Ω) in EIS analysis. This work underscores the efficacy of controlled Fe doping in optimizing TiO<sub>2</sub> for energy storage, offering new insights into defect engineering and post-processing strategies. The findings highlight the potential of Fe–TiO<sub>2</sub> nanocrystals as high-performance electrode materials for next-generation supercapacitors, with prospects in multi-element co-doping and hybrid composite architectures.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Post-synthesis laser treatment, characterization, and enhanced electrochemical properties of Fe–TiO2 for supercapacitors

  • 期刊论文

  • 发表日期：

    2025年11月20日

查看全文
  • Muhammad Irfan,
  • Adina Palwasha,
  • Palwasha Ramzan,
  • Mahnoor Batool,
  • Azhar Ali Haidry,
  • Lamia Ben Farhat

摘要

This study presents a novel approach to enhancing the electrochemical performance of TiO2-based supercapacitors through controlled iron (Fe) doping and post-synthesis laser treatment. Fe-doped TiO2 nanocrystals (FTNCs) were synthesized via a sol–gel method, with doping concentrations optimized at Fe-3 and 5 wt%. Structural and morphological analyses revealed that Fe3+ ions substituted into the TiO2 lattice, inducing crystallite size enlargement (from 25.75 nm for pure TiO2 to 39.92 nm for Fe-5 wt% TiO2) alongside reduced microstrain and dislocation density, contrasting conventional doping-induced size reduction trends. Post-synthesis laser treatment further refined crystallinity and electronic properties, promoting homogeneous dopant distribution and reduced charge recombination. Electrochemical evaluations demonstrated superior performance for Fe-5 wt% TiO2, achieving a specific capacitance of 93.23 Fg−1 at 5 mVs−1, significantly surpassing undoped TiO2 17 Fg−1, and outperforming many reported TiO2-based systems. The enhanced performance is attributed to Fe-induced oxygen vacancies, pseudocapacitive redox activity, and improved charge transfer kinetics, evidenced by a low charge transfer resistance (1.12 Ω) in EIS analysis. This work underscores the efficacy of controlled Fe doping in optimizing TiO2 for energy storage, offering new insights into defect engineering and post-processing strategies. The findings highlight the potential of Fe–TiO2 nanocrystals as high-performance electrode materials for next-generation supercapacitors, with prospects in multi-element co-doping and hybrid composite architectures.