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<p>In this study, we synthesized manganese-doped tin oxide nanoparticles via a chemical route. We characterized the nanoparticles using X-ray diffraction, UV–Vis spectroscopy, and photoluminescence spectroscopy. Our findings indicate that higher manganese doping concentrations lead to a decrease in crystallite size. Furthermore, while undoped tin oxide exhibited a band gap of 3.55&#xa0;eV, the introduction of manganese into the tin lattices successfully reduced this band gap. The photoluminescence spectra revealed that the manganese dopant significantly suppresses the recombination rate of charge carriers. The synthesized nanoparticles are used as the electrode material in an ultracapacitor. To investigate the specific capacitance, the galvanostatic charge–discharge technique and the cyclic voltammetry technique are performed. The calculated value of specific capacitances for 196, 207 and 234&#xa0;F/g at 1&#xa0;A/g are observed with different doping concentrations of manganese. The doping enhances the specific capacitance, which could be favorable for an ultracapacitor.</p>

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Doping driven electrochemical enhancement in Mn-doped tin oxide nanoparticles for ultracapacitor electrodes

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • G. Sneha,
  • L. Bruno Chandrasekar,
  • M. Anusha,
  • Kaleel Mohamed Ibrahim,
  • S. Rafi Ahamed,
  • M. Karunakaran,
  • J. Merciline Leonora,
  • P. Shunmuga Sundaram,
  • Sonaimuthu Mohandoss,
  • D. Shanmugapriya,
  • J. Thirumalai

摘要

In this study, we synthesized manganese-doped tin oxide nanoparticles via a chemical route. We characterized the nanoparticles using X-ray diffraction, UV–Vis spectroscopy, and photoluminescence spectroscopy. Our findings indicate that higher manganese doping concentrations lead to a decrease in crystallite size. Furthermore, while undoped tin oxide exhibited a band gap of 3.55 eV, the introduction of manganese into the tin lattices successfully reduced this band gap. The photoluminescence spectra revealed that the manganese dopant significantly suppresses the recombination rate of charge carriers. The synthesized nanoparticles are used as the electrode material in an ultracapacitor. To investigate the specific capacitance, the galvanostatic charge–discharge technique and the cyclic voltammetry technique are performed. The calculated value of specific capacitances for 196, 207 and 234 F/g at 1 A/g are observed with different doping concentrations of manganese. The doping enhances the specific capacitance, which could be favorable for an ultracapacitor.