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<p>In this study, we synthesize Sr-doped α-MnO<sub>2</sub> nanoparticles using a straightforward chemical process, with polyvinylpyrrolidone (PVP) added to control the size and growth of the particles. X-ray diffraction (XRD) analysis confirmed the structural integrity, lattice characteristics, and crystallite sizes of 15&#xa0;nm for α-MnO₂ and 10.2&#xa0;nm for Sr-doped α-MnO₂. X-ray photoelectron spectroscopy (XPS) was employed to ascertain the oxidation states of Mn and Sr, whereas UV-Vis spectroscopy demonstrated a blue shift, signifying alterations in the electronic structure. Vibrating sample magnetometry (VSM) measurements showed a narrow hysteresis loop, indicating weak ferromagnetic behaviour superimposed on a dominant paramagnetic contribution, which originates from surface spin disorder and Sr-induced lattice strain. Electrochemical impedance spectroscopy (EIS) evaluated the electrochemical response under ambient conditions, while thermogravimetric-differential thermal analysis (TG-DTA) offered insights into thermal stability and lattice distortions. Cyclic voltammetry (CV) demonstrated quasi-rectangular curves, indicating pseudo-capacitive behaviour with a specific capacitance of 547.3&#xa0;F/g. The nanocomposites also demonstrated excellent photocatalytic activity, achieving 94% degradation of Rose Bengal and 96% degradation of Fast Green dyes. With outstanding optical, magnetic, electrochemical, and photocatalytic properties, the Sr-doped α-MnO₂ is an auspicious material for energy storage and environmental remediation applications.</p>

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Dual functionality of Sr-doped α-MnO₂ nanoparticles for energy storage and environmental remediation

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Shobana V,
  • Nachimuthu Venkatesh,
  • Muruganandam S,
  • Govindhasamy Murugadoss,
  • Vijayalakshmi S

摘要

In this study, we synthesize Sr-doped α-MnO2 nanoparticles using a straightforward chemical process, with polyvinylpyrrolidone (PVP) added to control the size and growth of the particles. X-ray diffraction (XRD) analysis confirmed the structural integrity, lattice characteristics, and crystallite sizes of 15 nm for α-MnO₂ and 10.2 nm for Sr-doped α-MnO₂. X-ray photoelectron spectroscopy (XPS) was employed to ascertain the oxidation states of Mn and Sr, whereas UV-Vis spectroscopy demonstrated a blue shift, signifying alterations in the electronic structure. Vibrating sample magnetometry (VSM) measurements showed a narrow hysteresis loop, indicating weak ferromagnetic behaviour superimposed on a dominant paramagnetic contribution, which originates from surface spin disorder and Sr-induced lattice strain. Electrochemical impedance spectroscopy (EIS) evaluated the electrochemical response under ambient conditions, while thermogravimetric-differential thermal analysis (TG-DTA) offered insights into thermal stability and lattice distortions. Cyclic voltammetry (CV) demonstrated quasi-rectangular curves, indicating pseudo-capacitive behaviour with a specific capacitance of 547.3 F/g. The nanocomposites also demonstrated excellent photocatalytic activity, achieving 94% degradation of Rose Bengal and 96% degradation of Fast Green dyes. With outstanding optical, magnetic, electrochemical, and photocatalytic properties, the Sr-doped α-MnO₂ is an auspicious material for energy storage and environmental remediation applications.