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<p>Cerium oxide (CeO<sub>2</sub>) and Nickel oxide (NiO) nanoparticles were synthesized via chemical precipitation route and characterized using different techniques such as XRD, TEM, FTIR, and UV–Vis spectroscopy. XRD confirmed single-phase, face-centered cubic (fcc) structure with average crystallite sizes as in the range around 65 and 70&#xa0;nm for CeO<sub>2</sub> and NiO, respectively. FTIR spectra displayed characteristic metal oxide vibrations at 837 and 815&#xa0;cm<sup>−1</sup>, although Tauc plot analysis revealed the band gaps approximately at 2.2 and 2.3&#xa0;eV for CeO<sub>2</sub> and NiO, respectively. Electrochemical studies were demonstrated in 2&#xa0;M KOH electrolyte which offered specific capacitances values 75.64 and 174.32 F/g for CeO<sub>2</sub> and NiO at 1 A/g, with coulombic efficiencies value of 97% and 96% retained over 2000 cycles. The enhanced pseudocapacitive performance is attributed to the stable valence states of Ce and Ni, highlighting their promise as the potential electrode materials for efficient supercapacitors.</p>

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Facile three-step chemical synthesis of cubic CeO2 and NiO nanoparticles for efficient energy storage applications

  • 期刊论文

  • 发表日期：

    2026年2月15日

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  • Ravi Renuka Devi,
  • Sethuramachandran Thanikaikarasan,
  • Nagesh Sarojini Devi,
  • Rekha Pachaiappan,
  • Karuppiah Sundaram

摘要

Cerium oxide (CeO2) and Nickel oxide (NiO) nanoparticles were synthesized via chemical precipitation route and characterized using different techniques such as XRD, TEM, FTIR, and UV–Vis spectroscopy. XRD confirmed single-phase, face-centered cubic (fcc) structure with average crystallite sizes as in the range around 65 and 70 nm for CeO2 and NiO, respectively. FTIR spectra displayed characteristic metal oxide vibrations at 837 and 815 cm−1, although Tauc plot analysis revealed the band gaps approximately at 2.2 and 2.3 eV for CeO2 and NiO, respectively. Electrochemical studies were demonstrated in 2 M KOH electrolyte which offered specific capacitances values 75.64 and 174.32 F/g for CeO2 and NiO at 1 A/g, with coulombic efficiencies value of 97% and 96% retained over 2000 cycles. The enhanced pseudocapacitive performance is attributed to the stable valence states of Ce and Ni, highlighting their promise as the potential electrode materials for efficient supercapacitors.