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<p>The urgent need for sustainable energy solutions has driven significant innovation in advanced energy storage technologies. Among various candidates, transition metal oxides with spinel crystal structures have attracted considerable attention owing to their unique structural advantages, including strong metal-oxygen coordination that promotes both electronic conduction and mechanical stability. This work reports the pioneering synthesis of Zinc-Cerium oxide (ZnCe<sub>2</sub>O<sub>4</sub>) through a sol-gel approach, representing the first known fabrication of this ternary spinel compound. Structural characterization revealed a phase-pure tetragonal conturation (space group P4/ncc) through Rietveld analysis, while vibrational spectroscopy identified characteristic Zn-O and Ce-O bonding signatures. Thermal studies confirmed the material’s stability up to 500&#xa0;°C, with Electron microscopy revealed an aggregated spherical particle morphology. Electrochemical evaluation demonstrated exceptional charge storage capabilities, with the ZnCe<sub>2</sub>O<sub>4</sub> electrode achieving 131&#xa0;F/g at 0.2&#xa0;A/g in three-electrode testing. When configured in an asymmetric device with carbon C72 (ZnCe<sub>2</sub>O<sub>4</sub>||C72), the assembly maintained 32&#xa0;F/g with remarkable cycling durability (80% capacity retention after 5000 cycles) and perfect charge efficiency. This performance stems from synergistic effects between the spinel’s robust framework and the conductive carbon network, which together facilitate both Faradaic and capacitive charge-storage mechanisms. Thereby positioning ZnCe<sub>2</sub>O<sub>4</sub> as a compelling candidate for next-generation supercapacitor technologies.</p> Graphical abstract <p></p>

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Electrochemical insights into ZnCe2O4 spinel as a novel electrode material for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • R. Saranya,
  • B. Nalini,
  • P. Sakthivel,
  • P. Christopher Selvin

摘要

The urgent need for sustainable energy solutions has driven significant innovation in advanced energy storage technologies. Among various candidates, transition metal oxides with spinel crystal structures have attracted considerable attention owing to their unique structural advantages, including strong metal-oxygen coordination that promotes both electronic conduction and mechanical stability. This work reports the pioneering synthesis of Zinc-Cerium oxide (ZnCe2O4) through a sol-gel approach, representing the first known fabrication of this ternary spinel compound. Structural characterization revealed a phase-pure tetragonal conturation (space group P4/ncc) through Rietveld analysis, while vibrational spectroscopy identified characteristic Zn-O and Ce-O bonding signatures. Thermal studies confirmed the material’s stability up to 500 °C, with Electron microscopy revealed an aggregated spherical particle morphology. Electrochemical evaluation demonstrated exceptional charge storage capabilities, with the ZnCe2O4 electrode achieving 131 F/g at 0.2 A/g in three-electrode testing. When configured in an asymmetric device with carbon C72 (ZnCe2O4||C72), the assembly maintained 32 F/g with remarkable cycling durability (80% capacity retention after 5000 cycles) and perfect charge efficiency. This performance stems from synergistic effects between the spinel’s robust framework and the conductive carbon network, which together facilitate both Faradaic and capacitive charge-storage mechanisms. Thereby positioning ZnCe2O4 as a compelling candidate for next-generation supercapacitor technologies.

Graphical abstract