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Exploring the Potential of Strontium Substituted High-Entropy Oxides for Supercapacitors and Photocatalytic
Arunaprabha Andipet1, Prince Wesley Vanaraj1, Lokeswaran Ravi1
1High Temperature Materials Processing Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, India.
Inorganic Chemistry
|May 4, 2026
Summary
A novel high-entropy oxide, (CuZnNiCoSr)O, was synthesized for energy storage and environmental applications. This material exhibits excellent catalytic performance, high specific capacitance, and efficient degradation of methylene blue.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- High-entropy oxides (HEOs) are multicomponent ceramics with tunable properties driven by configurational entropy.
- Their unique structures offer potential for advanced applications in energy and catalysis.
Purpose of the Study:
- To synthesize and characterize a novel rocksalt-structured HEO, (CuZnNiCoSr)O.
- To evaluate its potential for energy storage and photocatalytic degradation applications.
Main Methods:
- Reverse coprecipitation method for HEO synthesis.
- Powder X-ray diffraction and Rietveld refinement for structural analysis.
- X-ray photoelectron spectroscopy (XPS) for elemental and redox state analysis.
- Electrochemical testing for specific capacitance and cycling stability.
- Optical measurements for bandgap determination.
- Photocatalytic degradation experiments using methylene blue.
Main Results:
- Phase-pure rocksalt-structured (CuZnNiCoSr)O (Fm-3m, a = 4.24(4) Å) was successfully synthesized.
- XPS revealed redox-active Ni and Co species and oxygen vacancies, enhancing catalytic activity.
- The electrode demonstrated a specific capacitance of 298.67 F g⁻¹ at 1 A g⁻¹ with 96.36% retention after 1000 cycles.
- Optical bandgap showed temperature dependence, decreasing from 3.72 eV to 1.66 eV with increasing calcination temperature.
- 97.39% degradation of methylene blue was achieved in 60 min, with a rate constant of 0.03551 min⁻¹.
Conclusions:
- The synthesized (CuZnNiCoSr)O is a multifunctional material with significant potential for energy storage devices.
- Its exceptional photocatalytic activity makes it suitable for environmental remediation applications.
- This study offers insights into the rational design of HEOs for diverse technological applications.
