In this investigation, we synthesized a novel quaternary nanocomposite, denoted as RGO-Ba(OH)2/CeO2/TiO2, through a straightforward and cost-effective solid-state synthesis approach. The as-prepared composites underwent a series of comprehensive characterizations, including XRD, FTIR, TGA-DTA, XPS, SEM, EDAX, and TEM analyses, affirming the successful synthesis of a quaternary nanocomposite with well-interconnected nanoparticles, nanorods, and sheet-like structures. Further, our electrochemical performance evaluations demonstrated that the electrochemical capacitance of the RGO-Ba(OH)2/CeO2/ TiO2 nanocomposite achieved an impressive value of 445 F g− 1 at a current density of 1.0 A g− 1, particularly when the mass ratio of CeO2 and TiO2 was maintained at 90:10. Furthermore, the specific capacitance retained a remarkable 65% even after 2000 cycles at a current density of 6 A g− 1 in a 3 mol KOH electrolyte. Comparatively, this outstanding electrochemical performance of the RGO-Ba(OH)2/CeO2/TiO2 (90:10) nanocomposite can be attributed to several factors. These include the favorable electrical conductivity and large specific surface area provided by graphene, TiO2, and Ba(OH)2, the enhanced energy density and extended cycle life resulting from the presence of CeO2, and the synergistic contributions among all four components. Therefore, the RGO-Ba(OH)2/CeO2/TiO2 nanocomposite emerges as a highly promising electrode material for supercapacitors.

Solid-state synthesis of the RGO-Ba(OH)2CeO2TiO2 novel electrode for energy storage performance
    Abstract
    1 Introduction
    2 Materials and methods
    3 Results and discussion
    4 Conclusion
    Acknowledgements 
    References

• Sreenivasa Kumar Godlaveeti(Department of Materials Science and Nanotechnology, Yogi Vemana University, Y.S.R. Kadapa, AP, India 516005, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)
• Sai Kumar Arla(Department of Mechanical Engineering, Yeungnam University, Gyeongsan‑si, South Korea 38544)
• Adinarayana Reddy Somala(Department of Materials Science and Nanotechnology, Yogi Vemana University, Y.S.R. Kadapa, AP, India 516005)
• Sambasivam Sangaraju(National Water and Energy Center, United Arab Emirates University, Al Ain 15551, UAE)
• Asma A. Alothman(Department of Chemistry, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia)
• Mohammed Mushab(Department of Chemistry, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia)
• Ramamanohar Reddy Nagireddy(Department of Materials Science and Nanotechnology, Yogi Vemana University, Y.S.R. Kadapa, AP, India 516005)
• Gopal Ramalingam(Quantum Materials Research Lab (QMRL), Department of Nanoscience and Technology, Alagappa University, Karaikudi 630003, India)