Most recently, graphene-related composite-modified electrode surfaces are been widely employed to improve surface interactions and electron transfer kinetics. Hydrothermally prepared strontium pyro niobate (SPN) and reduced graphene oxide/ strontium pyro niobate (RGOSPN) nanostructures reveal excellent morphology. X-ray diffraction analysis of SPN and RGOSPN agree with standard data. Thermogravimetry–differential scanning calorimetry analyses show that RGOSPN has higher thermal stability than SPN. In addition, from the polarization–electric field (P–E) loop measurements, the estimated value of remnant polarization (Pr) and coercive electric field (Ec) of SPN are 0.039 μC cm−2 and − 2.90 kV cm−1 and that of RGOSPN nanocomposite are 0.0139 μC cm−2 and − 2.04 kV cm−1. Cyclic voltammetry measurements show that RGOSPN nanocomposite manifests the possibility of electrochemical reversibility beyond long cycles without change in performance. The redox cycle reveal that RGOSPN can be used as part of a composite electrode for hybrid capacitors dynamic conditions. Moreover, the specific capacitance of SPN and RGOSPN was calculated using galvanostatic charge–discharge (GCD) technique. The observed energy density of 9.1 W h kg−1 in RGOSPN is higher when compared with previous reported values.

    Abstract
    1 Introduction
    2 Experimental
        2.1 Materials
        2.2 Synthesis of graphene oxide and strontium pyro niobate
        2.3 Preparation of reduced graphene oxidestrontium pyro niobate nanocomposite
        2.4 Characterization tools
    3 Results and discussion
        3.1 X-ray diffraction analysis
        3.2 Morphological and composition studies
        3.3 Spectral analysis
        3.4 Thermal analysis of GO, SPN and RGOSPN
        3.5 Ferroelectric studies
        3.6 Electrochemical measurement of SPN and RGOSPN
    4 Conclusion
    Acknowledgements 
    References

• M. Infant Shyam Kumar(Department of Physics, Rajalakshmi Engineering College, Faculty of Technology, Anna University)
• S. Shahil Kirupavathy(Department of Physics, Velammal Engineering College)
• S. Shalini(Department of Physics, R.M.D. Engineering College)