Cerium oxide decorated on nickel hydroxide anchored on reduced graphene oxide (Ce-Ni(OH)2/rGO) composite with hexagonal structures were synthesized by facile hydrothermal method. Fourier transform infrared spectroscopy (FT-IR), highresolution transmission electron microscopy with selected area diffraction (HRTEM-SAED), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer– Emmett–Teller (BET) surface area analysis and electrochemical technology were used to characterize the composite. Due to its unique two-dimensional structures and synergistic effect among Ce2O3, Ni(OH)2 and rGO components indicated twodimensional hexagonal nano Ce-Ni(OH)2/rGO composite is promising electrode material for improved electrochemical H2O2 sensing application. From 50 to 800 μM, the H2O2 concentration was linearly proportional to the oxidation current, with a lower detection of limit of 10.5 μM (S/N = 3). The sensor has a higher sensitivity of 0.625 μA μM−1 cm− 2. In addition, the sensor demonstrated high selectivity, repeatability and stability. These findings proved the viability of the synthetic method and the potential of the composites as a H2O2 sensing option.

    Abstract
    1 Introduction
    2 Experimental section
        2.1 Chemicals and reagents
        2.2 Synthesis of Ce-Ni(OH)2 nanocomposite
        2.3 Graphene oxide synthesis by Modified Hummer’s method
        2.4 Anchoring of Ce-Ni(OH)2 on rGO
        2.5 Characterization
        2.6 Electrochemical experiments
        2.7 Fabrication of the working electrode
    3 Results and discussion
        3.1 Characterization of Ce-Ni(OH)2rGO nanocomposite
        3.2 Electrochemical characteristics of Ce-Ni(OH)2rGO nanocomposite
    4 Conclusions
    Acknowledgements 
    References

• S. G. Manjushree(Department of Chemistry, Siddaganga Institute of Technology)
• Prashanth S. Adarakatti(Department of Chemistry, SVM Arts, Science and Commerce College)
• Velu Udayakumar(Department of Chemistry, Siddaganga Institute of Technology, Department of Chemistry, MVJ College of Engineer)
• Abdulraheem S. A. Almalki(Department of Chemistry, Faculty of Science, Taif University)