Abstract
Nickel oxide-titanium dioxide/reduced graphene oxide (NiOTiO2/rGO) nanocomposites were synthesized for the first time using a simple solvothermal method for asymmetric supercapacitor applications. Crystalline NiO and TiO2 nanoparticles were dispersed uniformly on different ratios of rGO multilayers. The specific capacitance was enhanced significantly with an increase in the ratio of rGO. The electrochemical performance of the prepared composites was evaluated in 1.0 M KOH solution. The NTG10 composite showed the highest specific capacitance among all the samples, reaching 793.6 F g−1 at a current density of 5 A g−1 with capacity retention of 89.37% of its initial specific capacitance over 5000 cycles. The suggested electrode achieved a maximum energy density of 33.4 Wh Kg−1 at a power density of 1377 W Kg−1. This enhanced storage performance is attributed to the synergistic combination of NiO, TiO2, and rGO materials which offers superior electrical conductivity, and pseudocapacitive charge-storage mechanisms. The results indicate that NiOTiO2/rGO nanocomposite is a promising electrode material for supercapacitor applications.
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Acknowledgements
We are thankful to the Electronics and Nano Devices Lab, Faculty of Science, South Valley University, Egypt, for giving us access to the facilities and equipment we needed for our research. We also acknowledge the guidance and support of M. I. Elsheikh lab of nanoscience and nanotechnology, Faculty of Science, Sohag University, Egypt, who helped us throughout this project with their expertise and insights. They have been very generous and professional in sharing their knowledge and resources with us and we have learned a lot from them.
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Muhammad Abd El-Monem involved in conceptualization, methodology, validation, formal analysis, investigation, writing—original draft, and visualization. Mohamed Khairy involved in conceptualization, formal analysis, validation, investigation, and writing—review and editing. Khaled G. Mahmoud involved in investigation. M. Abdel Ghany involved in review and editing. A. A. Ebnalwaled involved in supervision, resources, and methodology. E.M.M. Ibrahim involved in conceptualization, validation, formal analysis, investigation, writing—review and editing, project administration, and supervision.
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El-Monem, M.A., Khairy, M., Mahmoud, K.G. et al. Fabrication of nickel oxide-titanium dioxide/reduced graphene oxide nanocomposites for developing asymmetric supercapacitor. J Mater Sci 59, 8987–9002 (2024). https://doi.org/10.1007/s10853-024-09750-x
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DOI: https://doi.org/10.1007/s10853-024-09750-x