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Ni(OH)2 Nanoparticles Anchored on Laser- and Alkali-Modified TiO2 Nanotubes Arrays for High-Performance Supercapacitor Application

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Abstract

A simple and effective approach of dual modification of TiO2 nanotubes (T-NTs) to boost the electronic and electrochemical properties of T-NTs is demonstrated. The T-NTs were doubly modified using alkali treatment and laser irradiation (Na/Las/T-NTs), which led to a fourfold enhancement in capacitance compared to plain T-NTs. Impedance and Mott Schottky analysis showed that the enhanced capacitive performance of the doubly modified T-NTs electrode was due to a decrease in charge transfer resistance by nearly 3 times, a higher charge carrier density value by 1 order of magnitude caused by improved conductivity (alkali treatment), and increased surface area and hydrophilicity (laser irradiation). The Na/Las/T-NTs were then electrodeposited with Ni(OH)2 nanoparticles (Ni-NPs) to further improve the supercapacitive performances. Ni-NPs electrodeposited on the Na/Las/T-NTs substrate exhibited a high specific capacitance value of 108 mF/cm2 (268 mF/g) at a current density of 0.08 mA/cm2. In addition, the substrate had an energy density of 4.7 µWh/cm2 at a power density of 2 mW/cm2 . showing an efficient charge storage capacity compared to most previously reported TiO2 s-based supercapacitors. Furthermore, the proposed supercapacitor possessed an excellent cyclic and electrochemical stability after 6000 cycles with nearly 88% capacitive retention and 90% coulombic efficiency. Overall, the doubly modified T-NTs surface favors improved electronic contact of Ni-NPs that promotes a more feasible electro-redox reaction at the electrode–electrolyte interface, and thereby demonstrates an effective approach to enhance the performance of supercapacitors.

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Acknowledgments

Authors are grateful to Birla Institute of Technology and Science, Pilani, Hyderabad Campus, India for funding this research project. The work was financially supported by Science and Engineering Research Board grant no. SRG/2019/001378 and by Additional Competitive Research grant no. 912 from the Birla Institute of Technology and Science, Pilani, Hyderabad Campus. The authors also like to extend their sincere appreciation to electronics materials and devices lab, Central Analytical Lab for their immense support in completing the work successfully.

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  1. Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, 500078, India

    Sarda Sharma, P. N. Sidhartha & Karumbaiah N. Chappanda

  2. Department of Electronics and Communication Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Bengaluru Campus, Bengaluru, 560035, India

    Sarda Sharma

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Sharma, S., Sidhartha, P.N. & Chappanda, K.N. Ni(OH)2 Nanoparticles Anchored on Laser- and Alkali-Modified TiO2 Nanotubes Arrays for High-Performance Supercapacitor Application. J. Electron. Mater. 52, 483–499 (2023). https://doi.org/10.1007/s11664-022-10016-y

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