• Functionalized dodecyl sulfate ions on Co/Ni hydroxides: synergistic effect on supercapacitor electrode performance

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    • Keywords


      Supercapacitor; metal hydroxides; sodium dodecyl sulfate; sol–gel; electrode.

    • Abstract


      The present investigation highlights the formation of dodecyl sulfate (SDS)-functionalized binary Co/Ni hydroxide using a facile sol–gel method. The effect of (SDS) surfactant ions on hydroxides was studied using X-ray diffraction and Fourier transform infrared spectroscopy. The nanoflakes and their vertically aligned uniform distribution were scrutinized by field-emission electron microscopy, high-resolution transmission electron microscope and atomic force microscopy. The developed metal hydroxides (Co-Ni-SDS) possessed maximum specific capacitance of 2765 F g$^{–1}$ at current density of 5 A g$^{–1}$ with retained capacity of ${\sim}$ 88% after 5000 cycles. An asymmetric solid-state supercapacitor (ASC) device was fabricated with the best possible composition of metal hydroxide as positive and carbon black as negative electrode, which was utilized to brighten a commercial LED (1.8 V, 20 mA) for validation purposes. The efficiency of ASC was evaluated about 283 F g$^{–1}$ by maintaining energy density of 88 Wh kg$^{–1}$.

    • Author Affiliations



      1. Sustainable Energy Laboratory, Department of Metallurgical and Materials Engineering, Defence Institute of Advanced Technology, Pune 411025, India
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