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Seda Polat,Gülten Atun 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The high capacitive, cost-effective, non-toxic nickel–cobalt layered double hydroxide nanofoampseudocapacitive electrode materials doped with aluminium (NiCoAl-LDH) have been hydrothermallysynthesized on the electrochemically modified graphite (G) substrate with zinc and copper (Zn/G and Cu/Zn/G). The Al3+ diffusion in the LDH during the hydrothermal synthesis resulted in an ultrathin nanofoammorphological structure well adapted to the entire surface of Zn/G and Cu/Zn/G. The high arealcapacitance of the best efficient NiCoAl-LDH/Cu/Zn/G electrode of 2.17 F cm 2 at 5 mA cm 2 decreases to1.83 mF cm 2 at 75 mA cm 2 showing an excellent rate capability of 84%. An asymmetric supercapacitor(ASC) designed with graphite as negative electrode exhibits an energy density of 29.3 Wh kg 1 at a powerdensity of 575 W kg 1. It still remains at 5.6 Wh kg 1 at a higher power density of 3477 W kg 1 at adischarge time of 5.8 s indicating ultra-fast energy storage ability of the G//NiCoAl-LDH/Cu/Zn/G device. Its cyclic tests were also made by constructing a coin-cell-type device for industrial applications. Thecapacitance of the coin-cell operating within 1.6 V was protected around 100% even after over 10,000charge–discharge cycles at the current densities up to 1.8 mA cm 2.