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Aryal Krishna Prasad,박종영,정희영,강제우,강순형,안광순 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
A thin film of nickel-intermixed tungsten oxide (Ni-WO3) composite was assembled using a facile onestepelectrochemical deposition method. Equal proportions of Ni(OH)2 and WO3 were used to obtainNi-WO3 thin film and conducted a detail study on electrochromic energy storage properties. The compositefilm exhibited cathodic electrochromic behavior and displayed significantly improved performancecompared to the Ni(OH)2 and WO3 thin films. Assembled Ni(OH)2 and WO3 in composite thin film formeda crosslinked and deagglomerated surface; therefore, both electrochemically active surface area andcharge transfer kinetics were notably enhanced. Highest coloration efficiency (CE) of 68.5 cm2/C, optimumoptical contrast (%DT) of 61, and fast coloration response of 3.9 s were recorded for thin film compositewhile the Ni(OH)2 and WO3 thin films possessed CE values of 41.1 and 46.6 cm2/C, and %DT valuesof 28 and 35, respectively. As an energy storage material, Ni-WO3 exhibited a maximum areal capacitanceof 23.1 mF/cm2, at an applied current of 2 mA. Capacitive retention study showed an excellent retentionof 76.5% even after 2000 charge/discharge cycles. Furthermore, electrochromic performances of Ni-WO3were evaluated with a quantum-dot-sensitized solar cell, in which an applied potential of 1.15 V was sufficientfor coloring the Ni-WO3 thin film.