Enhanced Pseudocapacitance of the LaNiO3 Perovskite in p‐Phenylenediamine as Redox‐Active Electrolyte


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Perovskite oxides are well known for their excellent properties such as catalytic activity, oxygen ion mobility and structure stability. These properties make it a most suitable material for energy storage devices like fuel cells, batteries and supercapacitors. In the present work, LaNiO3 perovskite was synthesized using the sol-gel method and its morphological parameters were characterized by XRD, SEM and FTIR. The anion-intercalated pseudocapacitive nature of LaNiO3 powder was studied in 2M KOH as well as in the mixture of 2M KOH with p-phenylenediamine (PPD) as an alkaline aqueous and redox-active electrolyte respectively. Electrochemical performance characteristics cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS) of LaNiO3 has shown pseudocapacities of 300.60 Fg(-1) at a scan rate of 5 mV s(-1) and 440 F g(-1) at a current density of 1 A g(-1) in KOH+PPD electrolyte. Furthermore, a symmetrical pseudocapacitor has been fabricated using LaNiO3 as electrode active material with 2M KOH+PPD as an redox-active electrolyte. The device delivered an energy density of 13.75 Wh kg(-1) at the power density of 500 W kg(-1) at a potential of 1 V. This excellent performance may be due to the synergic effect of both redox active electrode (LaNiO3) and electrolyte (KOH+PPD) that together demonstrated a great combination for high performance pseudocapacitors for future applications.
Perovskite,Pseudocapacitor,Sol-gel,Redox-Active,Power density,Energy density
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