Abstract
Supercapacitors are attractive as a major energy storage device due to their high coulombic efficiency and semi-permanent life cycle. Transition metal oxides are used as electrode material in supercapacitors due to their high conductivity, capacitance, and multiple oxidation states. Nanopowder transition metal oxides exhibit low specific surface area, ion diffusion, electrical conductivity, and structural stability compared with the three-dimensional (3D) structure. Furthermore, unstable performance during long-term testing can occur via structural transition. Therefore, it is necessary to synthesize a transition metal oxide with a high specific surface area and a stable structure for supercapacitor application. Transition metal oxides with a perovskite structure control structural transition and improve conductivity. In this study, a NiMnO3 perovskite oxide with a high specific surface area and electrochemical properties was obtained via hydrothermal synthesis at low temperature. Hydrothermal synthesis was used to fabricate materials with an aqueous solution under high temperature and pressure. The shape and composition were regulated by controlling the hydrothermal synthesis reaction temperature and time. The synthesis of NiMnO3 was controlled by the reaction time to alter the specific surface area and morphology. The prepared perovskite NiMnO3 oxide with a three-dimensional structure can be used as an active electrode material for supercapacitors and electrochemical catalysts. The prepared NiMnO3 perovskite oxide showed a high specific capacitance of 99.03 F·g−1 and excellent cycle stability with a coulombic efficiency of 77% even after 7000 cycles.
Highlights
The supercapacitor has attracted substantial interest as an alternative energy storage system due to its high power density, rapid charging/discharging process, and semi-permanent cycle life [1,2,3].Supercapacitors can be classified into two types
Three-dimensional NiMnO3 was prepared via one-step hydrothermal synthesis under various reaction times
A nanocube-like NiMnO3 perovskite oxide was fabricated using the hydrothermal method by adjusting the reaction time
Summary
The supercapacitor has attracted substantial interest as an alternative energy storage system due to its high power density, rapid charging/discharging process, and semi-permanent cycle life [1,2,3]. Supercapacitors can be classified into two types. The first type is an electric double-layered capacitor, which can store electric energy via the formation of an electric double layer at the interface between electrode and electrolyte. The second type is a pseudocapacitor based on the redox reaction of the electrode. In spite of the high power density, issues such as lower energy density still inhibit the widespread application of supercapacitors.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
