期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 964, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.171303
关键词
Prussian blue analogs; Cerium-cobalt hexacyanoferrate; Cobalt hexacyanoferrate; Coprecipitation method; Supercapacitors
This article describes the fabrication and characterization of a ternary Prussian blue analog-based electrode material for supercapacitors, which exhibits improved specific capacity and cycling stability in alkaline and neutral environments. The fabricated electrode also demonstrates improved energy and power density in a symmetric supercapacitor device.
Supercapacitors are energy storage devices with remarkable properties including high power density, prolonged operational life, and hasty charging/discharging profile; however, a primary barrier to broad development is reduced energy density. Consequently, efforts have been undertaken to fabricate supercapacitors electrodes that resemble battery-type behavior. Owing to the unique structural characteristics and redox active sites, Prussian blue analogs (PBAs) are becoming attractive electrode materials. Herein, we presented the fabrication of ternary PBA-based electrode i.e., cerium cobalt hexacyanoferrate (CeCoHCF) with improved electrical properties and their characterization through different analytical techniques (SEM, FTIR, EDX, XPS, and XRD). The incorpo-ration of cerium and cobalt together in PBA framework imparts a positive effect on the electrochemical prop-erties. The as-synthesized CeCoHCF exhibits a significant specific capacity of 268.8 mA h g-1 at 1 A g-1 under alkaline conditions (3 M KOH) along with 88.6 % of capacity retention over 1000 cycles. Furthermore, the fabricated electrode exhibited the specific capacity 159.4 mA h g-1 at 1 A g-1 in neutral media (1 M Na2SO4). To investigate the practical application, symmetric supercapacitor device was fabricated that provides improved energy and power density as well as a wide operational voltage of around 1.2 V. Conclusively, PBA-based ma-terial can be potential candidates for future storage applications, owing to their outstanding electrochemical performance, chemical resilience, simplicity of synthesis, and low cost.
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