电解质
纳米材料
纳米颗粒
电容
超级电容器
材料科学
电极
相(物质)
电流密度
煅烧
化学工程
分析化学(期刊)
纳米技术
化学
物理
物理化学
催化作用
色谱法
工程类
量子力学
生物化学
有机化学
作者
Arpan Kumar Nayak,T. Gopalakrishnan
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-10-07
卷期号:5 (10): 14663-14676
被引量:7
标识
DOI:10.1021/acsanm.2c03026
摘要
Controlling the phase and crystal structure of nanomaterials is a challenging mission in a wet chemical method and has remarkable importance to the materials properties. Herein, we demonstrate a facile sol–gel method to synthesize Bi2O3, Fe2O3, BiFeO3, Bi36Fe2O57, secondary phase, and mixed phase of BiFeO3 (Bi25FeO40 and Bi2Fe4O9) by tailoring the parameters such as molar concentration, calcination temperature, and duration. Further, all the electrode materials were demonstrated for supercapacitor (SC) application. The pure-phase BiFeO3 nanoparticles show a highest specific capacitance of 253 F/g at a current density of 1 A/g compared to all other electrodes under a 3 M KOH electrolyte. The higher specific capacitance of BiFeO3 nanoparticles is ascribed to their higher surface area, pure ABO3 structure, and lower charge-transfer resistance. Moreover, the BiFeO3 nanoparticles were also tested under a neutral electrolyte (1 M Na2SO4) and found to have 3.7 times lower specific capacitance compared to the alkaline electrolyte (3 M KOH). The electrokinetic study of the as-synthesized active electrodes illustrates the maximum capacitive involvement to store the overall charge. The BiFeO3 nanoparticles display outstanding stability with a retention rate of 99.02% after 1100 consecutive galvanostatic charge–discharge cycles at various current densities. Moreover, a solid-state symmetric SC device (SSD) was fabricated using BiFeO3 nanoparticles. The device delivered a maximum energy density of 17.01 W h/kg at a current density of 1 A/g and a power density of 7.2 kW/kg at a current density of 10 A/g. The BiFeO3 SSD showed an excellent capacitive retention rate of 88% after 5000 cycles, suggesting that it could be a promising electrode material for practical application in energy storage devices.
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