Metal–organic framework-derived cobalt hydroxide microparticles as supercapacitor electrode materials

• Published in: Journal of the Iranian Chemical Society Vol. 18; no. 8; pp. 2115 - 2122
• Main Authors: Mohammadi, Samira, Targholi, Ehsan, Mousavi-Khoshdel, S. Morteza
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2021; Springer Nature B.V
• Subjects: Analytical Chemistry; Biochemistry; Capacitance; Chemistry; Chemistry and Materials Science; Cobalt; Current density; Discharge; Electrode materials; Fourier transforms; Infrared analysis; Infrared spectroscopy; Inorganic Chemistry; Metal-organic frameworks; Microparticles; Organic Chemistry; Original Paper; Physical Chemistry; Spectrum analysis; Sulfuric acid; Supercapacitors; Metal–organic framework; Cobalt hydroxide
• ISSN: 1735-207X; 1735-2428
• DOI: 10.1007/s13738-021-02174-3

In this work, cobalt hexacyanoferrate was synthesized by co-precipitation method. Then, cobalt hexacyanoferrate converted to cobalt hydroxide with a simple method, using a 0.2 M NaOH solution. The obtained composition was detected and analyzed by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and energy dispersive x-ray spectroscopy. The results of the identification tests confirmed the successful synthesis of cobalt hexacyanoferrate microparticles as well as cobalt hydroxide microparticles. Electrochemical measurements showed the specific capacitance of 55 F g −1 for cobalt hexacyanoferrate in the current density of 5 A g −1 . The specific capacitance of 510.71 F g −1 at the current density of 6 A g −1 was obtained for cobalt hydroxide. The electrode made of cobalt hexacyanoferrate lost 45% of its initial capacitance after 1,000 continuous galvanostatic charge/discharge cycles at the current density of 1 A g −1 , whereas cobalt hydroxide was able to reach capacitance of 112.60% of own initial capacitance after 5000 continuous galvanostatic charge/discharge at the current density of 6 A g −1 .