Cobalt and nickel ferrites based capacitive deionization electrode materials for water desalination applications. (10th December 2020)

• Record Type: Journal Article
• Authors: Hai, Abdul; Alqassem, Bayan; Bharath, G.; Rambabu, K.; Othman, Israa; Abu Haija, Mohammad; Banat, Fawzi
• Is Part Of: Electrochimica acta. Volume 363(2020)
• Publication Date: 2020-12-10
• Subjects: Ferrites -- Sol-gel -- Desalination -- Capacitive deionization (CDI) -- Supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.137083
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Co, Ni & Co-Ni mixed ferrites were developed as novel CDI electrode materials. Co0.5 Ni0.5 -Fe2 O4 showed high specific capacitance of 255 F/g than pure ferrites. NaCl electrosorption capacity of 21.84 mg/g & good reusability for Co0.5 Ni0.5 -Fe2 O4 . Co0.5 Ni0.5 -Fe2 O4 is a potential CDI electrode material for desalination application. Abstract: Capacitive deionization (CDI) is an emerging technology for water desalination and is based on electrosorption of ions onto surfaces of electrically charged electrodes. The CDI electrode materials play a significant role in determining the process efficiency. In this study, pure and mixed nickel-cobalt ferrites Cox Ni1-x Fe2 O4 (x = 0.0, 0.3, 0.5, 0.7 and 1.0) were synthesized using the sol-gel auto-combustion method and investigated as novel CDI electrode materials. The purity, structure, and morphology of the synthesized ferrite nanoparticles were analyzed by various techniques. The electrochemical performance of the synthesized materials was investigated, and the results showed that the mixed ferrite Co0.5 Ni0.5 Fe2 O4 electrode possessed the highest specific capacitance of 255 F/g at a scan rate of 10 mV/s. The electrodes were used to treat 250 mg/L NaCl solution in a CDI cell at 1.2 V and a feed flow rate of 10 mL/min. Under optimized experimental conditions, the highest specific salt adsorption capacity was 21.84 mg/g, corresponding to 23.43% of NaCl removal efficiency. These electrodes were highly stable and easily regenerable with less than 5% loss in electrosorption capacity for six adsorption/desorption cycles. The recyclability, stability, and enhanced electrochemical performance of the fabricated electrodes establish cobalt-nickel ferrites as a promising material for use in CDI desalination application. Graphical abstract: Image, graphical abstract