Hybrid electrocatalyst of CoFe2O4 decorating carbon spheres for alkaline oxygen evolution reaction. Issue 4 (15th February 2022)

• Record Type: Journal Article
• Authors: Alhakemy, Ahmed Zaki; Elseman, Ahmed Mourtada; Fayed, Moataz G.; Ahmed Amine Nassr, Abu Bakr; El-Hady Kashyout, Abd; Wen, Zhenhai
• Is Part Of: Ceramics international. Volume 48:Issue 4(2022)
• Page Start: 5442
• Page End: 5449
• Publication Date: 2022-02-15
• Subjects: CoFe2O4 -- Carbon spheres -- Oxygen evolution reaction (OER) -- And alkaline water splitting; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.088
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The exploration of highly effective, durable, and affordable electrocatalysts for the oxygen evolution reaction (OER) is vital in developing an alkaline electrolyzer for H2 generation. Although binary transition metal oxides, particularly spinel ferrites with a general chemical formula MFe2 O4, are a promising class of candidates for OER, their intrinsically low electrical conductivity has a significant negative impact on their electrochemical performances. Herein, we report a simple one-step method for tailoring carbon spheres (CSs) with CoFe2 O4 (CFO) to form a CFO@CSs composite as a cost-effective electrocatalyst. The as-synthesized CFO@CSs features a high specific surface area of 56.94 m 2 /g and exhibits decently high OER catalytic activity with a relatively small overpotential of 390 mV at 10 mA/cm 2, fast kinetics, and high durability in alkaline medium. Moreover, the pairing of the bare Ni mesh electrode as the cathode and the CFO@CSs on Ni mesh as the anode is set up to illustrate its feasibility for the overall alkaline water splitting. This study offers a cost-effective electrocatalyst for OER that can be used instead of precious metals in various renewable energy storage and conversion applications. Graphical abstract: CoFe2 O4 @carbon spheres nanohybrid (CFO@CSs) electrocatalyst was successfully prepared with a facile one-step solvothermal method, which shows excellent electrocatalytic OER performance with low overpotentials of 390 mV at 10 mA cm −2 OER. The assembled system CFO@CSs/NM||bare NM also shows good catalytic performance and excellent stability of the overall water splitting in alkaline media. Image 1