Unique multi-phase Co/Fe/CoFe2O4 by water–gas shift reaction, CO oxidation and enhanced supercapacitor performances

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2016, 43(0), , pp.69-77
• Main Authors: Lee, Seungwon, Kang, Jung-Soo, Leung, Kam Tong, Lee, Wondoo, Kim, Dongyun, Han, Seungyoon, Yoo, Wonjun, Yoon, Hee Jung, Nam, Kyusuk, Sohn, Youngku
• Format: Article
• Language: English
• Subjects: CO oxidation; Co/Fe/CoFe2O4; Multi crystal-phase; Supercapacitor; Water–gas shift reaction; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2016.07.049

[Display omitted] •Unique multi-phase Co/Fe/CoFe2O4 was induced by water–gas shift reaction.•Co3O4/CoFe2O4 structures were prepared by thermal annealing and CO oxidation.•Co-rich Co/Fe/CoFe2O4 showed higher WGS reaction activity than the Fe-rich sample.•Co-rich Co/Fe/CoFe2O4 showed 4–20× superior supercapacitor performance than the Fe-rich sample and Co–Fe oxides.•Fe-rich Co/Fe/CoFe2O4 showed 3× higher magnetization than the Co-rich sample. The design of bimetallic Co–Fe oxide structures has attracted considerable research attention in magnetic, electrochemical and catalyst materials. This paper reports the production of unique multi crystal-phase Co/Fe/CoFe2O4 by the water–gas shift reaction. The metallic Co and Fe lower the interfacial resistance, resulting in facial charge/ion transport and a dramatic enhancement in the specific capacitance. The multi-phase Co–Fe oxide structures are also found to be applicable to the water–gas shift reaction and CO oxidation. The unique water–gas shift reaction-induced method can be very useful to the design of highly efficient new multi crystal-phase nanostructures.