Show simple item record

AuthorAshok A.
AuthorKumar A.
AuthorMatin M.A.
AuthorTarlochan F.
Available date2020-03-18T08:10:09Z
Publication Date2018
Publication NameACS Omega
ResourceScopus
ISSN24701343
URIhttp://dx.doi.org/10.1021/acsomega.8b00799
URIhttp://hdl.handle.net/10576/13336
AbstractAg/Co3O4 catalysts using three different modes of solution combustion synthesis were developed and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy to identify crystallite size, oxidation state, composition, and morphology. Cyclic voltammetry and linear sweep voltammetry measurements for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) confirm the bifunctionality of the electrocatalysts. The electrochemical evaluation indicates that a synergic effect between Ag and Co enhances the activity through the fast breaking of O-O bond in the molecular oxygen to enhance the reduction mechanism. The high content of cobalt (Co) in the catalyst Ag/Co3O4-12, synthesized by second wave combustion, improves the activity for ORR, and the reaction mechanism follows a 3.9 number of electron transfer in overall reaction. The kinetic and limiting current densities of Ag/Co3O4-12 are maximum when compared to those of other Ag/Co3O4 catalysts and are very close to commercial Pt/C. Moreover, the maximum current density of OER for Ag/Co3O4-12 makes it a promising candidate for various bifunctional electrocatalytic applications such as fuel cells and metal-air batteries. Copyright ? 2018 American Chemical Society.
SponsorThis publication was made possible by NPRP grant (NPRP8-145-2-066) from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the author(s). The authors also wish to gratefully acknowledge the Gas Processing Centre (GPC) at Qatar University for carrying out XPS analysis and the Central Laboratory Unit (CLU) for services related to electron microscopy.
Languageen
PublisherAmerican Chemical Society
SubjectBifunctional Ag/Co3O4
TitleSynthesis of Highly Efficient Bifunctional Ag/Co3O4 Catalyst for Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Medium
TypeArticle
Pagination7745 - 7756
Issue Number7
Volume Number3
dc.accessType Abstract Only


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record