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AuthorAshok, Anchu
AuthorKumar, Anand
AuthorMatin, Md.
AuthorTarlochan, Faris
Available date2020-05-14T09:55:41Z
Publication Date2019
Publication NameJournal of Electroanalytical Chemistry
ResourceScopus
ISSN15726657
URIhttp://dx.doi.org/10.1016/j.jelechem.2019.05.016
URIhttp://hdl.handle.net/10576/14795
AbstractBi-metallic silver-copper nanoparticles were synthesized using two modes of combustion synthesis, known as Solution Combustion Synthesis (SCS) and Second Wave Combustion Synthesis (SWCS) to enhance surface alloying in Cu and Ag. The alloying in Ag and Cu nanoparticles was found to affect the adsorption of the oxygen molecule and synergistically increases the relative activity towards ORR and OER in 1 M KOH medium. The catalyst sample AgCu-21, synthesized by the SWCS showed highest activity and stability due to high concentration of Ag-Cu alloy on surface as verified by XPS, TEM and phase mapping of elements on the surface. The ORR catalyzed by AgCu-21 proceed through an overall four-electron pathway with a kinetic current density of 12.4 mA cm?2 at ?0.2 V potential. The XPS analysis of the samples indicates that the ORR and OER activity correlate well with the shifting in binding energy of Ag on Cu surface with higher degree of alloying resulting in better electrocatalytic performance. - 2019 Elsevier B.V.
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) and Central Laboratory Unit (CLU) at Qatar University, and Qatar Environment and Energy Research Institute (QEERI) at Qatar Foundation for services related to XPS, SEM/TEM and STEM-HAADF-EDS analyses, respectively. Appendix A
Languageen
PublisherElsevier B.V.
SubjectAlloying
Oxygen evolution
Oxygen reduction reaction
Second wave combustion synthesis
Silver copper electrocatalysis
TitleProbing the effect of combustion controlled surface alloying in silver and copper towards ORR and OER in alkaline medium
TypeArticle
Pagination66-77
Volume Number844
dc.accessType Abstract Only


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