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AuthorNazir, Roshan
AuthorKhalfani, Alanoud
AuthorAbdelfattah, Omnia
AuthorKumar, Anand
AuthorSaleh Saad, Mohammed Ali
AuthorAli, Sardar
Available date2022-09-15T07:07:59Z
Publication Date2020
Publication NameLangmuir
ResourceScopus
URIhttp://dx.doi.org/10.1021/acs.langmuir.0c02554
URIhttp://hdl.handle.net/10576/34054
AbstractThis paper represents a study of mixed Co3O4/CuO nanosheet (NS) synthesis via solution combustion synthesis for oxidation of methanol and carbon dioxide (CO2) conversion. The mixed oxide NS of Co3O4/CuO is a hybrid structure of Co3O4 and CuO NSs. We applied this mixed oxide NS of Co3O4/CuO for methanol oxidation and carbon dioxide (CO2) conversion, and the results revealed that the activity of the mixed oxide NS surpassed the activity of the corresponding individual Co3O4 and CuO metal oxide NSs, both in methanol oxidation and in CO2 conversion. The mass activity of the mixed Co3O4/CuO NS produced at 0.627 V versus Ag/AgCl during methanol oxidation (0.5 M) was 12 mA g-1, which is 2.4 times better than that of Co3O4, whose mass activity is 5 mA g-1, and 4 times better than that of the CuO NS, whose mass activity is 3 mA g-1. The methanol oxidation peak at 0.62 V versus Ag/AgCl was also more intense than individual oxides. The trend in performance of methanol oxidation follows the order: Co3O4/CuO > Co3O4 > CuO. In the case of CO2 reduction, we experienced that our product was formate, and this was proved by formate oxidation (formate is formed as a product during the reduction of CO2) on the surface of the Pt ring of a rotating ring-disc electrode. Similar to methanol oxidation, Co3O4/CuO also showed superior activity in carbon dioxide reduction. It was experienced that at -1.5 V, the current density rises to -24 mA/cm2 for the Co3O4/CuO NS, that is, 0.6 times that of the CuO NS, which is -15 mA/cm2, and 3 times more than that of the Co3O4 NS, which is 8 mA/cm2. The trend in performance of CO2 reduction follows the order: Co3O4/CuO > CuO > Co3O4.
SponsorThe authors would like to gratefully acknowledge the financial support from Total Research & Technology Feluy (Grant Number: QUEX-CENG-TRT-17/18) in conducting this research. Total Research Center Qatar is gratefully acknowledged for the coordination of the project. The statements made herein are solely the responsibility of the authors. We would like to acknowledge the Gas Processing Centre for conducting XRD and XPS analysis; also the SEM and TEM analysis was accomplished in the Central Laboratory Unit, Qatar University.
Languageen
PublisherAmerican Chemical Society
SubjectAlcohols
Electrocatalysts
Oxidation
Oxides
Redox reactions
TitleNanosheet synthesis of mixed Co3O4/CuO via combustion method for methanol oxidation and carbon dioxide reduction
TypeArticle
Pagination12760-12771
Issue Number42
Volume Number36
dc.accessType Open Access


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