Publication:
Supercritical deposition coupled with ammonia treatment: a new route to co-promoted n-doped carbon aerogels with high oxygen reduction reaction activity

dc.contributor.coauthorDeljoo, Bahareh
dc.contributor.coauthorAindow, Mark
dc.contributor.departmentDepartment of Chemical and Biological Engineering
dc.contributor.departmentGraduate School of Sciences and Engineering
dc.contributor.departmentKUYTAM (Koç University Surface Science and Technology Center)
dc.contributor.departmentKUTEM (Koç University Tüpraş Energy Center)
dc.contributor.kuauthorBozbağ, Selmi Erim
dc.contributor.kuauthorErkey, Can
dc.contributor.kuauthorÜnsal, Seçil
dc.contributor.kuauthorYağcı, Mustafa Barış
dc.contributor.schoolcollegeinstituteResearch Center
dc.contributor.schoolcollegeinstituteGRADUATE SCHOOL OF SCIENCES AND ENGINEERING
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.date.accessioned2024-11-09T23:06:48Z
dc.date.issued2019
dc.description.abstractA new highly active family of Co-promoted N-doped carbon aerogel catalysts is prepared by a supercritical CO2-assisted technique combined with NH3 treatment. The active sites are created during the complex transformation of an organic aerogel to a carbon aerogel in the presence of cobalt by NH3 as the source of nitrogen and pyrolysis medium. The mass activity for oxygen reduction reaction (ORR) is highest for the catalyst pyrolyzed at 800 degrees C. The catalyst displays similar activity for ORR as a commercial Pt/C catalyst. Moreover, the catalyst exhibits nearly double the mass activity of N-doped carbon aerogel pyrolyzed at the same temperature. The nature of the active sites for ORR is also investigated by selectively adding or removing various species (i.e., Co-N-x and Co-O) via post acid-base treatments. After removing the Co species from the catalyst, the same activity as the parent catalyst is achieved suggesting that the Co species in the catalyst are spectators in ORR catalysis and they serve only to promote the formation of catalytically active graphitic N sites during pyrolysis in NH3. A strong correlation is found between the relative distribution of graphitic N species and the mass activity.
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.issue11
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuN/A
dc.description.sponsorshipKoc University Surface Science and Technologies Center (KUYTAM)
dc.description.sponsorshipKoc University TuPRAS Energy Center (KUTEM) The authors acknowledge the support of Koc University Surface Science and Technologies Center (KUYTAM) and Koc University TuPRAS Energy Center (KUTEM). The microscopy studies described in this paper were performed using the facilities in the UConn/Thermo Fisher Scientific Center for Advanced Microscopy and Materials Analysis (CAMMA).
dc.description.volume7
dc.identifier.doi10.1002/ente.201900450
dc.identifier.eissn2194-4296
dc.identifier.issn2194-4288
dc.identifier.scopus2-s2.0-85069858286
dc.identifier.urihttps://doi.org/10.1002/ente.201900450
dc.identifier.urihttps://hdl.handle.net/20.500.14288/9039
dc.identifier.wos476110900001
dc.keywordsCarbon aerogels
dc.keywordsCobalt
dc.keywordsN-doped carbon
dc.keywordsOxygen reduction reaction
dc.keywordsSupercritical deposition high electrocatalytic activity
dc.keywordsEfficient electrocatalyst
dc.keywordsGraphene aerogel
dc.keywordsBimetallic nanoparticles
dc.keywordsSupported nanoparticles
dc.keywordsCO/COOX nanoparticles
dc.keywordsCatalytic-activity
dc.keywordsMesoporous carbon
dc.keywordsCathode catalysts
dc.keywordsNitrogen
dc.language.isoeng
dc.publisherWiley-V C H Verlag Gmbh
dc.relation.ispartofEnergy Technology
dc.subjectEnergy
dc.subjectFuel
dc.titleSupercritical deposition coupled with ammonia treatment: a new route to co-promoted n-doped carbon aerogels with high oxygen reduction reaction activity
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorÜnsal, Seçil
local.contributor.kuauthorYağcı, Mustafa Barış
local.contributor.kuauthorBozbağ, Selmi Erim
local.contributor.kuauthorErkey, Can
local.publication.orgunit1GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
local.publication.orgunit1Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM)
local.publication.orgunit1College of Engineering
local.publication.orgunit2Department of Chemical and Biological Engineering
local.publication.orgunit2Graduate School of Sciences and Engineering
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