Effect of template size on the synthesis of mesoporous carbon spheresand their supported Fe-based ORR electrocatalysts

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DOIResolve DOI: http://doi.org/10.1016/j.electacta.2013.07.037
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TypeArticle
Journal titleElectrochimica Acta
ISSN0013-4686
Volume108
Pages814819; # of pages: 6
SubjectCatalyst deposition; Mesoporous carbon; Mesoporous carbon supports; ORR electrocatalysts; Oxygen reduction reaction; Support materials; Template effects; Ultrasonic spray pyrolysis; Carbon; Catalyst activity; Catalyst supports; Electrocatalysts; Electrolytic reduction; Model predictive control; Proton exchange membrane fuel cells (PEMFC); Spray pyrolysis; Synthesis (chemical); Mesoporous materials
AbstractThree mesoporous carbon spheres (MPCs) are synthesized using three different templates with sizes of22, 35 and 50 nm, respectively. These three MPC materials are then used as catalyst supports to formthree catalysts (Fe-N X/MPC22, Fe-NX/MPC35, and Fe-NX/MPC50) for oxygen reduction reaction (ORR).SEM images show that after catalyst deposition on the synthesized mesoporous carbon, the sphericalmorphology of mesoporous carbon is well maintained. EDX measurements show that the average Fecontent in the formed mesoporous carbon supported catalysts is very close to the initial synthesis valueof 5 wt%. BET and linear scanning voltammetry are used for characterizing the surface area and electro-chemical properties of the synthesized MPC support materials to study the effect of template size (orpore size). The results show that mesoporous carbon with template size of 50 nm has the largest BETsurface area (2125 m2/g). The measurement results show that all ORR activities of these three MPC sup-ported catalysts are higher than that of commercially available carbon supported one, demonstratingthe advantage of MPC support. Among these three catalysts, the performance order is Fe-N X/MPC50 > Fe-NX/MPC35 > Fe-NX/MPC22, showing the effect of template size on the ORR activity of the catalyst, i.e., theORR activity increases when the template size (or MPC pore size) is increased. The results also clearlyindicate that the mesopores in the range of 22-50 nm can still affect the ORR activity, suggesting thatmesopores are also important in the formation of ORR active sites besides micropores. © 2013 Published by Elsevier Ltd.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21269862
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Record identifier75f993a4-ceeb-4a99-9ad8-ac2ea29e980b
Record created2013-12-13
Record modified2016-05-09
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