Effect of carbon carrier pretreatment on oxygen reduction performance of Co-N/C non-platinum catalyst for fuel cell

Cobalt (Co) based oxygen reduction catalysts have become one of the important choices to replace platinum based oxygen reduction catalysts because of their low price, high reserves and easy availability. ECP600 JD was pretreated with nitric acid, mixed with cobalt acetate tetrahydrate, and then pyro...

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Published inCai liao gong cheng = Journal of materials engineering Vol. 50; no. 9; pp. 52 - 58
Main Authors Sun, Xiaohui, Liu, Shuhong, Lu, Lu, Shi, Jicheng, Xu, Hongfeng
Format Journal Article
LanguageChinese
English
Published Beijing Beijing Institute of Aeronautical Materials 01.09.2022
Journal of Materials Engineering
Subjects
Acidification
Ammonia
Catalysts
Chemical reduction
Cobalt acetates
ecp600 jd
Electron transfer
fuel cell
Fuel cells
Functional groups
Heat treatment
Infrared radiation
Nitric acid
non-platinum catalyst
oxygen reduction reaction
Oxygen reduction reactions
Platinum
Pore size
Pretreatment
Reaction kinetics
Termites
Titration
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Summary:Cobalt (Co) based oxygen reduction catalysts have become one of the important choices to replace platinum based oxygen reduction catalysts because of their low price, high reserves and easy availability. ECP600 JD was pretreated with nitric acid, mixed with cobalt acetate tetrahydrate, and then pyrolyzed at 800 ℃ in ammonia atmosphere to prepare Co-N/C oxygen reduction catalyst. The infrared spectrum test, alkali neutralization titration and specific surface area measurement show that the number of oxygen-containing functional groups on the surface of ECP600 JD increases, the pore size of ECP600 JD remains unchanged, but the proportion of mesopores increases after nitric acid acidification pretreatment. XRD and TEM tests show that Co5.47N is formed from ECP600 JD and cobalt acetate tetrahydrate after ammonia heat treatment, the Co-N/C catalyst is dispersed evenly without agglomeration. Electrochemical tests show that after pretreatment, the electrocatalytic performance of the prepared Co-N/C catalyst for oxygen reduction reaction (ORR) is better. Under alkaline conditions, the current density reaches 4.2 times that before pretreatment, and belongs to four electron transfer in catalytic kinetics.
ISSN:1001-4381
DOI:10.11868/j.issn.1001-4381.2021.001081