Effect of carbon carrier pretreatment on oxygen reduction performance of Co-N/C non-platinum catalyst for fuel cell
Xiaohui SUN1,2, Shuhong LIU2, Lu LU2,*(), Jicheng SHI2, Hongfeng XU2,*()
1 School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China 2 Liaoning Key Laboratory of Metal Air New Energy Battery, Dalian Jiaotong University, Dalian 116028, Liaoning, China
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.
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2022, Vol. 50 
), 史继诚2, 徐洪峰2,*(
