摘要
The rational exploitation of non-precious metal catalyst with high activity,strong durability and low cost for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of vital importance for metalair batteries.Herein,a composite of Co_(3)O_(4)nanoparticles confined in three-dimensional(3 D)N-doped porous carbon(Co-NpCs)was prepared by a simple freeze-drying and in situ pyrolysis method.The effect of different dosages of Co(NO_(3))_(2)on the catalytic performance was discussed.The Co-NpC-12%exhibits the best catalytic performance(E_(1/2)=0.78 V,better stability than 20%Pt/C)in ORR and in OER among all the as-synthesized samples.Furthermore,it also exhibits the best bifunctional activity(ΔE=0.849 V).The excellent properties of Co-NpCs are mainly due to the synergy between Co_(3)O_(4)and carbon.Firstly,a high Co_(3)O_(4)loading amount can boost the defect level of the N-doped hierarchical porous carbon and expose more active sites.Secondly,the unique in situ pyrolysis guarantees a largearea contact between Co_(3)O_(4)and carbon as well as a strong C-O-Co bonding,which promotes charge transfer,avoids the peeling of Co_(3)O_(4)nanoparticles and effectively improves the stability of the material.This work is expected to offer a feasible strategy to produce metal oxide/carbon nanocomposite and push forward the development of bifunctional electrocatalyst with high activity and stability.
出处
《Rare Metals》
SCIE
EI
CAS
CSCD
2020年第12期1383-1394,共12页
稀有金属（英文版）
基金
the National Natural Science Foundation of China(Nos.51871046,51902046,51874079,51571054,51771046 and 51674068)
the Natural Science Foundation of Liaoning Province(No.201602257)
the Natural Science Foundation of Hebei Province(Nos.E2019501097,E2018501091 and E2020501004)
the Fundamental Research Funds for the Central Universities(Nos.N182304017,N182304015,N172302001 and N172304044)。
