期刊
APPLIED SURFACE SCIENCE
卷 487, 期 -, 页码 1049-1057出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.05.182
关键词
Oxygen reduction reaction; Metallic cobalt; Zinc oxide; N-doped carbon; Carbon nanotubes
类别
资金
- National Natural Science Foundation of China [21706010]
- Natural Science Foundation of Jiangsu Province of China [BK20161200]
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University [ACGM2016-06-02, ACGM2016-06-03]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education of China [ARES-2018-09]
In this work, a series of metallic Co-ZnO encapsulated in N-doped carbon/carbon nanotubes (Co-ZnO@NC/CNT-T) for the electrochemical oxygen reduction reaction (ORR) were synthesized by annealing bimetallic metal-organic frameworks (MOFs) containing Co and Zn in N-2 atmosphere. Within the hybrid, metallic Co was integrated with ZnO and encapsulated by NC, while coral-like CNTs grew out of the obtained Co-ZnO@NC nanoparticles. When applied in ORR catalysis, the optimized Co-ZnO@NC/CNT-700 obtained in 700 degrees C displayed a half-wave potential of similar to 0.86 V and a limiting current density of similar to-5.98 mA cm(-2), which were even superior to 20 wt% Pt/C. Further results demonstrated that the presence of ZnO was closely related with the high ORR catalytic activity from two aspects. (i) ZnO catalyzed the formation of Co-0, Co2+, pyridinic and graphitic N as the main active species for ORR. (ii) ZnO promoted the growth of CNTs and micro/mesoporous structure, which improved the electrochemical active surface area (ECSA) and mass transfer during the ORR process.
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