材料科学
碳化
催化作用
纳米晶
化学工程
钴
石墨烯
双金属片
纳米技术
碳纤维
电催化剂
纳米颗粒
兴奋剂
金属
电化学
电极
复合数
复合材料
物理化学
扫描电子显微镜
有机化学
化学
冶金
工程类
光电子学
作者
Changwei Shi,Yuheng Liu,Ruiyu Qi,Jiantao Li,Jiexin Zhu,Ruohan Yu,Shidong Li,Xufeng Hong,Jinsong Wu,Shibo Xi,Liang Zhou,Liqiang Mai
出处
期刊:Nano Energy
[Elsevier]
日期:2021-09-01
卷期号:87: 106153-106153
被引量:73
标识
DOI:10.1016/j.nanoen.2021.106153
摘要
Carbon-supported transition metal catalysts have attracted intense interest for oxygen reduction reaction (ORR) due to their high activity and low cost. Herein, we report bimetallic zeolitic imidazole frameworks (BMZIF)-derived hierarchical N-doped carbon spheres anchored with graphene-encapsulated Co nanocrystals ([email protected]) and spatially isolated single Co atoms (Co SAs) (denoted as Co-NCS) for highly efficient ORR. An ultrasonic strategy has been developed to uniformly anchor BMZIF on resin microspheres. The ultrasonic method significantly shortens the synthesis time and contributes to the homogeneous distribution of BMZIF. The inner resin spheres act as ideal support to anchor Zn/Co ions and prevent the aggregation of BMZIF nanocrystals, and the derived products provide adequate structural support and high conductivity after carbonization. Meanwhile, the outer BMZIF-derived porous carbon framework provides large specific surface area, promoted electron transport, and abundant exposed active sites. The co-existence of Co SAs and [email protected] plays a vital role in the ORR process. The resultant catalyst demonstrates superior ORR performance with a half-wave potential (J1/2) of 0.90 V, outperforming the commercial Pt/C. This work opens a new path to construct efficient Co-N-C based catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI