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Construction of Co,N-Coordinated Carbon Dots for Efficient Oxygen Reduction Reaction
| Content Provider | MDPI |
|---|---|
| Author | Le, Mengying Hu, Bingjie Wu, Meiying Guo, Huazhang Wang, Liang |
| Copyright Year | 2022 |
| Description | For the sake of the oxygen reduction reaction (ORR) catalytic performance, carbon dots (CDs) doped with metal atoms have accelerated their local electron flow for the past few years. However, the influence of CDs doped with metal atoms on binding sites and formation mechanisms is still uncertain. Herein, Co,N-doped CDs were facilely prepared by the low-temperature polymerization–solvent extraction strategy from EDTA-Co. The influence of Co doping on the catalytic performance of Co-CDs was explored, mainly in the following aspects: first, the pyridinic N atom content of Co-CDs significantly increased from 4.2 to 11.27 at% compared with the CDs, which indicates that the Co element in the precursor is advantageous in forming more pyridinic-N-active sites for boosting the ORR performance. Second, Co-CDs are uniformly distributed on the surface of carbon black (CB) to form Co-CDs@CB by the facile hydrothermal route, which can expose more active sites than the aggregation status. Third, the highest graphite N content of Co-CDs@CB was found, by limiting the current density of the catalyst towards the ORR. Composite nanomaterials formed by Co and CB are also used as air electrodes to manufacture high-performance zinc–air batteries. The battery has good cycle stability and realizes stable charges and discharges under different current densities. The outstanding catalytic activity of Co-CDs@CB is attributed to the Co,N synergistic effect induced by Co doping, which pioneer a new metal doping mechanism for gaining high-performance electrocatalysts. |
| Starting Page | 5021 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules27155021 |
| Journal | Molecules |
| Issue Number | 15 |
| Volume Number | 27 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-08-07 |
| Access Restriction | Open |
| Subject Keyword | Molecules Analytical Chemistry Carbon Dots Structure Regulation Co,n-doped Electrocatalysis Oxygen Reduction Reaction |
| Content Type | Text |
| Resource Type | Article |
