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Ingeniously introducing of boron to adjust hetero-atoms and their bonding with cobalt for improving the catalysis of oxygen reduction reaction.
- Source :
-
Journal of Solid State Chemistry . Sep2020, Vol. 289, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- A novel method of introducing boron element was used to prepare a composite catalyst in which cobalt nanoparticles were embedded in N, B, and S-doped carbon matrix (Co-NBSC). This method can significantly retain the nitrogen content in the catalyst by introducing only a small amount of boron. The bonding ability of cobalt to hetero-atoms was also improved. The optimized bonding patterns between heteroatoms and metal-cobalt have further improved the performance of catalyzing the oxygen reduction reaction (ORR). Electrochemical tests show that the Co-NBSC catalyst possesses an onset potential of 0.93 V, a half wave potential of 0.84 V and a current density of 5.58 mA/cm2 as well as excellent stability in an alkaline solution. In addition, Co-NBSC based zinc-air battery exhibited a power density of 121.2 mW/cm2 and a discharge stability of more than 30 h. The synthesis strategy can provide new ideas for the future development of low cost non-precious metal-carbon catalyst of ORR. Novel method of increasing nitrogen contents through boron, which can effectively to improve the ORR activity. Image 1 • Novel method of increasing nitrogen content via cleverly introducing boron. • This method also promotes the formation of heteroatom-cobalt-carbon bonds. • Increased N-content and optimized bonding patterns improved ORR performances. • Onset potential of ORR was shifted positively and the Tafel slope decreased. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00224596
- Volume :
- 289
- Database :
- Academic Search Index
- Journal :
- Journal of Solid State Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 144935684
- Full Text :
- https://doi.org/10.1016/j.jssc.2020.121523