| abstract |
The invention discloses a two-dimensional transition metal single-atom catalyst. The catalyst uses a TiN/TiC heterostructure material as a carrier, and the transition metal single atoms are uniformly dispersed on the surface of the TiN/TiC. The invention also discloses a preparation method of the above-mentioned two-dimensional transition metal single-atom catalyst and its application in a lithium-sulfur battery. In the invention, the TiN/TiC heterostructure material is used as the carrier, the single metal atoms are uniformly dispersed on the surface of the carrier TiN/TiC, the loading amount of the single metal atom (tungsten) on the surface of the carrier can reach 4.5%, and the metal single atom is significantly improved. The loading amount on the catalyst carrier provides sufficient active sites for the conversion and catalysis of polysulfides, thereby significantly improving the conversion efficiency and charge-discharge capacity; it is applied to lithium-sulfur batteries, which greatly improves the performance of the sulfur cathode. Discharge specific capacity and rate performance and cycling stability. |