Facile synthesis of ZnS decorated N, S co-doped carbon polyhedron as high efficiency oxygen reduction reaction catalyst for Zn-air battery
Abstract
Developing low cost, environmentally friendly and high efficiency oxygen reduction reaction (ORR) electrocatalysts is critical for clean energy conversion and storage devices including fuel cells and metal-air batteries. Herein, we developed a facile method to doping N, S and ZnS into carbon framework simultaneously. The N, S co-doping and extra ZnS active sites could prominently enhance the ORR performance of the carbon. The optimized sample ZnS@NC-3 exhibit an onset potential of 0.94 V and a half-wave potential of 0.84 V, which is comparable to 20 wt% Pt/C. In addition, the methanol tolerance and cycle ability are obvious superior than that of Pt/C. Moreover, when used as electrocatalysts for Zn-air battery, the battery exhibits an open circuit voltage of 1.524 V, a high specific capacity of 736 mA h g-1 and a max power density of 176 mW cm-2, demonstrating its great potential for clean energy conversion.
- Publication:
-
Applied Surface Science
- Pub Date:
- April 2020
- DOI:
- 10.1016/j.apsusc.2020.145367
- Bibcode:
- 2020ApSS..50945367L
- Keywords:
-
- Electrocatalysis;
- Oxygen reduction reaction;
- Porous carbon;
- ZnS;
- Heteroatom doping