Highly effective electrocatalysts are of vital importance for advanced applications. Here we show that fully pi-conjugated dense topological salophen organic frameworks with atomic dispersed tetradentate cobalt sites insitu growth on Kejtenblack are high-efficiency and durable electrocatalyst for the oxygen reduction, with a remarkable half-wave potential of 0.959 V which surpassing that of benchmark Pt/C catalyst, and is among the highest of reported single atom electrocatalysts. The electron transfer number was 3.92-3.99 and the yield of peroxide remains below 4% in 0.40-0.95 V. When employed as a cathode electrocatalyst for zinc-air batteries, it showed a high open-circuit voltage (1.5558 V) and maximum power density (178 mWcm(-2)) and high specific capacity (804 mAhg(zn)(-1)). The work reported here revealed that tailoring the active centers, conjugated structures, building blocks and topologies at atomic level could synergistically enhance the ORR activity which are highly valuable for zinc-air batteries and fuel cells.
Key words
Salphen organic framework/Dense topological framework/Single atom catalyst/Oxygen reduction reaction/Zinc-air battery/CATALYST/METAL/CARBON/MASOFS/H2O2
NSTL
Elsevier