文摘
A series of catalysts (g-C3N4@MWCNTs/Mn3O4) were prepared from g-C3N4, MWCNTs, and Mn3O4 for oxygen reduction reaction (ORR) in zinc–air batteries. From the half-cell tests, the loading of 35 % Mn3O4 (sample GMM35) presents an excellent activity toward ORR in alkaline condition. Rotating ring-disk electrode (RRDE) studies reveal that 3.6∼3.8 electrons are transferred with a H2O2 yield of 11.4 % at −0.4 V. Meanwhile, the GMM35 nanocomposite exhibits the same durability as commercial 20 wt% Pt/C in alkaline condition, but it shows lower peak power density (192.4 mW cm−2 at 229.1 mA cm−2) and cell voltage than those with a commercial Pt/C catalyst (260.9 mW cm−2 at 285.4 mA cm−2).