Here, the monodisperse SiO2@ resorcinol resin microspheres were obtained by sol-gel process. The hollow bowl structure was obtained by HF etching. Then the bowl structure was mixed with cobalt acetate to heat it. Finally, the cobalt modified nitrogen doped carbon bowl (Co@ NCB) nanostructure was prepared. Among them, cobalt exists in Co @ NCB in the form of Co nanoparticles and conn4. The results show that the oxygen reduction performance of Co @ NCB composite is better than that of commercial Pt / C, and its half wave potential and stability are improved. When Co @ NCB is used in zinc air battery, it achieves high open circuit voltage, excellent power density and good stability.
Figure 1. Schematic diagram of synthesis and preparation of Co @ NCB.
Figure 2. (a) SEM, (b) tem, (c) HRTEM, (d) element distribution map corresponding to EDX, (E) spherical aberration corrected STEM map of Co @ NCB.
Figure 3. (a) total spectrum of XPS, (b) high resolution N 1s XPS, (c) high resolution co 2p XPS, (d) N2 adsorption desorption isotherm curve and corresponding bjh pore size distribution.
Figure 4. Orr performance characterization of Co @ NCB, CB, NCB, Co @ ncb-at, Co @ CB and commercial Pt / C (20 wt%) in oxygen saturated 0.1M KOH electrolyte. (a) CV Curve at fixed sweep speed, (b) LSV curve at fixed sweep speed and rotating speed, (c) timing current response curve of Co @ NCB and Pt / C catalyst when methanol is added, (d) long-time timing current response curve.
Figure 5. Performance test of Co @ NCB and Pt / C in zinc air battery. (a) Discharge polarization curve and corresponding power density, (b) constant current discharge curve at 10 and 200 Ma cm-2 current density, respectively.
The research work was published in the Journal chem.commun. By the research group of Mai Liqiang of Wuhan University of technology in 2020. Original: cobalt decorated nitrogen dowed carbon bowls as efficient electronics for the oxygen reduction reaction