Fe-N-C combined with Fe 100-x-y-z P x O y N z porous hollow spheres on a phosphoric acid group-rich N-doped carbon as an electrocatalyst for zinc-air battery
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- Fe-N-C combined with Fe 100-x-y-z P x O y N z porous hollow spheres on a phosphoric acid group-rich N-doped carbon as an electrocatalyst for zinc-air battery
- Yuan, Bing; Nam, Gyutae; Li, Ping; Wang, Shuai; Liu, Xien; Cho, Jaephil
- Issue Date
- Elsevier B.V.
- APPLIED SURFACE SCIENCE, v.481, pp.498 - 504
- Replacing the commercial Pt/C with non-precious metal-based electrocatalysts in the proton exchange membrane fuel cells and metal-air batteries is still challenging. Herein, an electrocatalyst (described as Fe-N-C/Fe 100-x-y-z P x O y N z /NPC, NPC is N, P co-doped carbon) composed of multiple active components, such as NPC, iron-based porous hollow spheres and Fe-N-C, is reported, which exhibits an excellent activity that is comparable to state-of-the-art Pt/C for half-cell and full zinc-air battery in alkaline media. This catalyst exhibits an excellent activity with a half-wave potential of 0.86 V for the ORR in alkaline media, which is 10 mV more positive than to that of Pt/C (0.85 V), and a gravimetric energy density for zinc-air battery is up to 675 Wh Kg zn −1 . The excellent activity is attributed to the synergetic effect of active NPC, iron-based porous hollow spheres (Fe 100-x-y-z P x O y N z ) and Fe-N-C in its structure. In addition, phosphoric acid groups are partially remained in the structure for our catalyst that make the catalyst excellent hydrophilicity. This work adds a new member into family of non-precious metal-based ORR electrocatalysts.
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