Fe, N Doped 2D Porous Carbon Bifunctional Catalyst for Zinc-air Battery

doi:10.15541/jim20180260

Abstract

Abstract:

Fe, N doped 2D porous carbon catalyst was synthesized by pyrolysizing the precursor, ZIF-8, on graphene. Meanwhile, Fe-2,2-bipy were coordinated on ZIF-8. The catalyst was analyzed by SEM, XRD, and XPS for morphology, structure and component. The ORR and OER performance of the Fe, N doped 2D porous carbon catalyst were characterized by RDE, CV curves and LSV curves. It was found that the Fe, N doped 2 D porous carbon catalyst shows uniform 2D structure and that the content of Fe element is 1.32%. The catalyst shows 0.83 V half-wave potentials for oxygen reduction reaction (ORR) in 0.1 mol/L KOH solution and 420 mV over-potential for oxygen evolution reaction (OER) at 10 mA/cm²in 1 mol/L KOH solution. Then, a zinc-air battery was assembled using as-synthesized catalyst. The power density of zinc-air battery is up to 245 mV/cm². Furthermore, it shows superior cycling stability.

Key words: Fe, N doped, 2 D porous materials, bifuncational catalyst, zinc-air battery

CLC Number:

O646

MA Long-Tao, ZHI Chun-Yi. Fe, N Doped 2D Porous Carbon Bifunctional Catalyst for Zinc-air Battery[J]. Journal of Inorganic Materials, 2019, 34(1): 103-108.

Figures/Tables 4

Fig. 1 (a) AFM image and (b) corresponding thickness curves of graphene, (c) SEM image and (d) XRD pattern of Fe, N-doped porous carbon catalyst

Fig. 2 XPS spectra of Fe, N-doped porous carbon catalysts (a) Survey spectrum; (b) C1s; (c) N1s; (d) Fe2p

Fig. 3 (a) CV curves of the Fe, N-doped porous carbon catalyst in a nitrogen- and oxygen-saturated 0.1 mol/L KOH aqueous solution; (b) ORR polarization curves of catalysts recorded at different rotating speed; (c) The K-L plots at different potentials including electron transfer number (n) per oxygen of catalyst; (d) OER polarization curves of catalysts at 1600 r/min in an oxygen-saturated 0.1 mol/L aqueous KOH solution

Fig. 4 (a) Discharge polarization and corresponding power density curves of zinc-air battery using Fe, N-doped porous carbon catalyst; (b) discharge-charge polarization curves of zinc-air battery; and (c) cycling measurements for rechargeability at a current density of 10 mA/cm2

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