Efficient spinel iron-cobalt oxide/nitrogen-doped ordered mesoporous carbon catalyst for rechargeable zinc-air batteries

doi:10.1016/S1872-2067(20)63752-4

Abstract

Abstract:

A robust oxygen-related electrocatalyst, composed of spinel iron-cobalt oxide and nitrogen-doped ordered mesoporous carbon (NOMC), was developed for rechargeable metal-air batteries. Electrochemical tests revealed that the optimal catalyst Fe_0.5Co/NOMC exhibits superior activity with a half-wave potential of 0.89 V (vs. reversible hydrogen electrode) for the oxygen reduction reaction and an overpotential of 0.31 V at 10 mA cm^-2 for the oxygen evolution reaction. For demonstration, the catalyst was used in the assembly of a rechargeable zinc-air battery, which exhibited an exceptionally high energy density of 820 Wh kg^-1 at 100 mA cm^-2, a high power density of 153 mW cm^-2at 1.0 V, and superior cycling stability up to 432 cycles (144 h) under ambient air.

Key words: Oxygen-related catalyst, Oxygen evolution reaction, Oxygen reduction reaction, Spinel oxide, Zinc-air battery

He-lei Wei, Ai-dong Tan, Shu-zhi Hu, Jin-hua Piao, Zhi-yong Fu. Efficient spinel iron-cobalt oxide/nitrogen-doped ordered mesoporous carbon catalyst for rechargeable zinc-air batteries[J]. Chinese Journal of Catalysis, 2021, 42(9): 1451-1458.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63752-4

https://www.cjcatal.com/EN/Y2021/V42/I9/1451

Figures/Tables 8

Fig. 1. (a) Schematic illustration of the synthesis protocol of FexCo/NOMC; (b) Nitrogen ad/de-sorption isotherms and (c) XRD patterns of all the samples; (d) M?ssbauer spectroscopy of Fe0.5Co/NOMC.

Fig. 2. (a) TEM image and b) corresponding particle size distribution diagram of Fe0.5Co/NOMC; (c) Size distribution of all the samples; (d?f) Elemental mapping images of Fe0.5Co/NOMC.

Fig. 3. XPS survey spectra of Fe/NOMC, Fe2Co/NOMC, FeCo/NOMC, Fe0.5Co/NOMC and Co/NOMC.

Fig. 4. High-resolution XPS spectra of Fe 2p peak and peak fitting result of (a) Fe/NOMC, (b) Fe2Co/NOMC, (c) FeCo/NOMC, (d) Fe0.5Co/NOMC.

Fig. 5. High-resolution XPS spectra of Co 2p peak and peak fitting result of (a) Fe2Co/NOMC, (b) FeCo/NOMC, (c) Fe0.5Co/NOMC, (d) Co/NOMC.

Table 1 Elemental composition (at. %) measured by XPS.

Sample	C	N	O	Fe	Co	Fe:Co
Fe/NOMC	81.14	1.75	15.25	1.86	0	—
Fe₂Co/NOMC	82.42	1.76	13.16	1.72	0.94	1.83
FeCo/NOMC	83.36	1.79	12.52	1.08	1.25	0.78
Fe_0.5Co/NOMC	82.41	1.82	13.39	0.82	1.56	0.53
Co/NOMC	81.01	1.50	15.76	0	1.73	—

Fig. 6. (a) ORR’s polarization curves (scanning rate: 10 mV s-1, rotating rate: 1600 rpm, O2-saturated 0.10 M KOH solution), (b) the corresponding current density at 0.90 V, and (c) electron transfer number (n) of all the catalysts; (d) OER’s polarization curves (scanning rate: 5 mV s-1, rotating rate: 1600 rpm, O2-saturated 1.0 M KOH solution), and (e) OER’s overpotential at 10 mA cm-2 of all the catalysts; (f) Full-potential-window polarization curve of Fe0.5Co/NOMC.

Fig. 7. (a) Discharging and charging polarization curves, and (b) power density diagram of Zn-air battery assembled with Fe0.5Co/NOMC and IrO2+Pt/C, respectively; (c) Specific capacity and (d) specific energy density diagrams at 100 mA cm?2, and (e) cycling performance at 5 mA cm?2 for 10 min discharging and 10 min charging of Zn-air battery assembled with Fe0.5Co/NOMC; (f) Schematic of the rechargeable Zn-air battery; (g) Photo of thirty-eight LEDs powered by two rechargeable Zn-air batteries Photo of 38 LEDs powered by two rechargeable Zn-air batteries.

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