Two-in-one strategy to construct bifunctional oxygen electrocatalysts for rechargeable Zn-air battery

doi:10.1016/S1872-2067(21)63979-7

Abstract

Abstract:

Integrating two different catalytic active sites into one composite is a useful 2-in-1 strategy for designing high-efficient bifunctional catalysts, which can easily tailor the activity of each reaction. Hence, we adopt the 2-in-1 strategy to design the metal oxyhydroxide supported on N-doped porous carbons (PA-CoFe@NPC) as the oxygen bifunctional catalyst, where NPC provides the activity for oxygen reduction reaction (ORR) while the metal oxyhydroxide is responsible for oxygen evolution reaction (OER). Results demonstrate that the PA-CoFe@NPC indeed exhibits both super ORR and OER activities. Impressively, using bifunctional PA-CoFe@NPC as the oxygen electrode, the resulting Zn-air battery exhibits outstanding charge and discharge performance with the peak power density of 156.3 mW cm^‒2, and also exhibits a long-term cycle stability with continuous cyclic charge and discharge of 170 hours that is obviously better than the 20% Pt/C+IrO₂based one. The 2-in-1 strategy in this work can be efficiently extended to design other bi- or multi-functional electrocatalysts.

Key words: Two-in-one strategy, Bifunctional catalyst, Oxygen reduction, Oxygen evolution, Zn-air battery

Huibing Liu, Rixin Xie, Ziqiang Niu, Qiaohuan Jia, Liu Yang, Shitao Wang, Dapeng Cao. Two-in-one strategy to construct bifunctional oxygen electrocatalysts for rechargeable Zn-air battery[J]. Chinese Journal of Catalysis, 2022, 43(11): 2906-2912.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63979-7

https://www.cjcatal.com/EN/Y2022/V43/I11/2906

Figures/Tables 5

Fig. 1. (a) Synthesis diagram of PA-CoFe@NPC. (b) SEM image of P-PA-CoFe@NPC. (c) TEM image of P-PA-CoFe@NPC. (d-h) EDS mappings for P-PA-CoFe@NPC.

Fig. 2. All ORR measurements were implemented in O2-saturated 0.1 mol L?1 KOH electrolyte. (a) ORR polarization curves. (b) Tafel plots of PA-CoFe@NPC, PA-Co@NPC, PA-Fe@NPC, NPC and 20% Pt/C. (c) The n (upper) and the H2O2 yield (lower) of PA-CoFe@NPC and 20% Pt/C at 0.2-0.8 V from RRDE. (d) I-t chronoamperometric response of PA-CoFe@NPC and 20% Pt/C.

Fig. 3. OER performance of PA-CoFe@NPC, PA-Co@NPC, PA-Fe@NPC, NPC and 20% Pt/C+IrO2 samples in 0.1 mol L-1 KOH. (a) OER LSV plots. (b) Tafel plots. (c) Nyquist plots. (d) OER and ORR LSV curves.

Fig. 4. (a) TEM image of PA-CoFe@NPC. (b) HRTEM image of PA-CoFe@NPC (scale bar, 5 nm). (c-i) EDS mappings of PA-CoFe@NPC after the OER. (j) Co 2p XPS spectra of PA-CoFe@NPC before and after the OER. (k) Fe 2p XPS spectra of PA-CoFe@NPC before and after the OER.

Fig. 5. (a) The sketch mapping of Zn-air battery. (b) Open circuit voltage of PA-CoFe@NPC based battery. (c) The discharging curves and power density of PA-CoFe@NPC and 20% Pt/C+IrO2 based Zn-air batteries. (d) Charging and discharging curves of PA-CoFe@NPC and 20% Pt/C+IrO2-based batteries. (e) The stability of PA-CoFe@NPC and 20% Pt/C+IrO2 based battery at 5 mA cm-2 of 170 h cyclic charge and discharge test.

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