Abstract
Rechargeable Zn-air batteries (ZABs) are regarded as promising energy storage devices due to their high energy and power density, high safety and cost-effectiveness. Nevertheless, the practical application has been hampered by the sluggish kinetics of the oxygen reaction during the discharge and charge processes, respectively. Herein, La0.75Sr0.25 Fe0.5Mn0.5O3 (LSFMO) nanoparticles with a modified coprecipitation method possess high intrinsic activities. More importantly, the synergic covalent coupling between N/S dual-doped reduced graphene (NS-RGO) and LSFMO greatly improves the ORR and OER capabilities of novel perovskite/dual-doped graphene hybrid material (LSFMO@NS-RGO). The oxygen reduction reaction (ORR) activity (E1/2 of 0.806 V and n of 3.66) and oxygen evolution reaction (OER) activity (the Ej=10 of 1.672 V and overpotential of 442 mV) of LSFMO@NS-RGO are equivalent to the advanced Pt/C catalyst and RuO2 catalyst, respectively, thereby leading to excellent bifunctional property (ΔE = 0.86 V). Rechargeable ZABs deliver a fairly small charge-discharge voltage polarization (0.72 V). Besides, a rechargeable ZAB with flowing-electrolyte is constructed, which reveals considerably high reversibility and stability over 80 h, much improved over rechargeable ZAB in static electrolyte system. Such excellent results demonstrate that LSFMO@NS-RGO represents a new class of promising bifunctional catalysts for rechargeable ZABs. © 2023 Elsevier B.V.
Original language | English |
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Article number | 168817 |
Journal | Journal of Alloys and Compounds |
Volume | 939 |
Early online date | 11 Jan 2023 |
DOIs | |
Publication status | Published - Apr 2023 |
Externally published | Yes |
Funding
This work is supported from the School of Chemical Engineering, Northwest University . Shaanxi Coal Geology Group Co.,LTD and Special funds for scientific and technological innovation of state-owned capital operation budget in Shaanxi Province. Support from the National Natural Science Foundation of China ( 11872302 ), the Natural Science Basic Research Program of Shaanxi (Program No. 2023-JC-YB-046 ) and The Key Research and Development Program of Shaanxi (Program No. 2022-LL-QYLH-00X ).
Keywords
- Flowing-electrolyte
- Oxygen evolution reaction
- Oxygen reduction reaction
- Perovskite/dual-doped graphene
- Rechargeable Zn-air battery