双功能
过电位
石墨烯
析氧
材料科学
电解质
催化作用
化学工程
双功能催化剂
纳米颗粒
兴奋剂
纳米技术
无机化学
化学
电极
电化学
光电子学
物理化学
有机化学
工程类
作者
Ziyi Shui,Huiying Tian,Muhammad Ali Raza,Liangliang Zhu,Xi Chen,Xi Chen
标识
DOI:10.1016/j.jallcom.2023.168817
摘要
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 ([email protected]). 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 L[email protected] 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 [email protected] represents a new class of promising bifunctional catalysts for rechargeable ZABs.
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