Facile Route to Constructing Ternary Nanoalloy Bifunctional Oxygen Cathode for Metal-Air Batteries
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doi: 10.1007/s40242-020-0199-7
Article
Facile Route to Constructing Ternary Nanoalloy Bifunctional Oxyegn Cathode for Metal-Air Batteries WANG Huanfeng1,2, LI Junfeng2, LI Fei2, LI Jingjing1 and XU Jijing2,3* 1. College of Chemical and Food, Zhengzhou University of Technology, Zhengzhou 450044, P. R. China; 2. State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China; 3. International Center of Future Science, Jilin University, Changchun 130012, P. R. China Abstract Highly stable and efficient bifunctional air cathode catalyst is crucial to rechargeable metal -air batteries. Herein, a ternary nanoalloy layer composed of noble and base metal coated on a three-dimensional porous Ni sponge as the bifunctional cathode is synthesized through in-situ anchoring strategy, which can effectively keep the multimetal nanoparticles from agglomeration and improve the density of active sites and catalytic ac tivity. The prepared catalyst displays an excellent catalytic performance with lower overpotential and long -term stability. The Zn-air batteries with the as-prepared cathodes possess a large power density of 170 mW/cm 2, long cycling stability up to 230 cycles, and a high specific capacity of 771 mA·h/g. Furthermore, the corresponding Li-air batteries deliver a discharge capacity of 22429 mA·h/g. These superior properties of the metal-air batteries can be attributed to the combined influence of design and composition of electrode, which is of great significance to improve the electrochemical catalytic activity, providing great potential of wide application in expanded rechargeable energy systems. Keywords Metal-air battery; Bifunctional cathode; Self-standing; Nanosheet; Electrochemical performance
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Introduction
With the development of energy technology, metal-air batteries owning generally high theoretical energy density have received great attention in future clean energy. However, the poor catalytic performance toward both oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) in cathode remains the major limiting factor hindering the commercial application of metal-air batteries[1,2]. Some noble metals, such as Pt, are well recognized as the superior ORR catalysts, while Ru/Ir-based catalysts are favorable to catalyze the OER[3—5]. However, the high cost has constrained their prevalent application in rechargeable metal-air batteries. Therefore, the noble metal economy needs to be considered[6—8]. Firstly, alloying noble metal with other transition metals has been proved very efficient in decreasing the dosage of noble metal, as well as enhancing the electrocatalytic performance[9—11]. A further step is to adjust the assembly process, and the size, morphology and structure of the prepared materials[12,13]. Nanostructured materials owning particular physical and chemical properties including large specific surface area, favorable transport properties, and confinement effects, have been widely applied
to energy storage and con
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