双功能
电催化剂
催化作用
氧化物
过渡金属
金属
材料科学
化学工程
化学
无机化学
电极
纳米技术
电化学
冶金
物理化学
有机化学
工程类
作者
Tingting Yu,Haitao Xu,Zeyu Jin,Yanyi Zhang,Hua‐Jun Qiu
标识
DOI:10.1016/j.apsusc.2022.155624
摘要
Noble metal-free electrocatalysts for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are crucial to rechargeable metal-air batteries. Nanoporous high-entropy spinels have recently been studied as bifunctional ORR/OER electrocatalysts due to the adjustable surface electronic structure and catalytic activity. In this work, we adjust catalytic activities of HEO by varying the composition and proportion of the metal elements and find an optimal seven-component AlNiCoFeCrMoV prepared by a scalable two-step dealloying strategy. The seven-component HEO is highly active for OER while it exhibits a relatively poor ORR activity, much worse than the commercial Pt/C. Thus, the highly ORR active Co-N-C is rationally integrated with the seven-component HEO to construct a highly bifunctional HEO/Co-N-C nanocomposite electrocatalyst. Importantly, when used in a Zn-air battery, small charge/discharge voltage differences and ultralong lifespan (at 2, 5, 10 mA cm−2) can be achieved. This work highlights the rapid screening and rational design of highly bifunctional catalysts by function integration in multicomponent high-entropy system.
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