过电位
电催化剂
析氧
双功能
催化作用
材料科学
金属有机骨架
化学工程
双功能催化剂
电流密度
化学
纳米技术
电化学
无机化学
电极
物理化学
有机化学
量子力学
吸附
工程类
物理
作者
Weijin Li,Song Xue,Sebastian Watzele,Shujin Hou,Johannes Fichtner,Anna Lisa Semrau,Liujiang Zhou,Alexander Welle,Aliaksandr S. Bandarenka,Roland A. Fischer
标识
DOI:10.1002/anie.201916507
摘要
Metal-organic frameworks (MOFs) and their derivatives are considered as promising catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which are important for many energy provision technologies, such as electrolyzers, fuel cells and some types of advanced batteries. In this work, a "strain modulation" approach has been applied through the use of surface-mounted NiFe-MOFs in order to design an advanced bifunctional ORR/OER electrocatalyst. The material exhibits an excellent OER activity in alkaline media, reaching an industrially relevant current density of 200 mA cm-2 at an overpotential of only ≈210 mV. It demonstrates operational long-term stability even at a high current density of 500 mA cm-2 and exhibits the so far narrowest "overpotential window" ΔEORR-OER of 0.69 V in 0.1 m KOH with a mass loading being two orders of magnitude lower than that of benchmark electrocatalysts.
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