Bimetallic metal–organic framework-derived carbon nanocubes as efficient electrocatalysts for oxygen evolution reaction
Journal of Solid State Chemistry(2020)
摘要
The design and synthesis of efficient electrocatalysts are important for electrochemical conversion technologies. The oxygen evolution reaction (OER) is a key process in such conversions, having applications in water splitting and metal–air batteries. Here, bimetallic carbon nanocubes electrocatalysts are derived from Hofmann-type metal–organic frameworks by carbonization and oxidization (FeNi@OCNC). FeNi@OCNC achieved a current density of 10 mA cm−2 at a low overpotential of 300.4 mV with a very small Tafel slope of 55.4 mV dec−1 in 1 M KOH, and its activity shows 12 h stability. We propose that the coupling effect between Fe, Ni metals is crucial for tuning the electrocatalytic activity, which makes FeNi@OCNC have more oxygen vacancies and higher carbon graphitization degree, thus showing excellent activity. The result may illustrate that bimetallic metal–organic framework-derived carbon nanocubes can be prospective materials for oxygen evolution reaction.
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关键词
Metal-organic frameworks,Bimetallic,Nanocube,Oxygen evolution reaction,Electrocatalysis
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