Reactivity of nitrogen atoms from Zif-8 structure deposited over Ti3C2 MXene in the electrochemical nitrogen reduction reaction

Andre L. A. Marinho,Clement Comminges, Aurelien Habrioux,Stephane Celerier, Nicolas Bion,Claudia Morais

CHEMICAL COMMUNICATIONS(2023)

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摘要
The electrochemical nitrogen reduction reaction (NRR) to produce NH3 is the most efficient, eco-friendly and cost-effective alternative to the Haber-Bosch process. It is crucial to investigate and develop electrocatalysts selective for NH3 synthesis. In recent studies, the Ti3C2 MXene has emerged as a highly promising electrocatalyst for the NRR process. In this work, we explore the effect of Zif-8 addition over MXene sheets in order to control the rate of hydrogen evolution reaction (HER). Despite the better result obtained for Zif-8@Ti3C2 (3.0 & mu;g NH3 g(cat)(-1) h(-1) at -0.55 V/RHE), the ammonia produced when using Zif-8@Ti3C2 as cathode material is shown to be originated from nitrogen atoms contained in the Zif-8 structure instead of those of N-2. The results shed light to the need to fully understand the N-2 electroreduction process over N-containing electrocatalysts.
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