Defective PrOx for Efficient Electrochemical NO2--to-NH3 in a Wide Potential Range by unknow

Author:unknow
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Tags: Electrocatalytic reduction of nitrite (NO2-) is a sustainable and carbon-neutral approach to producing green ammonia (NH3). We herein report the first work on building defects on PrOx for electrochemical NO2- reduction to NH3, and demonstrate a high NH3 yield of 2870 g h-1 cm-2 at the optimal potential of –0.7 V with a faradaic efficiency (FE) of 97.6% and excellent FEs of >94% at a wide given potential range (-0.5 to -0.8 V). The kinetic isotope effect (KIE) study suggested that the reaction involved promoted hydrogenation. Theoretical calculations clarified that there was an accelerated rate-determining step of NO2- reduction on PrOx. The results also indicated that PrOx could be durable for long-term electrosynthesis and cycling tests., green chemistry; electrocatalysis; ammonia synthesis; rare earth; defect engineering


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