Abstract
The conversion of harmful industrial-emitted nitric oxide from emission into valuable NH3 through NO electrochemical reduction reaction (NORR) is a green and sustainable route, which can enable the nitrogen cycle. However, exploring efficient catalyst and unveiling relevant intrinsic mechanism remains a big challenge for improving the efficiency. Herein, we delve into the facet-dependent activity of Cu2O nanocrystal, unveiling for the superior performance of oxygen-vacancy-anchored Cu2O (111) with an unprecedented NH3 yield of 273.5 μmol h−1 cm−2 and a Faradaic efficiency of 96.9% at −0.4 V vs RHE, which is significantly higher than that of Cu2O (100) and Cu2O (100)&(111). Cu2O (111) with abundant oxygen vacancies and hydroxyl groups facilitated the adsorption of NO and suppressed the hydrogen evolution reaction (HER), insights supported by theoretical calculations and in-situ attenuated total reflectance-surface-enhanced IR absorption spectroscopy (ATR-SEIRAS). Further, leveraging Cu2O (111) as the cathode, a proof-of-concept Zn-NO battery delivered superior performance with a power density of 4.62 mW cm−2 and an NH3 yield of 308.0 μg h−1 cm−2. This work not only elucidates the facet-dependent catalytic behaviors but also sets a new benchmark for NH3 synthesis and Zn-NO battery development, presenting a significant advancement in the sustainable and efficient conversion of nitric oxide.
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