Abstract
Ammonia (NH3) synthesis from electrochemical conversion of nitrate (NO3−) can efficiently reduce the emission of nitrogen oxide. However, the complex reaction pathways of nitrate reduction to NH3 are not fully revealed by previous reports. Here we point out that Ag/Cu2O hybrids prepared with the assistance of oxygen vacancies (OV) have very competitive activity (selectivity: 96.85%, Faradaic efficiency: 96.45%) for NH3 synthesis from NO3−. Detailed characterizations demonstrate that this high performance of Ag/Cu2O hybrids derives from the strong interface interactions owing to the formation of strong AgCu bonds. Both online differential electrochemical mass spectrometry (DEMS) and density functional theory (DFT) calculations demonstrate that the strong interface interactions between Ag nanoparticles (NPs) and Cu2O can efficiently boost the adsorption of NO3− and facilitate the formation of *N intermediates in NH3 synthesis.
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