Accelerating electrosynthesis of ammonia from nitrates using coupled NiO/Cu nanocomposites.

Herein, we report a nanocomposite electrocatalyst with coupled Cu and NiO, showing a high Faraday efficiency of 97% and excellent ammonia production rate (450 mg h -1 cm -2 ) for nitrate reduction. In situ UV-vis spectroscopic studies confirmed that the synergy between NiO and Cu could avoid NO 2 - enrichment and promote tandem nitrate reduction to ammonia synthesis.