High-Efficiency Electroreduction of Nitrite to Ammonia on Ni Nanoparticles Strutted 3D Honeycomb-Like Porous Carbon Framework

Graphical Electrochemical nitrite reduction to ammonia : Ni nanoparticles strutted 3D honeycomb-like porous carbon framework acts as a highly efficient catalyst for ammonia synthesis via electrochemical NO 2 − reduction, delivering a large NH 3 yield of 12.04 mg h −1 mg cat. −1 and a high Faradaic efficiency of 95.1 %. Electroreduction of nitrite (NO 2 − ) to ammonia (NH 3 ) provides a sustainable approach to yield NH 3 , whilst eliminating NO 2 − contaminants. In this study, Ni nanoparticles strutted 3D honeycomb-like porous carbon framework (Ni@HPCF) is fabricated as a high-efficiency electrocatalyst for selective reduction of NO 2 − to NH 3 . In 0.1 M NaOH with NO 2 − , such Ni@HPCF electrode obtains a significant NH 3 yield of 12.04 mg h −1 mg cat. −1 and a Faradaic efficiency of 95.1 %. Furthermore, it exhibits good long-term electrolysis stability.