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

Abstract

Electroreduction of nitrite (NO₂ ^- ) to ammonia (NH₃ ) provides a sustainable approach to yield NH₃ , whilst eliminating NO₂ ^- 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 NO₂ ^- to NH₃ . In 0.1 M NaOH with NO₂ ^- , such Ni@HPCF electrode obtains a significant NH₃ 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.

Keywords: 3D framework; Ni nanoparticle; ammonia synthesis; electrochemical nitrite reduction; porous carbon.