High-Performance Electrocatalytic Reduction of Nitrite to Ammonia under Ambient Conditions on a FeP@TiO₂ Nanoribbon Array

Abstract

Electrochemical nitrite (NO₂^-) reduction is recognized as a promising strategy for synthesizing valuable ammonia (NH₃) and degrading NO₂^- pollutants in wastewater. The six-electron process for the NO₂^- reduction reaction is complex and necessitates a highly selective and stable electrocatalyst for efficient conversion of NO₂^- to NH₃. Herein, a FeP nanoparticle-decorated TiO₂ nanoribbon array on a titanium plate (FeP@TiO₂/TP) is proposed as an efficient catalyst for NH₃ production under ambient conditions. In 0.1 M NaOH with 0.1 M NO₂^-, such a FeP@TiO₂/TP affords a large NH₃ yield of 346.6 μmol h^-1 cm^-2 and a high Faradaic efficiency of 97.1%. Additionally, it demonstrates excellent stability and durability during long-term cycling tests and electrolysis experiments.