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

Electrochemical nitrite (NO 2 – ) reduction is recognized as a promising strategy for synthesizing valuable ammonia (NH 3 ) and degrading NO 2 – pollutants in wastewater. The six-electron process for the NO 2 – reduction reaction is complex and necessitates a highly selective and stable electrocatalyst for efficient conversion of NO 2 – to NH 3 . Herein, a FeP nanoparticle-decorated TiO 2 nanoribbon array on a titanium plate (FeP@TiO 2 /TP) is proposed as an efficient catalyst for NH 3 production under ambient conditions. In 0.1 M NaOH with 0.1 M NO 2 –, such a FeP@TiO 2 /TP affords a large NH 3 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.