High-Performance Electrocatalytic Reduction of Nitrite to Ammonia under Ambient Conditions on a FeP@TiO<sub>2</sub> Nanoribbon Array
Ailin Zhang, Yimei Liang, Xun He, Xiaoya Fan, Congling Yang, Ling Ouyang, Dongdong Zheng, Shengjun Sun, Zhengwei Cai, Yonglan Luo, Qian Liu, Sulaiman Alfaifi, Cai Li, Huiqing Wang, Xuping Sun
Abstract
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.