Ambient Ammonia Synthesis via Nitrate Electroreduction in Neutral Media on Fe<sub>3</sub>O<sub>4</sub> Nanoparticles-decorated TiO<sub>2</sub> Nanoribbon Array
Xun He, Jun Li, Ruizhi Li, Donglin Zhao, Longcheng Zhang, Xianchang Ji, Xiaoya Fan, Jie Chen, Yan Wang, Yongsong Luo, Dongdong Zheng, Lisi Xie, Shengjun Sun, Zhengwei Cai, Qian Liu, Ke Ma, Xuping Sun
Abstract
Electrochemical nitrate (NO3–) reduction is a potential approach to produce high-value ammonia (NH3) while removing NO3– pollution, but it requires electrocatalysts with high efficiency and selectivity. Herein, we report the development of Fe3O4 nanoparticles decorated TiO2 nanoribbon array on titanium plate (Fe3O4@TiO2/TP) as an efficient electrocatalyst for NO3–-to-NH3 conversion. When operated in 0.1 M phosphate-buffered saline and 0.1 M NO3–, such Fe3O4@TiO2/TP achieves a prominent NH3 yield of 12394.3 μg h–1 cm–2 and a high Faradaic efficiency of 88.4%. In addition, it exhibits excellent stability during long-time electrolysis.