Boosting electrochemical nitrate-to-ammonia conversion by self-supported MnCo2O4 nanowire array
2023
Li, Jun | Zhao, Donglin | Zhang, Longcheng | Ren, Yuchun | Yue, Luchao | Li, Zerong | Sun, Shengjun | Luo, Yongsong | Chen, Quanying | Li, Tingshuai | Dong, Kai | Liu, Qian | Kong, Qingquan | Sun, Xuping
Direct electrocatalytic reduction of nitrate (NO₃–) is an efficient route to simultaneously synthesize ammonia (NH₃) and remove NO₃– pollutants under ambient conditions, however, it is hindered by the lack of efficient and stable catalysts. Herein, a self-supported spinel-type MnCo₂O₄ nanowire array is demonstrated for exclusively catalyzing the conversion of NO₃– to NH₃, achieving a high Faradic efficiency of 97.1% and a large NH₃ yield of 0.67 mmol h⁻¹ cm⁻². Furthermore, density functional analysis reveals that MnCo₂O₄ (220) surface has high activity for NO₃– reduction with a low energy barrier of 0.46 eV for *NO to *NOH.
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