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Efficient electrohydrogenation of N₂ to NH₃ by oxidized carbon nanotubes under ambient conditions
- ZhaoJ. Zhao and B. Wang contributed equally to this work., Jinxiu, Wang, Bo, Zhou, Qiang, Wang, Huanbo, Li, Xianghong, Chen, Hongyu, Wei, Qin, Wu, Dan, Luo, Yonglan, You, Jinmao, Gong, Feng (Frank), Sun, Xuping
- Chemical communications 2019 v.55 no.34 pp. 4997-5000
- ammonia, carbon nanotubes, catalysts, density functional theory, electrochemistry, electrodes, hydrogen, nitrogen, nitrogen fixation, oxidation
- It is of great importance to search for efficient and stable metal-free catalysts toward electrochemical N₂-to-NH₃ conversion. In this communication, a chemically oxidized carbon nanotube material (O-CNT) is verified as an active electrocatalyst for the N₂ reduction reaction under ambient conditions. In 0.1 M LiClO₄, O-CNT achieves a large NH₃ yield of 32.33 μg h⁻¹ mgcₐₜ.⁻¹ and a high faradaic efficiency of 12.50% at −0.4 V vs. the reversible hydrogen electrode. It also demonstrates superior stability. Density functional theory calculations suggest that C–O groups play a key role in the electrochemical N₂ fixation.