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Preliminary study of an open-air water-contacting discharge for direct nitrogen fixation

Plasma Science and Technology 2021年第3期23卷 93-101页

作者： Zhan SHU Chuanqi WANG Insaf HOSSAIN Qiang CHEN Wanlian LI Jinqi WANG Pengfei LIU Qing XIONG State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqing 400044People's Republic of China Shenzhen Research Institute of Xiamen University Institute of Electromagnetics and AcousticsFujianProvincial Key Laboratory of Plasma and Magnetic ResonanceKey Laboratory of Electromagnetic Wave Science and Detection TechnologyXiamen UniversityXiamen 361005People's Republic of China

Efficient nitrogen fixation through a reactive plasma process attracts intense interest due to the environmental issues induced by the conventional Haber–Bosch method. In this work, we present a direct and simple fixation routine without any catalysts for nitrogen in open air using an atmospheric-pressure pin-to-solution plasma electrolytic system. Nitrate, nitrite, and ammonia as the nitrogen-derived chemicals in solution were analyzed as indicators under various discharge conditions to estimate the energy efficiency of this process. The results show that the nitrogen fixation process was much more efficient by the pin-positive discharge compared to the negative one. N chemicals preferred to be formed when the solution was of negative polarity. It was also found that, with the help of solution circulation, the energy efficiency was enhanced compared to that of static liquid. However, an inverse trend was observed with the increase of the discharge current. Further study by optical emission spectroscopy indicates the important roles of active N2* and water vapour and their derived species near the plasma–water interface in the fixation process.

关键词： nitrogen fixation air-water discharge energy efficiency active species plasma-water interface

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