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

作　　者：Zhan SHU Chuanqi WANG Insaf HOSSAIN Qiang CHEN Wanlian LI Jinqi WANG Pengfei LIU Qing XIONG 舒展;汪传奇;Insaf HOSSAIN;陈强;李婉莲;王晋琪;刘鹏飞;熊青(State Key Laboratory of Power Transmission Equipment and System Security and New Technology,Chongqing University,Chongqing 400044,People's Republic of China;Shenzhen Research Institute of Xiamen University,Institute of Electromagnetics and Acoustics,Fujian,Provincial Key Laboratory of Plasma and Magnetic Resonance,Key Laboratory of Electromagnetic Wave Science and Detection Technology,Xiamen University,Xiamen 361005,People's Republic of China)

机构地区：[1]State Key Laboratory of Power Transmission Equipment and System Security and New Technology,Chongqing University,Chongqing 400044,People's Republic of China [2]Shenzhen Research Institute of Xiamen University,Institute of Electromagnetics and Acoustics,Fujian,Provincial Key Laboratory of Plasma and Magnetic Resonance,Key Laboratory of Electromagnetic Wave Science and Detection Technology,Xiamen University,Xiamen 361005,People's Republic of China

出　　处：《Plasma Science and Technology》2021年第3期93-101,共9页等离子体科学和技术（英文版）

基　　金：partly supported by National Natural Science Foundation of China (No. 11975061);the Technology Innovation and Application Development Project of Chongqing (No. cstc2019jscx-msxmX0041);the Construction Committee Project of Chongqing (No. 2018-1-3-6);the Fundamental Research Funds for the Central Universities (No. 2019CDQYDQ034)。

摘　　要：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 

分 类 号：TQ441[化学工程—化学肥料工业]