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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (10): 105404.doi: 10.1088/2058-6272/aace9e

• Low Temperature Plasma • Previous Articles     Next Articles

Exploration of a MgO cathode for improving the intensity of pulsed discharge plasma at atmosphere

He GUO (郭贺)1,3, Xiaomei YAO (姚晓妹)1,3, Jie LI (李杰)1,2,3, Nan JIANG (姜楠)1,2,3 and Yan WU (吴彦)1,2,3   

  

  1. 1 Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, Dalian University of Technology, Dalian 116024, People’s Republic of China
    2 School of Electrical Engineering, Dalian University of Technology, Dalian 116024, People’s Republic of China
    3 School of Environmental Science & Technology, Dalian University of Technology, Dalian 116024, People’s Republic of China
  • Received:2018-03-26 Published:2018-06-22
  • Supported by:

    The authors give thanks to National Natural Science Foun- dation Committee of China (No. 51477025) for the financial support of this work.

Abstract:

With regard to the lower density and energy of electrons in pulsed discharge plasma (PDP) at atmosphere, leading to the lower energy utilization of plasma, we propose a MgO cathode to enhance the plasma intensity according to field emission principle. The MgO cathode is prepared by an electro-depositing MgO film on a stainless steel plate. This way, the positive charges come to the cathode and accumulate on the surface of the MgO film, leading to the enhancement of the electric field intensity between the cathode and MgO film, and result in the strong emission of secondary electrons from the MgO cathode. As a result, the intensity of plasma can be enhanced. Herein, the effect of the MgO cathode on the intensity of PDP is investigated. It was shown that the discharge peak current was improved by 20% compared with that of without the MgO cathode. With increasing the MgO film thickness, discharge intensity, including the peak current, transforming charge and spectrum intensity first increased and then decreased. Higher enhancement of peak current, transforming charge and spectrum intensity were acquired with a higher peak voltage. Compared to a cathode without MgO film, the ozone production is higher with MgO cathode employed. The research proposes a novel approach for improving the intensity of discharge plasma, and also provides a reference for further application of PDP.

Key words: discharge intensity, pulsed discharge plasma, MgO cathode, secondary electron emission