Preparation of activated water using a hollow cathode discharge device with water as the electrode
ID：75
Submission ID：80 View Protection：ATTENDEE
Updated Time：2025-10-11 22:46:35 Hits：52
Poster Presentation
Start Time：2025-11-09 09:07 （Asia/Shanghai）
Duration：1min
Session：[P] Poster presentation » [P1] 1.Renewable energy system
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Abstract
Plasma activated water (PAW) faces limitations in large-scale applications due to its high energy cost, partly caused by insufficient interaction between plasma and liquid. This study develops an atmospheric-pressure hollow cathode discharge system using a water electrode, which effectively minimizes electrode erosion while substantially increasing the plasma-water contact area, leading to improving energy transfer efficiency and activation performance. Through systematic investigation of discharge parameters influencing solution properties (pH, H₂O₂, NO₂⁻, NO₃⁻, ONOO⁻), the results reveals monotonic variations with reaction time and optimal values at specific nitrogen ratios. Energy cost analysis demonstrates that under 60% nitrogen discharge for 5 minutes, the energy cost can be reduced to 27.73 MJ/mol—significantly lower than the minimum value reported in existing literature (40.60 MJ/mol). This work confirms the potential of hollow cathode discharge for energy-efficient PAW production and offers crucial guidance for energy cost optimization.
Keywords
hollow cathode discharge, plasma activated water, electrodeless discharge, energy cost
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