Impact on Electrodes During Plasma Decomposition of CO2

K. Wright, C. Sahay, T. Poole
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Abstract

A reactor being developed and instrumented for plasma decomposition of carbon dioxide contains a pin-to-plane micro-discharge, with a stainless steel pin and aluminum electrode. The degradation of the aluminum electrode over testing time is an unwanted effect of this particular system. A predictive model of degradation of the current electrode is being developed to relate the system parameters and treatment time with degradation of the electrode. Other aspects of the set-up are also being studied based on this phenomenon, including energy losses from the system, which can detract from the overall efficiency of the process of plasma decomposition of carbon dioxide. A test electrode of aluminum is arranged with a demarcated grid of test sections. Then, plasma discharges are applied at the centers of these grids within each area of approximately 2 mm x 2mm. Scans of these areas are taken using a three-dimensional optical profiler for non-contact measurement and characterization of micro- and nano-scale features of the aluminum surface. It should be noted that the instrumentation utilized provides up to 0.15 nm vertical precision. Hence, a predictive model can be developed with the purpose of determining how long the discharge gap length can remain within a reasonable range to sustain the plasma discharge across the electrodes. Toward the goal of engineering a plasma system which can be consistently deployed to decompose carbon dioxide, considerations on longevity of the electrodes and/or necessary maintenance can be a useful step in scaling these systems and preparing them for more widespread use. Results will include impact of the micro-discharge on the electrodes during typical treatment times of plasma decomposition of carbon dioxide.
等离子体分解CO2对电极的影响
正在开发的用于等离子体分解二氧化碳的反应器包含一个针到平面的微放电,用不锈钢针和铝电极。铝电极在测试时间内的退化是这种特殊系统的不希望的影响。目前正在开发一种预测电极降解的模型,将系统参数和处理时间与电极的降解联系起来。该装置的其他方面也正在基于这一现象进行研究,包括系统的能量损失,这可能会降低等离子体分解二氧化碳过程的整体效率。铝的测试电极设置有划界的测试段网格。然后,等离子体放电应用于这些网格的中心,每个区域约为2mm x 2mm。使用三维光学剖面仪对这些区域进行扫描,用于非接触式测量和表征铝表面的微观和纳米尺度特征。值得注意的是,所使用的仪器可提供高达0.15 nm的垂直精度。因此,可以建立一个预测模型,以确定放电间隙长度可以在合理范围内保持多长时间,以维持等离子体在电极上的放电。为了使等离子体系统能够持续地分解二氧化碳,考虑电极的寿命和/或必要的维护可能是扩展这些系统并为其更广泛使用做准备的有用步骤。结果将包括在等离子体分解二氧化碳的典型处理时间内微放电对电极的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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