Controlling the electron dynamics in radio-frequency driven micro plasma jets for efficient CO2 conversion

再利用二氧化碳并将其转化为有价值的化学品的想法多年来一直是科学和公众利益的焦点。然而，已经表明热CO2转化不是非常有效。然而，低温等离子体的“温和”操作条件可以在很宽的范围内控制，可以是一个有前途的替代方案，使能源效率的二氧化碳转化使用高能电子，而不是纯粹的热量。本课题提出了高频驱动常压微等离子体射流技术，并基于数值模拟对其应用于CO2转化的潜力和局限性进行了初步研究。在这些等离子体中，可以调节电子能量分布函数（EEDF）以控制进入不同模式的能量的分布。这应该能够创造出节能的，因此也是重要的CO2解离通道。这特别适用于能量分量，其进入对CO2的有效解离至关重要的振动激发。为了通过定制的激励电压波形来控制电子动力学，必须从根本上理解EEDF的起源。德国小组将集中研究等离子体动力学和EEDF控制之间的耦合以及不同的解离机制。俄罗斯小组将致力于确定长时间尺度上等离子体射流流出物中的振动分布和中性化学。

The idea of re-using CO2 and converting it into valuable chemicals has been the focus of scientific and public interest for several years. However, it has been shown that thermal CO2 conversion is not very efficient. However, low-temperature plasmas with their "mild" operating conditions that can be controlled in a wide range can be a promising alternative to enabling energy-efficient CO2 conversion using energetic electrons instead of pure heat. In this project, high-frequency driven atmospheric pressure microplasmajets are proposed and the potentials and limits of their application for CO2 conversion are fundamentally investigated based on numerical simulation. In these plasmas it is possible to adjust the electron energy distribution function (EEDF) to control the distribution of energy going into different modes. This should make it possible to create energy-efficient and thus important channels for CO2 dissociation. This applies in particular to the energy component, which goes into the vibrational excitation crucial for efficient dissociation of CO2. In order to control electron dynamics by means of tailored excitation voltage waveform, the origin of the EEDF must be fundamentally understood. The German group will concentrate on the investigation of the coupling between plasma kinetics and EEDF control as well as the different dissociation mechanisms. The Russian group will work on the determination of the vibrational distribution and the neutral chemistry in the effluent of the plasma jet on the long time scale.