Remote access to electrical conductivity in ion conducting solids by means of charge carrier attachment from a fs-laser plasma

通过飞秒激光等离子体的载流子附着远程获取离子传导固体的电导率

• 批准号: 453987658
• 负责人: Professor Dr. Karl-Michael Weitzel
• 金额: --
• 依托单位: Arbeitsgruppe Weitzel
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/453987658?language=en
• 关键词: Remote; access; electrical; conductivity; ion

The electrical conductivity of ion conducting solid materials will be studied by means of the charge attachment induced transport (CAIT) technique, based on charge carriers from a fs-laser generated plasma. The underlying working principles has been proven in preliminary work. The approach shall be established, further advanced and applied to state-of-the-art scientific questions. The fs-laser ionization allows formation of a diversity of chemical charge carriers, e.g. oxygen anions and cations, protons, electrons, rare gas cations etc. at adjustable pressure and temperature under conditions which constitute a plasma. Attachment of polarity selected charge carriers from the plasma to a solid sample leads to the generation of well-defined gradients of the electrochemical potential, which in turn induces charge carrier transport in the sample. Transport coefficients can be either derived from current-voltage measurements or from the analysis of concentration depth profiles. The unique selling point of the approach is that a large variety of charge carriers can be attached to a sample under soft conditions and only triggers the actual electro-diffusive transport. In contrast to most established techniques, the Plasma-CAIT operates with only one contact between the sample and a metal electrode, at which the current will be measured. The plasma constitutes a virtual electrode with well-defined electro-chemical potential. Blocking zones can be rigorously avoided by this approach. The approach constitutes a remote access to electrical conductivity under conditions of DC-transport as relevant for all battery and fuel cell applications. One goal of the project is the development of a measuring routine for absolute conductivities circumventing the need for separate calibration measurements. In total measurement are planned to cover a range from mbar to several bar, with an emphasis on ambient conditions. Temperatures and eventually relative humidity will also be controlled. The Plasma-CAIT technique will be further developed for the example of Lithium-Aluminum-Germanium-Phosphate (LAGP) an important ion conductor and subsequently applied to a typical high temperature fuel cell material, i.e. yttrium stabilized zirconia (YSZ). The additional scientific knowledge gained by these studies pertains to the unambiguous identification of native charge carriers and the determination of element-specific transport coefficients, including partial transport coefficients for oxygen ions, lithium ions and protons in ion conducting solids.

利用光纤激光等离子体的电荷载流子，利用电荷附着诱导输运（CAIT）技术研究离子导电固体材料的电导率。基本的工作原理已在初步工作中得到证实。这种方法应当建立起来，进一步发展，并应用于最先进的科学问题。在构成等离子体的条件下，fs激光电离可以在可调的压力和温度下形成多种化学电荷载体，例如氧阴离子和阳离子、质子、电子、稀有气体阳离子等。将极性选择的载流子从等离子体附着到固体样品上，会产生明确定义的电化学电位梯度，从而诱导样品中的载流子输运。输运系数既可以由电流-电压测量得到，也可以由浓度深度分布分析得到。该方法的独特卖点在于，在软条件下，大量的载流子可以附着在样品上，并且只触发实际的电扩散输运。与大多数成熟的技术相比，等离子体- cait在样品和金属电极之间只有一个接触，在这个接触处将测量电流。等离子体构成一个具有明确的电化学势的虚电极。通过这种方法可以严格避免阻塞区域。该方法构成了对直流传输条件下电导率的远程访问，与所有电池和燃料电池应用相关。该项目的目标之一是开发一种测量绝对电导率的常规方法，从而避免了单独校准测量的需要。总的测量范围从毫巴到几巴，重点是环境条件。温度和最终的相对湿度也将得到控制。等离子体- cait技术将进一步发展为锂-铝-磷酸锗（LAGP）这一重要的离子导体，并随后应用于典型的高温燃料电池材料，即钇稳定氧化锆（YSZ）。通过这些研究获得的额外科学知识涉及原生电荷载流子的明确识别和元素特定输运系数的确定，包括氧离子、锂离子和离子导电固体中质子的部分输运系数。