EAGER: Exploring a New Bi-ionic Transport Mechanism in Dual-Phase Electrochemical CO2 Separation Membranes

提出的探索性研究旨在从基础科学的角度理解含有高度互联离子通道的双相混合氧化离子和碳酸盐离子导电膜为何以及如何表现出优越的CO2传输特性。本研究的主要智力优势集中在独特的平行双离子途径模型上，该模型将离子转移区从三相边界（3PBs）扩展到双相边界（2PBs），并辅以1)原位拉曼光谱鉴定新的中间表面物质和2)通过mc -淹没渗透池验证双离子传输模型。具体而言：o首次提出c2o52 -聚碳酸酯离子作为中间表面物质，在MC/氧化离子导体界面的2PBs处被O2-还原。（CO2）n含有强CO键和结构稳定的链状[CnO2n+1]基团，通过连续结合简单的亲核阴离子co32 ？更广泛的影响发现节能、经济的CO2分离膜对于现有化石燃料发电厂开发和部署CO2捕集技术至关重要。这项研究有可能改变人们对非均相系统中离子传输行为的理解，并最终导致合理设计高性能离子系统，用于各种能量应用。一个例子是（CO2）n链类化合物的设计，如固体聚碳酸酯CnO2n+1R2 （R=大尺寸组），用于高效的大规模CO2洗涤。另一个例子是设计CnO2n+1H2，这是一类高能密度材料的潜在候选者，因为它们会放热分解成nCO2 + H2O产物，但由于存在大量的解离屏障，它们在局部是稳定的。研究生和本科生，包括少数民族和代表性不足的群体，都将通过明确确定的、重点突出的研究项目，在这项研究中发挥积极作用。南卡罗来纳大学工程与计算学院的年度“爱迪生系列讲座”计划将向公众宣传二氧化碳捕获和储存技术领域正在进行的科学进展的重要性和潜在影响。

1340269 - HuangThe exploratory research proposed is aimed at understanding from a fundamental science perspective why and how dual-phase mixed oxide-ion and carbonate-ion conducting membranes containing highly interconnected ionic channels exhibit superior CO2 transport characteristics.Intellectual MeritsThe key intellectual merit of the proposed research is centered on the unique parallel bi-ionic pathways model that extends the ionic transfer zones from triple-phase boundaries (3PBs) to double-phase boundaries (2PBs) and is complemented by the experiments of 1) identification of a new intermediate surface species with in-situ Raman spectroscopy and 2) verification of the bi-ionic transport model through an MC-flooded permeation cell. Specifically:o For the first time C2O5 2- polycarbonate ions are proposed as an intermediate surface species that are reduced by O2- at 2PBs of MC/oxide-ion conductor interfaceo Confirmation of the formation of CO3 2?(CO2)n containing strong CO bonds and structurally stable chainlike [CnO2n+1] moieties by successively binding the simple nucleophilic anion CO3 2? with several CO2s through in-situ Raman spectroscopyo Verification of the proposed bi-ionic transport model through MC-flooded surface blocking permeation cellBroader ImpactsDiscovering energy-efficient and cost-effective CO2 separation membranes is of prime importance to the development and deployment of CO2 capture technologies in existing fossil fueled power plants. This research has the potential to transform conventional wisdom in understanding ionic transport behaviors in heterogeneous systems, and ultimately lead to rationally designed high-performance ionic systems for a variety of energy applications. One example is the design of (CO2)n chainlike compounds such as solid polycarbonates CnO2n+1R2 (R=large-size group) for highly efficient large-scale CO2 scrubbing. Another example is the design of CnO2n+1H2, a class of potential candidates for high-energy density materials as they decompose exothermically into nCO2 + H2O products, but are locally stable because of the existence of substantial dissociation barriers. Both graduate and undergraduate students including minority and underrepresented groups will play an active role in this research through clearly identified, focused research projects. The importance and potential impact of ongoing scientific advances in the area of CO2 capture and storage technologies will be disseminated to the general public via the annual "Edison Lecture Series" program of the College of Engineering and Computing at the University of South Carolina.