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

1340269 -Huang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连的离子通道的双相混合氧化物离子和碳酸盐离子传导膜为何以及如何表现出优越的上级CO2传输特性。离子路径模型，该模型将离子转移区从三相边界（3 PB）扩展到双相边界（2 PB），并通过以下实验进行补充：1）用原位拉曼光谱法识别新的中间表面物种，2）验证双相边界。通过MC-淹没渗透池的离子传输模型。具体而言：o第一次提出C2 O 5 2-聚碳酸酯离子作为一个中间表面物种，减少了O2-在2 PB的MC/氧化物离子导体interfaceo确认CO 3 2的形成？（CO2）n含有强CO键和结构稳定的链状[CnO 2n +1]部分，通过连续结合简单的亲核阴离子CO 32？通过原位拉曼光谱法对所提出的双离子传输模型的验证更广泛的影响发现节能和成本有效的CO2分离膜对于现有化石燃料发电厂中CO2捕获技术的开发和部署至关重要。这项研究有可能改变传统的智慧，了解离子在非均质系统中的传输行为，并最终导致合理设计的高性能离子系统的各种能源应用。一个例子是设计（CO2）n链状化合物，如固体聚碳酸酯CnO 2n +1 R2（R=大尺寸基团），用于高效的大规模CO2洗涤。另一个例子是CnO 2n +1H 2的设计，CnO 2n +1H 2是一类高能量密度材料的潜在候选者，因为它们分解为nCO 2 + H2O产物，但由于存在大量解离势垒而局部稳定。包括少数民族和代表性不足的群体在内的研究生和本科生将通过明确的、有重点的研究项目在这项研究中发挥积极作用。将通过南卡罗来纳州工程和计算学院的年度“爱迪生系列讲座”方案向公众宣传二氧化碳捕获和储存技术领域正在取得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.