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

1340269-黄提出的探索性研究旨在从基础科学的角度了解含有高度相互连接的离子通道的两相混合氧化物离子和碳酸盐离子传导膜为什么以及如何显示出优越的二氧化碳传输特性。智能价值建议研究的主要智力优点集中在独特的平行双离子路径模型上，该模型将离子传输区从三相边界(3PBS)扩展到两相边界(2PBS)，并辅之以以下实验：1)利用原位拉曼光谱识别新的中间表面物种；2)通过MC-Full渗透池验证双离子传输模型。具体地说，首次提出C2O52-聚碳酸酯离子作为中间表面物种，在MC/氧离子导体界面的2PBS处被O2-还原，证实了通过与简单的亲核阴离子CO32？(CO2)n相继结合，形成了含有强CO键和结构稳定的链状[CnO2n+1]部分的CO32？(CO2)n。用几个二氧化碳通过原位拉曼光谱验证所提出的通过MC淹没的表面阻挡渗透单元的双离子传输模型布罗德影响发现节能且经济实惠的二氧化碳分离膜对现有化石燃料发电厂二氧化碳捕获技术的开发和部署至关重要。这项研究有可能改变人们理解非均相体系中离子传输行为的传统观点，并最终导致合理设计适用于各种能源应用的高性能离子体系。一个例子是设计用于高效大规模二氧化碳洗涤的(CO2)n链状化合物，例如固体聚碳酸酯CnO2n+1R2(R=大尺寸基团)。另一个例子是CnO2n+1H2的设计，这是一类潜在的高能量密度材料，因为它们放热分解成NCO2+H2O产品，但由于存在大量的解离势垒，因此在局部是稳定的。研究生和本科生，包括少数群体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。正在进行的二氧化碳捕集和封存技术领域的科学进步的重要性和潜在影响将通过南卡罗来纳大学工程与计算学院的年度“爱迪生讲座系列”计划向公众传播。

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.