雙通道型高溫固態氧化物離子導體複合材薄膜之開發研究

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Title:	雙通道型高溫固態氧化物離子導體複合材薄膜之開發研究 Development of Thin Film Composite of Duel-Channel High Temperature Solid Oxide Ionic Conductors
Authors:	陳彥友
Contributors:	化學工程與材料工程學系
Keywords:	固態氧化物離子導體複合材薄膜鈣鈦礦結構離子導電性界面反應
Date:	2020
Issue Date:	2020-01-16 15:18:49 (UTC+8)
Abstract:	高溫固態氧化物離子導體被廣泛應用在能源領域以及各種感測器上，這類型材料的晶體結構以螢石型與鈣態礦型為主，文獻中的報導以新材料的開發與新結構的設計為主要方向，以這二種方式來提升離子導體的電性與降低操作溫度。新材料的部分，摻雜異電價的過渡金屬元素到離子導體的結構中，形成完全固溶體來增加結構上的氧空缺，使電荷載體的離子更容易在離子導體中進行擴散，以達到提升導電性的效果;結構的控制部分，以控制晶粒的尺寸大小來控制晶界密度，或是直接控制晶界相的成分與形態為主。高溫固態離子導體的電荷載體，可以分為正離子(如質子H+)與負離子(如氧離子O2-)二種，這二種類型的離子在離子導體中的擴散行為，皆與結構內的缺陷有關。因此，本研究針對上述離子導體電性的重要控制因素，規劃三項研究主題：(一)鈣鈦礦與螢石型雙通道固態氧化物離子導體奈米複合材與薄膜製程技術開發；(二)雙相固態離子導體複合材微結構與晶界界面反應分析；(三)雙相固態離子導體複合材薄膜元件中質子和離子擴散行為與離子導電性之分析。主要的研究重點為利用雙相複合材的概念，同時提供質子與氧離子的擴散通道，以達到提升離子導體的性能為目的，並將嘗試控制晶界上高阻值或電子導電相的生成。 High-temperature solid-oxide ionic conductors are widely used in the enery generation fields and kinds of sensors and gas filters. The crystalline structures of these materials are mainly the types of pervoskite and fluorite. In literatures, new materials development and new microstructure designs are the two major trends to enhance the ionic conductivity and reduce the operating temperature. In the development of new materials, by adding trivalent transition metal ions into the structures of ionic conductors to form the fully solid solution and generate the oxygen vacancies are the major approaches to enhance the ionic conductivity. The oxygen vacancies can help the diffusion of protons or oxygen ions, which are the carriers to deliver charges to increase the ionic conductivity; In the designs of microstructures, controlling the grain dimension to control the grain boundary density or controlling the composition and distribution of grain boundary phases are the two major approaches. In general, the types of charge carriers for solid-state ionic conductors are both cations and anions, for example protons (H+) and oxygen ions (O2-), and the diffusion behaviors of these ions are related to the concentration of oxygen vacancy. In this study, we propose three topics according to the discussion above, including (1) the development of duel-phasic solid-oxide ionic conductive thin film composites based on pervoskite and fluorite structures,(2) the analysis of microstructures and interfacial reactions on the grain boundary of duel-phasic solid-oxide ionic conductive composites, and (3) the mechanism of ionic conductivity and diffusion behavior of the devices of protons and oxygen ions in duel-phasic solid-state ionic conductive thin film composites. The key issues are to develop the duel-channels in the composites that can help the diffusion of both protons and oxygen ions to increase the electrical performance, and to control the grin boundary phases to prevent the inhibition of the diffusion of charge carriers.
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