Textured La2NiO4+δ membrane with enhanced oxygen permeability

带纹理的 La2NiO4 δ 膜,具有增强的透氧性

基本信息

项目摘要

Mixed ionic-electronic conducting (MIEC) ceramic-based membranes gained considerable attention, concerning their oxygen-transporting rates. Perovskite-based materials often tend to form carbonates in carbon dioxide atmospheres. The Ruddlesden-Popper type oxide La2NiO4+δ has the advantage of high chemical stability in carbon dioxide atmosphere at working conditions, thus membranes made of it would be favorable. However, compared to perovskite materials, the oxygen flux is poor. Therefore, the synthesis of La2NiO4+δ membranes with high oxygen permeation rates is a topic of interest in modern research. This project deals with the synthesis of textured La2NiO4+δ membranes with enhanced oxygen permeation. To enhance the oxygen permeation properties, a templated grain growth method by tape casting is proposed. Due to the anisotropy of the oxygen flux of the material, the particle arrangement of polycrystalline La2NiO4+δ membranes needs to be controlled. The templated grain growth method is described for several anisotropic materials in the literature and shows material properties, comparable to single crystals. For this method large anisotropic template particles are dispersed in a matrix of fine-grained, equiaxial particles. The equiaxial particles are synthesized via a sol-gel route and the anisotropic template particles are synthesized via a molten-salt flux method. After the production of the slurry, textured plates are obtained. These textured plates are stacked and laminated before sintering. Through heat treatment the growth of the anisotropic particles is favored over the small matrix particles. The particles are calcined until they impinge on one another and an anisotropic material is obtained. Finally, oxygen permeability, oxygen surface exchange coefficient and oxygen diffusion coefficient of the manufactured, textured La2NiO4+δ membranes are estimated.
混合离子-电子传导(MIEC)陶瓷基膜在氧传输速率方面受到了广泛关注。钙钛矿基材料通常倾向于在二氧化碳气氛中形成碳酸盐。Ruddlesden-Popper型氧化物La_2NiO_(4 +δ)在二氧化碳气氛中具有较高的化学稳定性,因此用它制备的膜是很有前途的。然而,与钙钛矿材料相比,氧通量较差。因此,合成具有高透氧速率的La 2NiO 4 +δ膜是现代研究的热点。本计画系以合成具有强化透氧功能之织构化La_2NiO_4 +δ薄膜为研究对象。为了提高氧渗透性能,提出了一种通过流延成型的模板晶粒生长方法。由于材料氧通量的各向异性,需要控制多晶La 2NiO 4 +δ膜的颗粒排列。在文献中描述了几种各向异性材料的模板晶粒生长方法,并显示出与单晶相当的材料特性。对于这种方法,大的各向异性模板颗粒分散在细粒度的等轴颗粒的基质中。通过溶胶-凝胶法合成了等轴粒子,通过熔盐助熔剂法合成了各向异性模板粒子。浆料生产后,获得纹理板。这些纹理板在烧结之前被堆叠和层压。通过热处理,各向异性颗粒的生长优于小基质颗粒。煅烧颗粒直到它们彼此撞击并获得各向异性材料。最后,氧渗透率,氧表面交换系数和氧扩散系数的制造,织构La 2NiO 4 +δ膜的估计。

项目成果

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Professor Dr. Armin Feldhoff其他文献

Professor Dr. Armin Feldhoff的其他文献

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{{ truncateString('Professor Dr. Armin Feldhoff', 18)}}的其他基金

Helium recovery from LNG waste stream using two-dimensional nanostructured MXene membranes
使用二维纳米结构 MXene 膜从 LNG 废物流中回收氦气
  • 批准号:
    409987259
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Development of a Ca3Co4O9-based thermoelectric generator via screen-printing
通过丝网印刷开发 Ca3Co4O9 基热电发电机
  • 批准号:
    325156807
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Construction and Characterization of MOF-Nanosheet Based Mixed Matrix Membranes with Two-Dimensional Nano-Confined Molecular Transport Pathways
具有二维纳米限制分子传输途径的基于 MOF-纳米片的混合基质膜的构建和表征
  • 批准号:
    322912360
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Leistungsfähigere Membranen für die Sauerstoffabtrennung aus Luft durch Korn- und Korngrenzendesign von Perowskitkeramiken
通过钙钛矿陶瓷的晶粒和晶界设计,更有效地从空气中分离氧气
  • 批准号:
    17116598
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Synthesis of phase pure high entropy perovskites with unique electrocatalytic and oxygen transport properties
具有独特电催化和氧传输性能的相纯高熵钙钛矿的合成
  • 批准号:
    538516601
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

相似国自然基金

离子取代对La2NiO4+δ混合导电特性的影响及其机理研究
  • 批准号:
    50572079
  • 批准年份:
    2005
  • 资助金额:
    30.0 万元
  • 项目类别:
    面上项目
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