2-Dimensional Ion Conducting Bismuth Vanadates for Electrochemical Devices

该合作项目的科学目标是开发缺陷化学模型并确定受主掺杂钒酸铋陶瓷(BIMEVOX)的基本热/传导/输运(张量)性质，BIMEVOX是一类非标准的二维快离子导体。这涉及一个全面的合成、表征和测试计划，主要目标是：1.通过热锻造获得尽可能高的(接近理论密度)的BIMEVOX陶瓷。通过热锻(大块样品)和流延(厚膜)在BIMEVOX陶瓷中实现高晶体取向。3.表征(各向异性)导热系数和热膨胀系数。通过阻抗谱、极化和热电测量来测量BIMEVOX的(各向异性)传输特性，作为温度和pO2 5的函数。创建缺陷化学模型(Kroger Vink)，并通过上述测量进行验证。一个广泛的影响目标是在电化学设备中使用块状和厚膜BIMEVOX，以便在被认为对离子导体来说异常低的温度区域(350°C至500°C)运行。BIMEVOX将被整合到新设备中，如直接热电和混合电势气体传感器、脱NOx电池和单室燃料电池。

The scientific goal of this collaborative project is to develop a defect chemistry model and determine fundamental thermal/conduction/transport (tensor) properties for acceptor doped bismuth vanadate ceramic (BIMEVOX), a family of non-standard, bi-dimensional fast ion conductors. This involves a comprehensive synthesis, characterization, and testing plan, with key objectives: 1. Achieve the highest possible (near theoretical density) BIMEVOX ceramics via hot forging2. Achieve high crystallographic orientation in BIMEVOX ceramics via hot forging (bulk samples) and tape casting (thick films). 3. Characterize the (anisotropic) thermal conductivity and thermal expansion.4. Measure the (anisotropic) transport properties of BIMEVOX by impedance spectroscopy, polarization, and thermoelectric measurements as a function of temperature and pO2 5. Create defect chemical models (Kroger Vink), with verification from above measurements. A broad impact goal is the use of bulk and thick film BIMEVOX in electrochemical devices for operation in a temperature regime considered unusually low for ionic conductors (350°C to 500°C). BIMEVOX will be incorporated into novel devices such as direct thermoelectric and mixed potential gas sensors, de-NOx cells and single chamber fuel cells.