Mechanical, thermal, and electrochemical properties of Pr doped ceria from wafer curvature measurements
Mechanical, thermal, and electrochemical properties of Pr doped ceria from wafer curvature measurements
复制标题
通过晶圆曲率测量得出的 Pr 掺杂二氧化铈的机械、热和电化学特性
DOI：
10.1039/c8cp04802a
复制
发表时间：
2018
影响因子：
3.3
通讯作者：
Nicholas, Jason D.
中科院分区：
文献类型：
--
作者：
Ma, Yuxi;Nicholas, Jason D.
这项工作表明，第一次，各种不同的和技术相关的热，机械和电化学氧交换材料的性能都可以从原位，集电器的晶片曲率测量。具体地，温度或氧分压引起的200 μm厚单晶氧化钇稳定的氧化锆或氧化镁衬底上的230 nm厚（100）取向的Pr0.1Ce0.9O1.95-x（10 PCO）膜的曲率变化用于测量双轴模量、杨氏模量、热膨胀系数、热化学膨胀系数、氧非化学计量比、模型混合离子电子传导材料10 PCO的化学氧表面交换系数、氧表面交换电阻、热应力、化学应力、热应变和化学应变。在此测量的（100）取向薄膜10 PCO热膨胀系数、热化学膨胀系数、氧非化学计量和杨氏模量（其在空气中在280-700 °C的整个温度范围内在200 MPa下基本恒定）与来自其它块体和薄膜10 PCO研究的那些类似。此外，测得的PCO 10氧表面系数与其他原位，无集流体技术报告的那些一致。两者合计，这项工作突出了使用样品的机械响应，而不是更传统的电响应，以探测用于固体氧化物燃料电池，固体氧化物电解电池，气体传感，电池，排放控制，水分解，水净化和其他电化学活性设备的离子交换材料的电化学性能的优势。
This work demonstrates, for the first time, that a variety of disparate and technologically-relevent thermal, mechanical, and electrochemical oxygen-exchange material properties can all be obtained from in situ, current-collector-free wafer curvature measurements. Specifically, temperature or oxygen partial pressure induced changes in the curvature of 230 nm thick (100)-oriented Pr0.1Ce0.9O1.95−x (10PCO) films atop 200 μm thick single crystal yttria stabilized zirconia or magnesium oxide substrates were used to measure the biaxial modulus, Young's modulus, thermal expansion coefficient, thermo-chemical expansion coefficient, oxygen nonstoichiometry, chemical oxygen surface exchange coefficient, oxygen surface exchange resistance, thermal stress, chemical stress, thermal strain, and chemical strain of the model mixed ionic electronic conducting material 10PCO. The (100)-oriented thin film 10PCO thermal expansion coefficient, thermo-chemical expansion coefficient, oxygen nonstoichiometry, and Young's modulus (which is essentially constant, at ∼200 MPa, over the entire 280–700 °C temperature range in air) measured here were similar to those from other bulk and thin film 10PCO studies. In addition, the measured PCO10 oxygen surface coefficients were in agreement with those reported by other in situ, current-collector-free techniques. Taken together, this work highlights the advantages of using a sample's mechanical response, instead of the more traditional electrical response, to probe the electrochemical properties of the ion-exchange materials used in solid oxide fuel cell, solid oxide electrolysis cell, gas-sensing, battery, emission control, water splitting, water purification, and other electrochemically-active devices.