An electrochemical tool for characterising properties of non-stoichiometric oxides is described that is based on Electromotive Force (E.M.F.) measurements and coulometric titration. The tool may be used to subject samples to either solid-state or gas phase redox perturbations. A theoretical analysis of the setup shows that the open-circuit voltage (OCV) is characteristic of the oxygen activity in the solid at the interface between the sample and the Yttria Stabilised Zirconia (YSZ) sample-holder in the case of an inhomogeneous, essentially electronic conducting material. The device's purpose is illustrated with a study of cerium oxide at 900 °C. By running simple solid state reduction experiments, it is possible to simultaneously derive thermodynamic and chemical diffusion data consistent with existing literature. The approach we present appears as an interesting alternative to other techniques such as the relaxation method or impedance spectroscopy.

描述了一种用于表征非化学计量氧化物特性的电化学工具，它基于电动势 (EMF) 测量和库仑滴定。该工具可用于使样品经受固态或气相氧化还原扰动。该装置的理论分析表明，开路电压 (OCV) 是样品和氧化钇稳定氧化锆 (YSZ) 样品架之间界面处固体中氧活性的特征，在不均匀的情况下，本质上电子导电材料。该装置的用途通过对 900 度氧化铈的研究来说明 ℃。通过运行简单的固态还原实验，可以同时获得与现有文献一致的热力学和化学扩散数据。我们提出的方法似乎是其他技术（如弛豫方法或阻抗谱）的有趣替代方案。