Non-Equilibrium Thermodynamics defines a set of phenomenological coefficients to describe entropy production by means of thermodynamic fluxes. The determination of these phenomenological coefficients has proved to be a challenging task and hence it is not widely spread. In this study, a relationship between Electrochemical Impedance Spectroscopy and these coefficients is successfully presented. This opens the possibility of obtaining these important coefficients with this practical well known technique, allowing the experimental determination of the entropy production specially for a YSZ electrolyte. Reducing the entropy production will lead to an increased efficiency and thus the wider spread of SOFCs and SOECs.

非平衡热力学定义了一组现象学系数来描述通过热力学通量产生的熵。确定这些现象学系数是一项艰巨的任务，因此并未得到广泛推广。在这项研究中，成功​​地提出了电化学阻抗谱和这些系数之间的关系。这打开了利用该实用的众所周知的技术获得这些重要系数的可能性，从而允许实验确定YSZ电解质的熵产。减少熵产生将导致效率提高，从而导致SOFC和SOEC的广泛传播。