Maroto Juan Carlos, Muñoz Sagrario, Barragán Vicenta María
Department of Electronics, Automation, and Communications, Comillas Pontifical University, 28049 Madrid, Spain.
Department of Science and Aerospace, Universidad Europea de Madrid, 28670 Madrid, Spain.
Entropy (Basel). 2024 Dec 25;27(1):3. doi: 10.3390/e27010003.
The entropy production in the polarization phenomena occurring in the underlimiting regime, when an electric current circulates through a single cation-exchange membrane system, has been investigated in the 3-40 °C temperature range. From the analysis of the current-voltage curves and considering the electro-membrane system as a unidimensional heterogeneous system, the total entropy generation in the system has been estimated from the contribution of each part of the system. Classical polarization theory and the irreversible thermodynamics approach have been used to determine the total electric potential drop and the entropy generation, respectively, associated with the different transport mechanisms in each part of the system. The results show that part of the electric power input is dissipated as heat due to both electric migration and diffusion ion transports, while another part is converted into chemical energy stored in the saline concentration gradient. Considering the electro-membrane process as an energy conversion process, an efficiency has been defined as the ratio between stored power and electric power input. This efficiency increases as both applied electric current and temperature increase.
在3 - 40°C的温度范围内，研究了在电流通过单阳离子交换膜系统的欠极限状态下发生的极化现象中的熵产生。通过分析电流 - 电压曲线，并将电膜系统视为一维非均匀系统，从系统各部分的贡献估算了系统中的总熵产生。分别使用经典极化理论和不可逆热力学方法来确定与系统各部分中不同传输机制相关的总电势降和熵产生。结果表明，由于电迁移和扩散离子传输，部分输入电能以热的形式耗散，而另一部分则转化为储存在盐浓度梯度中的化学能。将电膜过程视为能量转换过程，定义了一个效率，即储存功率与输入电功率之比。该效率随着施加电流和温度的增加而提高。
