MIE - Chemistry, Biology and Innovation (CBI) UMR8231, ESPCI Paris, CNRS, PSL Research University, 10 Rue Vauquelin, Paris, France.
Sci Rep. 2023 Jan 31;13(1):1722. doi: 10.1038/s41598-023-28592-2.
Electrochemical systems using a gas evolving electrode, such as metal-air batteries or electrolyzers, are confronted with recurrent problems related to gas production. Indeed, the production of gas at the surface of the electrodes causes a masking of the active surface which induces overvoltages and unstable electrical signals in time. We propose here numerical computations that take into account the spatial heterogeneity of the electrode and allow to account for the size distribution of the produced bubbles. We compare these computations to experiments on a Platinum-Carbon plate cell in the presence or absence of electrolyte flow. They reproduce the observed behavior and allow us to predict the stability of the signals. They are also a guide for the synthesis of efficient electrodes.
电化学系统使用气体析出电极，如金属-空气电池或电解槽，经常会遇到与气体生成相关的问题。实际上，电极表面产生气体导致活性表面被掩盖，从而在时间上产生过电压和不稳定的电信号。我们在这里提出了数值计算，这些计算考虑了电极的空间异质性，并允许考虑产生的气泡的尺寸分布。我们将这些计算与在有无电解质流动的情况下对铂-碳板电池的实验进行了比较。它们再现了观察到的行为，并使我们能够预测信号的稳定性。它们也是合成高效电极的指南。
