Vincent Immanuel, Lee Eun-Chong, Kim Hyung-Man
Power System and Sustainable Energy Laboratory, Department of Nanoscience and Engineering, INJE University, 607 Eobang-Dong, Gimhae-si, Gyongsangnam-do, 621-749, Republic of Korea.
Sci Rep. 2021 Jan 11;11(1):293. doi: 10.1038/s41598-020-80683-6.
Anion exchange membrane (AEM) electrolysis is a promising solution for large-scale hydrogen production from renewable energy resources. However, the performance of AEM electrolysis is still lower than what can be achieved with conventional technologies. The performance of AEM electrolysis is limited by integral components of the membrane electrode assembly and the reaction kinetics, which can be measured by ohmic and charge transfer resistances. We here investigate and then quantify the contributions of the ohmic and charge transfer resistances, and the rate-determining steps, involved in AEM electrolysis by using electrochemical impedance spectroscopy analysis. The factors that have an effect on the performance, such as voltage, flow rate, temperature and concentration, were studied at 1.5 and 1.9 V. Increased voltage, flow rate, temperature and concentration of the electrolyte strongly enhanced the anodic activity. We observed that here the anodic reaction offered a greater contribution to the overpotential than the cathode did.
阴离子交换膜（AEM）电解是一种利用可再生能源大规模制氢的有前景的解决方案。然而，AEM电解的性能仍低于传统技术所能达到的水平。AEM电解的性能受到膜电极组件的整体部件和反应动力学的限制，这些可以通过欧姆电阻和电荷转移电阻来测量。我们在此通过电化学阻抗谱分析来研究并量化AEM电解中涉及的欧姆电阻和电荷转移电阻的贡献以及速率决定步骤。在1.5伏和1.9伏下研究了影响性能的因素，如电压、流速、温度和浓度。增加电压、流速、温度和电解液浓度会强烈增强阳极活性。我们观察到，在此阳极反应对过电位的贡献比阴极更大。
