In this work, the distribution function of relaxation times (DFRT) of a RuO₂ catalyst is determined by Impedance Spectroscopy Genetic Programming (ISGP). The resulting DFRT plots contain three peaks that vary with the overpotential. This discloses the presence of various electrochemical phenomena at different relaxation times in the catalyst. The effective resistance to charge transfer during the oxygen evolution reaction (OER) is small at low overpotential but becomes dominant at high overpotential. Moreover, we can track the change in each peak after a stability test: the resistance to both the production rate of intermediates and charge transfer show an increase while the solution resistance is almost constant. Hence, ISGP opens a new avenue for analyzing catalysts and providing detailed information about the resistance contributed by various phenomena.

在这项工作中，RuO ₂的弛豫时间（DFRT）的分布函数催化剂由阻抗谱遗传规划（ISGP）确定。生成的DFRT图包含随过电势而变化的三个峰。这公开了在催化剂的不同弛豫时间存在各种电化学现象。氧释放反应（OER）期间，电荷转移的有效阻力在低过电势下较小，但在高过电势下则占主导地位。此外，我们可以跟踪稳定性测试后每个峰的变化：对中间体产生速率和电荷转移的耐受性均显示出增加，而溶液电阻几乎恒定。因此，ISGP开辟了一条新的途径来分析催化剂并提供有关各种现象引起的阻力的详细信息。