Electrochemical stability of a commercial Rh/C catalyst has been studied in an acidic electrolyte by accelerated degradation protocols (ADP) which involved 5000 rapid voltammetric scans (1 V/s) in two potential regions: ADP1 was performed between 0.4 V_RHE and 1.4 V_RHE, while ADP2 was performed between 0.05 V_RHE and 1.4 V_RHE. Degradation of Rh/C was monitored by the changes in Rh electrochemical surface area (ECSA) and electrocatalytic activity for hydrogen evolution (HER) and oxygen reduction (ORR). Rh/C catalyst was particularly stable during ADP1 showing only a minor loss of ECSA, while its electrocatalytic activity for HER and ORR was practically unaffected, which was further corroborated with identical location SEM (IL-SEM) imaging. In the case of ADP2, severe degradation of Rh/C occurred followed by substantial decay in its electrocatalytic activity. Coupling of the electrochemical flow cell (EFC) with ICP-MS revealed much higher Rh dissolution in ADP2 than in ADP1. IL-SEM in combination with ex-situ TEM imaging showed that degradation of the Rh/C sample is not homogeneous during ADP2, as dissolution prevails on certain locations, while dissolution followed by re-deposition occurs on others. According to the results obtained in this work, Rh/C catalysts are exceptionally sensitive to the sudden potential jumps between particularly low and high values.

通过加速降解方案 (ADP) 在酸性电解质中研究了商业 Rh/C 催化剂的电化学稳定性，该方案涉及在两个潜在区域中进行 5000 次快速伏安扫描 (1 V/s)：ADP1 在 0.4 V _RHE和 1.4 V 之间进行_RHE，而 ADP2 在 0.05 V _RHE和 1.4 V _RHE之间执行. Rh/C 的降解通过 Rh 电化学表面积 (ECSA) 和析氢 (HER) 和氧还原 (ORR) 的电催化活性的变化来监测。Rh/C 催化剂在 ADP1 期间特别稳定，仅显示出轻微的 ECSA 损失，而其对 HER 和 ORR 的电催化活性几乎不受影响，这进一步得到了相同位置 SEM (IL-SEM) 成像的证实。在 ADP2 的情况下，Rh/C 发生严重降解，随后其电催化活性显着衰减。电化学流通池 (EFC) 与 ICP-MS 的耦合显示，ADP2 中的 Rh 溶解度远高于 ADP1。IL-SEM 结合非原位TEM 成像表明，在 ADP2 期间 Rh/C 样品的降解并不均匀，因为溶解在某些位置占优势，而在其他位置发生溶解后重新沉积。根据这项工作中获得的结果，Rh/C 催化剂对特别低和高值之间的突然电位跳跃异常敏感。