Hence, as a final follow-up, the Mn70Ti30Ox sample was subjected to an even more rigorous testing using in-situ ICP-MS. The coupling of a mass spectrometer to the SFC allows for studying the real-time Mn and Ti dissolution during electrochemical operations with high sensitivities. This approach will help understand catalyst stability from the perspective of active site leaching, a key degradation pathway for electrocatalysis. 53