Online Electrochemistry–Mass Spectrometry Evaluation of the Acidic Oxygen Evolution Reaction at Supported Catalysts
Chip-based EC-MS decouples true oxygen evolution from competing anodic side reactions in a graphene-supported Ru catalyst, enabling accurate measurement of OER onset potential and Faradaic efficiency. Activation, steady-state, and degradation processes are resolved individually — addressing a persistent measurement challenge in OER electrocatalysis.