Publication date: 21st July 2025
The anodic electrocatalytic reactions are the potential-determining steps in various electrolyzers. Understanding the intrinsic activity and stability of non-noble-metal-based materials is the root to enable future employment of gigawatt-scale system. Here we developed protocols to monitor real-time dissolution of metals, one of the detrimental pathways toward degradation of electrocatalytic activity, using scanning flow cell with inductively coupled plasma mass spectrometry (SFC-ICP-MS) over flame-spray pyrolyzed Co-based nano-oxides under respective oxygen evolution reaction (OER), chlorine evolution reaction (ClER), and glycerol oxidation reaction (GOR) in acidic or alkaline environment. The different geometries and oxidation states of redox-active Co sites among the studied crystal structures present impact on their intrinsic electrocatalytic activity. Furthermore, the difference in electrocatalytic stability of Co-based metal oxides under different applied electrochemical methods, e.g., cyclic voltametric anodic/cathodic scan and/or chronopotentiometry, is observed. In addition, the stability of different Co/M (M = second metal) sites and the shared/independent reaction intermediates for metal dissolution and anodic reaction will be discussed.
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