Several key electrocatalytic reactions are central to current research and technological applications: 1. Oxygen Evolution Reaction (OER): Critical for water splitting, OER involves the generation of oxygen gas from water. 2. Hydrogen Evolution Reaction (HER): Also essential for water splitting, HER produces hydrogen gas. 3. Oxygen Reduction Reaction (ORR): A key reaction in fuel cells, ORR involves the reduction of oxygen to water or hydroxide ions. 4. Carbon Dioxide Reduction Reaction (CO2RR): This reaction converts carbon dioxide into useful chemicals and fuels.