Researchers proposed that controlling the underwater wetting state of the electrode, especially that of a superhydrophobic electrode, was important for oxygen reduction reaction (ORR), a gas-consuming reaction. Through the rational design of the surface texture of the hydrophobic electrode, the underwater wetting state of the electrode was tuned in a controllable manner, and consequently the underwater liquid/gas/solid triphase interface where electron transfer commonly taking place was tailored. It was suggested that the superhydrophobic electrode with particularly underwater Wenzel-Cassie coexistent state (UWC-state) is the essence for maximizing and stabilizing the underwater liquid/gas/solid triphase interface, by which the gas-diffusion on the electrode could be drastically facilitated, along with the rate of the reaction with gas as the reactant.
- liquid/gas/solid triphase, ORR
- superhydrophobic electrodes
- wetting state