Water electrolysis is the least polluting method for hydrogen production in France. It splits water molecules using an electrolyzer. The device contains electrodes immersed in an electrolyte solution. When voltage is applied, water molecules split into oxygen on one side and hydrogen on the other.

Today, a membrane is usually required between the electrodes to separate hydrogen and oxygen. This technology uses a specific electrode geometry that separates gas bubbles as they form, removing the need for a membrane. The electrodes can therefore be placed closer together, increasing efficiency.

The electrode geometry is optimized to collect the largest amount of pure gas and prevent mixing. In particular, they include channels designed to guide gas bubbles. The purity-efficiency balance is improved, as the electrodes can be close without mixing risk.