Solid Oxide Electrolyzed Water

Solid Oxide Electrolyzed Water – Fuel Cell Coating – Cheersonic

Green hydrogen is to generate electricity through renewable energy, and then obtain hydrogen through electrolysis of water. Hydrogen production by electrolysis of water is to decompose water molecules into hydrogen and oxygen through an electrochemical process under the action of direct current, which are separated out at the cathode and anode respectively. At present, there are three main technical routes for hydrogen production by electrolysis of water, namely alkaline electrolysis (AWE), proton exchange membrane (PEM) electrolysis and solid oxide electrolysis (SOEC).

At present, the alkaline water electrolysis technology is quite mature and fully industrialized, and the proton exchange membrane electrolysis water technology has also achieved preliminary industrialization. The main problem it faces is the cost problem. The solid oxide water electrolysis technology is still in the laboratory research and development stage.

Let’s take a look at the technical principle of solid oxide electrolysis of water.

The solid oxide electrolytic cell has a dense electrolyte layer in the middle and porous electrodes at both ends. The electrolyte separates hydrogen and oxygen and conducts oxygen ions or protons. Therefore, electrolytes with high ionic conductivity and negligible electronic conductivity are required, and porous electrodes are favorable for gas diffusion and transport.

Basic process of SOEC electrolyzed water
1. At a higher temperature (600-1000℃), apply a certain DC voltage to the electrodes on both sides of the SOEC;
2. H2O is decomposed at the cathode to produce O2-, which passes through the dense solid oxide electrolyte layer to the anode, where it loses electrons to obtain pure O2;
3. The half-cell reaction of cathode and anode is: cathode: H2O + 2e —-H2+O2- anode: O2- —-2e +1/2 O2

Author: Fuel Cell Small Classroom

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