Present in abundant nature, hydrogen can be a promising clean fuel source, but due to some problems its application is not yet able to obtain wide distribution. Scientists from South Korea have developed a new system for producing gas from water, which, according to them, is much more effective than other electrolysis technologies.
The basis of his invention research team, which included scientists from Olshanskogo national Institute of science and technology, Korea Institute of energy research and female University Salmon, took an existing design called a “solid oxide electrolysis cell” (SOEC).
In improved models, as well as in other electrolytic cells, electric current splits the water into hydrogen and oxygen, which are then captured separately. The difference lies in the fact that in the proposed setting both electrodes are solid, and the electrolyte serves as a conductor of ions.
In systems using liquid electrolytes, it is necessary to constantly monitor the fluid level. In addition, over time, liquid electrolytes cause corrosion of other components. Solid state electrolytic cells are deprived of these disadvantages, work at higher temperatures and can extract electricity from this heat, respectively, the energy consumption during their operation are minimal.
Until today, there were two variant cell SOEC, which used different electrolytes: the first design is allowed to pass only ions of oxygen, and the hydrogen ions. Such one-way traffic limited the number of hydrogen production and required improvements.
Retaining all the advantages of solid-state electrolyzer, the researchers have developed a new high-performance hybrid system (Hybrid-SOEC), which uses a conductor with mixed ions for simultaneous transfer as the negatively charged oxygen ions and positively charged hydrogen ions (protons).
Using the mixed ionic conductor and the electrodes of the layered perovskite, Hybrid-SOEC made of 1.9 liters of hydrogen per hour, operating at a voltage of 1.5 V and a cell temperature of 700° C. the Researchers said that it is four times more efficient than existing systems for water electrolysis and after continuous operation for 60 hours signs of deterioration in the performance was completely absent.
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