Use A Small Amount Of Metal To Extend The Life Of Fuel Cells
- Dec 21, 2018 -
Researchers have described a new technique to improve the chemical stability of electrode materials, which can be extended by using very small amounts of metal. Using computational chemical and experimental data, the team observed that the local compression state around Sr atoms in the perovite electrode lattice weakened the strength of the sr-o bond and promoted strontium separation.
The correlation between lattice strain, strontium segregation and electrode reaction
Fuel cell is a key to the future of energy technology, can become a green renewable energy, especially made of ceramic material of solid oxide fuel cell, due to its biomass, LNG and LPG, the ability of all forms of fuel directly into electricity by more and more attention of researchers at KAIST describes a new technology, improve the chemical stability of the electrode material, can use very small amounts of metal to prolong lifeCore factor of solid oxide fuel cell performance is the cathodic oxygen reduction reaction, usually used in cathode oxides with perovskite structure (ABO3), however, although in the initial operation of perovskite oxide with high performance, but its performance decreases with time, limiting its use for a long time, especially in the cathode needed to run the condition of high temperature oxidation state leads to surface segregation phenomenon, including strontium oxide (SrOx) as the second phase on the surface oxide accumulation, resulting in a decline in performance of electrode using computational chemistry and experimental data, the department of materials science and engineering WooChulProfessor Jung team observed, perovskite electrodes around the Sr atoms in the crystal lattice of local compression state reduces the Sr - O bond strength, thus promote the separation of strontium, the team found perovskite oxides in the local changes of strain distribution is the main reason for the separation of strontium surface based on these findings, the team in oxide doped with different size of metal to control the cathode materials of lattice strain degree, and effectively suppress strontium segregation WooChul professor Jung said.This technology can be achieved by adding a small number of metal atoms to the material synthesis process without additional process. I hope this technology will be successful in developing highly durable perovskite oxide electrodes.