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[materialsscienceandengineering]

Mechanism of oxygen activation on barium-containing perovskite materials

A research team led by Prof. Yang Weishen and Prof. Zhu Xuefeng from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) has revealed the mechanism of oxygen activation on Barium-containing perovskite materials.

The researchers discovered that BaO/BaO2 nanoparticles precipitated on the surface of Ba-containing materials under high-temperature oxygen-rich conditions had an ultra-high activity for oxygen activation, which clarified the mechanism of high-temperature oxygen activation and transport on the surface of Ba-containing perovskite oxides.

This study was published in Science Advances on April 13.

In 2000, the DICP team invented an oxygen-permeable membrane material named Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF). Due to its good catalytic activity towards oxygen activation, BSCF has become a representative material for oxygen permeation and has been widely used in solid oxide fuel cells, oxygen reduction reactions, and oxygen evolution reactions.

Read more.

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Science and Chemistry Classes

Overcoming a hurdle on the path to renewable-energy storage

by Ecole Polytechnique Federale de Lausanne

15/01/2022

Electrolytic cells work by using electricity to trigger an electrolysis reaction that splits water molecules into hydrogen and oxygen. The electricity can then be recovered by reversing the reaction and recombining the hydrogen and oxygen into water.

Understanding how catalysts work

Catalysts are used to speed up electrocatalytic reactions without being consumed in the process. The catalysts used for water electrolysis are metal oxides, some of which tend to work better than others—although the exact reason remains unknown. "We've been able to see that during water electrolysis some oxides are particularly effective, robust, and stable," says Vasiliki Tileli, an assistant professor and head of EPFL's Laboratory for in situ Nanomaterials Characterization with Electrons. "But we can't really explain why these oxides function better, since we don't know exactly what happens to the catalyst during the reaction."

A new-generation catalyst

In order to find this out, Tileli and Tzu-Hsien Shen, a Ph.D. student at her lab, observed water electrolysis reactions under an electron microscope, examining how the catalyst behaves during the entire process by generating nanoscopic-scale images. They used a perovskite-type oxide catalyst called BSCF. "It is an intriguing catalyst with exceptional water-splitting properties," says Tileli. "Most of the catalysts currently in use, like those made from iridium and ruthenium, are effective but very expensive and their supply is limited. Alternatives will eventually have to be discovered."

Tileli and Shen captured real-time images of BSCF particles during each step of the electrolysis cycle. They saw molecular oxygen appear, meaning the reaction was taking place, and confirmed that the process was reversible. They also saw that BSCF is particularly robust.

Surfaces that switch from hydrophobic to hydrophilic

In addition, the research team found that the particles' surface atoms redistribute during the reaction, changing the surface properties. As a result, the particles interact with their surroundings differently at various steps in the electrolysis cycle. The surface is hydrophobic (i.e., water-repellent) during some steps, while during others it's hydrophilic (i.e., attracted water). "These observations are unique," says Tileli. "We suspected that the particle surface might be changing, but this had never before been observed at the nanoscopic scale and in real time." The ability of a material to switch back and forth between the hydrophobic and hydrophilic states is highly valuable to engineers and can be used in a variety of applications, such as sensors, water purification systems, and self-cleaning surfaces. The scientists' findings are published in Nature Catalysis.

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[69creator]

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