Mamoru Senna, Solid-state oxygen abstraction from stable oxides for energy storage materials
YUCOMAT 2021
Herceg Novi, Montenegro, 2021
YUCOMAT 2021
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YUCOMAT 2021
Competition : : Best Poster Presentation
YUCOMAT 2021
Competition : : Best Poster Presentation
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Competition : : Best Poster Presentation
YUCOMAT 2021
Yury Gogotsi - Award for a Lasting and Outstanding Contribution to Materials Science and Engineering
YUCOMAT 2021
Herceg Novi, Montenegro, 2021
YUCOMAT 2021
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Herceg Novi, Montenegro, 2021
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Audience - outside
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Discussion
YUCOMAT 2021
Herceg Novi, Montenegro
YUCOMAT 2021
In Between
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Herceg Novi, Montenegro
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Audience
YUCOMAT 2021
Herceg Novi, Montenegro

Mamoru Senna

Keio University, Yokohama, Japan Faculty of Science and Technology, Hiyoshi, Yokohama 223-8522, Japan

Oxygen deficient oxide materials, including less stable oxides of lower oxidation number, are of great technological significance. They are conventionally prepared from stable oxides by heating under reducing atmosphere. Opposite processes, i.e. from metals by sparingly oxidizing under controlled oxygen partial pressure are less popular but some attempts were also made. Abstraction of lattice oxygen from stable oxides, mostly with highest oxidation number, is not just a simple reduction. Mechanisms of such phenomena are well documented in the interests of semiconductor technology and catalytic activity. However, such accumulated knowledges are not always taken over for the preparative methods of modern functional materials. When electrophilic species are coexisting and participate in such a preparative process, abstraction of lattice oxygen creates oxygen vacancies, leading to subsequent reduction of the oxides. The same principle is directly extended to the anion exchange, e.g. toward oxyhalides when an electrophilic materials we use contain halogens. The presentation is based on the related recent studies carried out by the author and his colleagues on V2O5, TiO2, SiO2 and SnO2. Some new insights why and how are those less stable oxides exhibit their functionalities are discussed in view of their application to energy storage devices, among others thermal energy storage via latent heat during phase change, and Li-ion battery anode is briefly referred.

Keywords

Oxygen deficient oxides, Oxygen abstraction, Electrophilic species, Oxygen deficient oxides, Energy storage materials

Plenary lectures - YUCOMAT 2018

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