Mamoru Senna, Reduction of stable oxides under mechanical stressing with hydrocarbon species toward energy storage materials
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference

Mamoru Senna

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


Oxygen deficient oxide materials are of great technological significance. They are conventionally prepared either from stable oxides by heating under reducing atmosphere or from metals by sparingly oxidizing under controlled oxygen partial pressure. Abstraction of lattice oxygen from stable oxides, mostly with highest oxidation number, is another option. Although related mechanisms were extensively explored in the interests of catalytic activity, they are not always taken over for the preparative methods for oxygen deficient metal oxides.

When electrophilic species, like organic hydrocarbon species are brought together with stable oxides, abstraction of lattice oxygen could take place with simultaneous oxidative decomposition of such hydrocarbons. Once the lattice oxygen is abstracted, oxygen vacancies are created to destabilize the oxides. Thus, the local reduction process becomes self-catalytic and penetrates the entire mass of the mixture. The process is drastically accelerated when mechanical stress is exerted onto the oxide – hydrocarbon mixture. 

By a proper choice of the mechanochemical condition and with subsequent chemical treatments, the rest of the organics could be eliminated or turn into various carbon-containing species, resulting in oxide-carbon-based nanocomposites.

The presentation is based on the related studies carried out by the author and his colleagues on V2O5, TiO2, SiO2 and SnO2. 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.

Experimental studies were supported by Profs. M. Fuji, T. Shirai, N. Suzuki, Dr. C. Takai and Mr. N. Takezawa. The work was partially financed by Japan Science and Technology Agency under the V4-Japan Joint Research Program.

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