Nagoya University · Engineering
Professor Mitsuhiro Kubota's research lab specializes in advanced thermochemical energy storage materials, focusing on high-temperature heat storage systems using reversible chemical reactions such as CaO/CaCO3 and metal oxide spinel/delafossite couples. The lab explores low-pressure, high-efficiency heat storage through reaction kinetics and phase stability, as well as hybrid inorganic-organic phase change materials (PCMs) for low-temperature applications like domestic water heating. A key emphasis is placed on developing safe, stable, and high-capacity materials for hydrogen and thermal energy storage, including ammonia-based systems and salt hydrate composites. The research integrates materials synthesis, thermodynamic analysis, and thermal cycling stability to enable practical energy storage solutions.
Figures are computed from collected data and may differ slightly.
In order to develop a high temperature heat storage and temperature upgrading system using the CaO/CaCO3 reaction, decarbonation of CaCO3 has been carried out with thermogravimetry in the ranges of 1073–1193 K and 3–55 kPa.Calcium carbonate virtually did not decompose under the condition where the partial pressure of CO2, P, is higher than half of the equilibrium decomposition pressure of CaCO3, Pe. It implies that the present heat storage system has to be operated in pressure regions lower than
Ammonia has attracted great attention as a hydrogen carrier owing to its high hydrogen content of 17.8 wt%. However, a high pressure of approximately 1 MPa is required to store NH3 in its liquid state at room temperature. The toxicity of ammonia has raised a great deal of concern about leakage from the storage vessel to the ambient atmosphere. To solve this problem, we have focused on absorption and desorption reactions of ammonia with metal chlorides. Some metal chlorides can store NH3 in the f
Cu-based spinel/delafossite couples with Mn and Fe as second cations were synthesized using the Pechini method for medium-high temperature thermochemical energy storage. Physicochemical properties of each sample were investigated. Only CuMn2O4/CuMnO2 exhibited favorable redox behavior in the range of 500–1000 °C. Cu-based delafossite can reoxidize at a lower temperature (∼600 °C), which may be related to the existence of a MO6 octahedra structure. Through the isothermal oxidation method, CuMn2O4
Open papers in the app to read, cite, and organize with AI.
