Anticipating the upcoming electrified and hydrogen energy society, we are tackling the development of safe and secure fuel cells with high efficiency.
1Metal-Supported SOFC(Solid Oxide Fuel Cell)
SOFCs operate at the highest temperatures (typically 700-1000 ℃) and have the highest efficiencies (45-65%) among all the fuel cell types.
However, there are the following challenges.
Longer start-up and shut-down times due to high operating temperature
Low durability due to high thermal stress
We are developing Metal-supported SOFC to solve these challenges.
Conventional SOFC： Anode-supported type
SOFCs have the highest power generation efficiency among all the fuel cell types and attract attention as one of technologies for mitigation of global warming.
They are roughly divided into two types: Proton-conducting type and Oxide ion conducting type. Oxide ion conducting type has already been achieved and available on the market.
Proton-conducting type makes it possible to improve fuel utilization and achieves higher efficiency, because H2O is produced on the cathode side accompanied by power generation. (Refer to figures below)
We are tackling the development of Proton-conducting SOFC.
Conventional type： Oxide ion conducting type
Fuel electrode：2H2 + O2- → 2H2O + 4e-
Air electrode：O2 + 4e- → 2O2-
Fuel electrode：2H2 → 4H + 4e-
Air electrode：4H + O2 + 4e- → 2H2O
Organisms oxidize sugars to CO2 through complex enzyme reaction systems. Utilizing this highly efficient energy metabolism mechanism, we are conducting R&D on "biofuel cells" that uses glucose as fuel. We are aiming to generate electricity by non-burning fuel such as sugar or organic acid.