Hydrogen is attracting great attention as a clean, next-generation energy source with the expansion applications of household fuel cells (ENE-FARM) and fuel cell vehicles (FCV). However, to realize a hydrogen energy society, it is essential to grow beyond hydrogen production systems based on fossil fuels and develop advanced technology to produce hydrogen more efficiently with low cost from energy sources but without CO2 emission.
Among various hydrogen production ways, water is the most favorable raw material from the viewpoint of reducing the impact on the environment, and also keeping in mind the future possibilities of hydrogen production utilizing renewable energy (solar power, wind power, etc.). The objective of the present project is to develop an inexpensive hydrogen generation technology from water splitting.
The electrodes are the indispensable parts in the water electrolysis. Our electrodes exhibit improved performance compared to the conventional ones. We are trying to simplify the manufacture process and decrease the overpotential. As a result of intensive studies to achieve it, we have developed various low-cost electrocatalysts with high performances by using the facile preparation ways such as hydrothermal synthesis and electrodeposition. All these have applied patents.
Electrocatalysts that have been proposed in the past only exhibited good performance under some specific conditions. For example, many Electrocatalysts cannot fully manifest themselves unless used in an electrolyte within a specific pH range. In other words, although when used at a certain pH, excellent hydrogen generation efficiency and durability are demonstrated, in other different pH ranges of the electrolyte, the hydrogen generation efficiency and durability may be reduced suddenly. In particular, if the electrolyte is nearly neutral, the conventional electrocatalysts may show reduced hydrogen generation efficiency and durability. Considering this viewpoint, it was desirable to develop an electrocatalysts capable of efficiently generating hydrogen in a wide pH range with excellent durability.
Our research aims are to provide such electrocatalysts that can generate hydrogen with high efficiency in a wide pH range and also have excellent durability.