Hydrogen has been widely attracted as a renewable energy carrier to replace fossil fuel that causes the greenhouse effect. Fuel cell system to convert H2 to electricity is intensively studied because a process in the energy circulation is carbon free. Hydrogen has been widely attracted as a renewable energy carrier to replace fossil fuel that causes the greenhouse effect. Fuel cell system to convert H2 to electricity has been studied because of minimization of the use in carbon.
For the extensive use of the upcoming future energy, infrastructures must be achieved such as storage, transportation, and supply before commercial use. Moreover, hydrogen has nervous issues that involve a characteristic in odorless, colorless and flammable. Among their properties, the explosive characteristic is most nervous consideration, and the problem must be solved for the safety of the worker and ordinary people.
For the safety issues, we developed a gasochromic hydrogen sensor. The coloration sensor is divided by reversible and irreversible type. The behavior of each sensor depends on their recovery, and active layer that plays a vital role for the coloration with the reduction and oxidation. In here, the coloration sensor has its own goal, one is for real-time response, and another is for the permanent record of H2 leakage without recovery even after a long time. For the achievement of the goal, various active materials are used such as oxides and chalcogenides with the catalyst that dissociates H2 molecules to a hydrogen atom.
In contrast to the coloration sensor for safety, an electrical hydrogen calibration sensor is designed for accurate wide-range hydrogen concentration, which is fabricated with the standard semiconductor fabrication process. In this study, the sensors are fabricated with the various method and analyzed with that electrical, optical and chemical characterization. High performable coloration and electrical sensors show remarkable H2 response in their detecting method. This kind hydrogen sensors will contribute future hydrogen economy.
