The most important thing in the hydrogen supply chain is the production and supply of hydrogen that supports fuel. However, there is a risk of a hydrogen explosion accident in producing, storing, supplying, and using such hydrogen. Since hydrogen is a colorless and odorless combustible gas, there is no way to confirm that the gas is leaking compared to other combustible gases such as LPG. Therefore, it is necessary to develop a hydrogen sensor that can detect and confirm that hydrogen is leaking. Currently developed hydrogen sensors have a problem in that their performance is poor because they have a simple material structure.
<br>In this study, we developed a hydrogen sensor that can solve safety problems by supplementing the problems of currently developed sensors. For the development of the proposed sensor, various composite materials were developed and applied to devices through technology transfer, and the results are presented here.
<br>The hydrogen sensor of the WO3 -Pd combination introduced here is a type using an electrical resistance signal with a simple structure. The change in the thickness of tungsten according to the change in deposition time affects the deposited Pd film, and the changing hydrogen reaction mechanism was studied.
<br>Herein, we suggest the highly reversible gasochromic hydrogen sensor with a MoO3 active layer with the multilayered Pt-Ni catalysts. The hybrid consisting of mixed-phase MoO3, and multi-layered Pt-Ni revealed a fast responsibility against H2 gas exposure. The focus of this study is to describe a chemochromic reversibility of MoO3, which is challenging to achieve in a typical approach, through the design of a layered Pt-Ni alloy catalyst and the structural change in mixed-phase MoO3.
<br>Also, this study introduced our simple route for producing hydrogen-sensitive ink based on MoS2 nanosheets. The sensing performance of the printed MoS2 -Pd sensor was demonstrated and discussed concerning the gap between Cr/Au electrodes (i.e., channel length).
<br>A study was also conducted to increase the metal wire and change the structure to a zigzag structure. The resistance of the hydrogen detection layer increased and the area in contact with hydrogen increased, resulting in improved sensitivity characteristics. A hydrogen detection device and system capable of detecting a wide range of hydrogen concentrations were studied using the resulting sensor.
