| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 102 === In recent years, environmental pollution becomes a growing issue due to excessive dependence on fossil fuels. To solve the problem, hydrogen is an ideal alternative, for it produces few pollutants during combustion process. On the other hand, the hydrogen, an ideal energy carrier, has a great potential on fuel cell applications. Therefore, researches on improvement of hydrogen storage characteristics are needed, including capacity, operating temperature and pressure.
The present research is divided into two parts, experiment and simulation. The main purpose is to develop nanomaterials for hydrogen storage. In experimental part, the composite hydrogen storage materials mixed with ZrO2 and graphene or carbon nanotubes are developed. Moreover, the influences on the enhancement of hydrogen storage capacity are analyzed. In the simulation part, molecular dynamics model is used to study the movement of hydrogen atoms in the metal structure and the change in the mechanism.
In conclusion, ZrO2 improves the absorption and desorption kinetics, holding up to 5 wt.% hydrogen storage capacity, while carbon materials reduces the operating temperature for more secure experimental process. On the other hand, the molecular dynamics model provides a more precise understanding on the atomic movement mechanism. Above all, along with all the results, some important experimental parameters are proposed as the reference for future research.
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