Nowadays, according to the increasing needs of humans for progress and development and its requirement for energy, it has led to the shortage and exhaustion of the common and used fuels in the world, i.e. fossil fuels. Therefore, mankind has thought of replacing this fuel and using more energy efficiency. Renewable energies have received a lot of attention as sources to estimate this need. Among renewable energies, hydrogen as a source of clean energy with high potential has a promising perspective to replace fossil fuels. Things that must be addressed in this field are as below:
0) Choosing the best method for storing hydrogen and using it 1) Choosing suitable substrate and materials for safe storage of hydrogen in it and its effective use in the next steps.
3) Paying attention to costs and choosing cheap and affordable routes
The efforts made in this project were in line with the realization of the above three basic items. In this project, a porous silicon substrate decorated with palladium metal nanoparticles and coated with graphene quantum dots was produced and its storage capacity was investigated by chronopotentiometry and cyclic voltammetry methods based on the electrochemical method. Considering the advantages and disadvantages of graphene production methods, the hydrothermal prosses was chosen because it is environmentally friendly and at the same time easy and cheap. Also, electrochemical and photoelectrochemical methods have been used to produce porous silicon substrate due to their cheapness and availability. In this project, porous silicon and graphene-quantum dots have been selected as hydrogen absorbers as well as palladium metallic nanoparticles as absorbers and catalysts. The reasonable price of the prepared substrate of porous silicon decorated with palladium and coated with graphene quantum dots compared to other hydrogen absorbers, due to the fact that the manufacturing and preparation steps are simple and low-cost for storage tests is on the ag