Submission Deadline: 31 March 2023 Submit to Special Issue
Currently, the world's energy needs rely heavily on fossil fuels, specifically coal, oil, and natural gas. Fossil fuels endanger the earth's ecology and biological systems. Using these fuels raises the CO2 concentration of the atmosphere, causing global warming and unfavourable climate shifts. Furthermore, these are finite sources of energy that will ultimately run out. There is a strong desire to locate and use renewable energy resources to replace fossil fuels as soon as possible since they are projected to have no environmental effect and guarantee energy security. One of the most sought fuels capable of replacing dwindling hydrocarbons is hydrogen. In this overview, we emphasise the current state of energy consumption, recent breakthroughs in renewable energy, and the potential of hydrogen as a future fuel. It reviews various energy systems and focuses primarily on technologies and their dependability for current and future hydrogen generation.