The article discusses various studies related to hydrogen energy and its applications. It includes an exergoeconomic analysis and multi-objective optimization of a combined flash-binary cycle for the Sabalan geothermal power plant in Iran. Additionally, it covers the exceptional hydrogen storage achieved through screening metal-organic frameworks. The assessment of strategies for the development of solid-state adsorbents for vehicular hydrogen storage is explored. Furthermore, the improvement of photofermentative biohydrogen production using pre-treated brewery wastewater with banana peels waste is highlighted. The research demonstrates the potential of hydrogen in energy systems, biofuels, renewable energy, solid-state adsorbents for hydrogen storage, and more.