Chemical hydrogen storage involves the use of chemical compounds to safely store and release hydrogen gas. This method typically utilizes materials like metal hydrides or chemical hydrides, which can absorb hydrogen at certain conditions and release it when needed. This approach is advantageous because it allows for higher storage densities compared to traditional gas cylinders. The process of chemical hydrogen storage often requires specific temperatures and pressures to facilitate the absorption and release of hydrogen. Researchers are exploring various materials and methods to improve efficiency and reduce costs, making this technology a promising option for applications in fuel cells and renewable energy.