Scientists at Brookhaven National Laboratory are working on a way to store hydrogen using metal hydrides. These compounds can store and release hydrogen at different temperatures. One promising material is iron titanium, which could be cost-effective for storing hydrogen. They are also exploring using metal hydrides for energy storage and natural gas supplementation. A system involving the electrolysis of hydrochloric acid could be used to store hydrogen using metal hydrides. This technology could also be used for storing hydrogen in automotive systems.