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Metal Hydrides Fact Sheet
Metal hydrides are coordinated complexes and/or crystal systems which reversibly bind hydrogen. The hydrogen is favorably incorporated into the complex and may be released by applying heat to the system. A major method to determine a particular complex's effectiveness is to measure the amount of hydrogen that can be released from the complex, rather than the amount it can store.
Some issues with metal hydrides are low hydrogen capacity, slow uptake and release kinetics, as well as cost. 1 The rate at which the complex accepts the hydrogen is a factor, since the time to fuel a car should ideally be minimal. Even more importantly, at the current stage of research, the rate at which hydrogen is released from the complex is too slow for automobile requirements 1 .
This technology is still a very promising method, and further research allows for the possibility of highly binding and rapid reversal rates of hydrogen gas.
[1] U.S. Department of Energy. (External Link)
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