Capacitors that rapidly store and release electric energy are key components in modern electronics and power systems. However, the most commonly used ones have low energy densities compared to other storage systems like batteries or fuel cells, which in turn cannot discharge and recharge rapidly without sustaining damage.

Now, as reported in the journal Science, researchers have found the best of both worlds. By introducing isolated defects to a type of commercially available thin film in a straightforward post-processing step, a team led by researchers at the Department of Energy's (DOE) Lawrence Berkeley National Laboratory (Berkeley Lab) has demonstrated that a common material can be processed into a top-performing energy storage material.

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