The sun beams down enough energy to supply all the electricity the Earth needs, but for all our advances with renewable energy, one of the most frustrating barriers to a zero-emissions world is the lack of a great solar battery.
Solar panels are hailed as an easy, affordable step toward reducing cities' reliance on fossil fuels for electricity, but at the moment most solar panels can only produce electricity on-demand. They can store energy, but not for long enough to keep the lights on during cloudy days and long winter nights, said Nate Lewis, head of a solar fuels initiative at the California Institute of Technology.
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