Researchers at NIST have devised a way to eliminate a long-standing problem affecting our understanding of both living cells and batteries. When a solid and an electrically conducting liquid come into contact, a thin sheet of charge forms between them. Although this interface, known as the electrical double layer (EDL), is only a few atoms thick, it plays a central role in a wide range of systems, such as keeping living cells nourished and maintaining the operation of batteries, fuel cells, and certain types of capacitors. The NIST researchers have now mapped variations in voltage across a sheet of EDL with nanoscale precision by using a thin membrane of graphene.
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