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Liangbing Hu of the University of Maryland, College Park, and coworkers have now developed an “electron battery” that works the other way around, using an internal electron flow to produce an external ion current (Nat. Commun. 2017, DOI: 10.1038/ncomms15609).
Such a device could stimulate nerve-cell signaling or muscle movement in people with nervous system or motor impairments. It could help researchers measure ionic processes in cells, and an implantable version could controllably dose lithium ions to people with bipolar disorder.
The electron battery’s internal circuit consists of a lithium metal anode and vanadium oxide cathode in separate electrolyte-filled glass tubes, connected by an electron-conductive wire and sealed with ion-exchange membranes. The ion-exchange membranes are connected to Kentucky bluegrass stems soaked in a salt solution containing the ion to be transported, such as lithium, sodium, potassium, or calcium. And the stems are dipped in an electrolyte solution containing cells.
The chemical potential difference between the electrodes causes anode-to-cathode flow of electrons through the wire and ions through the external circuit. Ions passing through the cell solution also generate an electric field that can induce the flow of ions, such as calcium, through ion channels in the cells. Cells spiked with a calcium-responsive fluorescent protein glowed more intensely when the researchers passed an ion current through them.
“The work’s real value is in its promised biocompatibility,” comments Ping Liu of the University of California, San Diego, an expert on batteries and energy storage. He thinks researchers should try to develop a broader range of materials to transmit ion flow, in addition to the grass stems. Hu says his group is indeed pursuing such research.
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