Carbon dioxide, called CO2
A potential electric-charge carrier that comes to mind, is carbon dioxide, called CO2. It is a molecule made up of two oxygen atoms attached to a carbon atom. Both atoms have a large number of electrons in their outer electron shells, for a total of 16 or twice that of a water molecule. The attachment of the atoms is perfectly centrosymmetric so that the molecule has no dipole effect. It is unknown to what degree CO2 can be eclectically ionized by stripping one of its electrons that would result in bi-polarity. To my knowledge, no work has been done in this area, which theoretically has a promising potential, though CO2 is used in a wide range of industrial applications, such as an inert gas in welding and fire extinguishers, as a pressurizing gas in oil recovery, as a chemical feedstock, even as a refrigerant, and in liquid form as a solvent in the decaffeination of coffee as it enables supercritical drying. It is even added to drinking water and carbonated beverages including beer and champagne to give them a sparkle. The frozen solid form of CO2, known as "dry ice" is used as a low temperature refrigerant and as an abrasive in Dry-Ice blasting.