Extended Data Figure 1: Charged monomers used in charge-selective ‘membrane’ gels.
From: An electric-eel-inspired soft power source from stacked hydrogels
a, 3-Sulfopropyl acrylate, a component of the cation-selective gel. b, (3-Acrylamidopropyl)trimethylammonium, a component of the anion-selective gel.
