Nature of the Electrical Double Layer on Suspended Graphene Electrodes.

ABSTRACT: The structure of interfacial water near suspended graphene electrodes in contact with aqueous solutions of Na₂SO₄, NH₄Cl, and (NH₄)₂SO₄ has been studied using confocal Raman spectroscopy, sum frequency vibrational spectroscopy, and Kelvin probe force microscopy. SO₄^2- anions were found to preferentially accumulate near the interface at an open circuit potential (OCP), creating an electrical field that orients water molecules below the interface, as revealed by the increased intensity of the O-H stretching peak of H-bonded water. No such increase is observed with NH₄Cl at the OCP. The intensity of the dangling O-H bond stretching peak however remains largely unchanged. The degree of orientatio

SUBMITTER: Yang S 

PROVIDER: S-EPMC9335527 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature