Proton-assisted creation of controllable volumetric oxygen vacancies in ultrathin CeO2−x for pseudocapacitive energy storage applications

Abstract

Two-dimensional pseudocapacitors may benefit portable electronic devices but require improved energy and power densities. Here, the authors achieve high volumetric capacitance in ultrathin films with oxygen vacancies that enhance electron conduction and intercrystallite water that promotes proton conduction.