Core–shell structured CeO2@MoS2 nanocomposites for high performance symmetric supercapacitors

Abstract

MoS₂ ultrathin nanosheet-coated CeO₂ hollow sphere (CeO₂@MoS₂) nanocomposites with a 3D core–shell architecture were successfully prepared via a facile wet chemistry strategy. The core–shell structured CeO₂@MoS₂ nanocomposites were systematically characterized using XRD, SEM, TEM and XPS analysis techniques. As a proof of concept application, symmetric supercapacitors were assembled using the CeO₂@MoS₂ nanocomposites, and aqueous 1 M Na₂SO₄ or 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid as the electrolyte. The as-obtained CeO₂@MoS₂ nanocomposites exhibited superior performance in symmetric supercapacitors.