A cobalt–manganese layered oxide/graphene composite as an outstanding oxygen evolution reaction electrocatalyst
Hiroaki Kobayashi, Yuuki Sugawara, Takeo Yamaguchi, Itaru Honma
Abstract
To enhance the oxygen evolution reaction mass activity of cobalt-manganese layered oxide (CMO), we develop a one-pot synthetic process to anchor CMO onto graphene sheets (CMO/G). Its mass activity is 66-fold higher than that of physically mixed bare CMO with graphene and even better than those of previously reported graphene-supported first-row transition metal oxide-based electrocatalysts. The remarkable mass activity is attributed to the excellent intrinsic activity of CMO, small and well-dispersed CMO nanosheets on graphene sheets and hydrophilized graphene due to the synthetic process. Furthermore, CMO/G exhibits excellent stability.
Topics & Concepts
GrapheneElectrocatalystOxygen evolutionManganeseCobaltCobalt oxideOxideManganese oxideInorganic chemistryComposite numberMaterials scienceOxygenChemical engineeringWater splittingChemistryCatalysisNanotechnologyElectrochemistryElectrodeMetallurgyComposite materialOrganic chemistryPhysical chemistryPhotocatalysisEngineeringElectrocatalysts for Energy ConversionAdvanced battery technologies researchFuel Cells and Related Materials