Thumbnail
Access Restriction
Open

Author Tao, Yan ♦ Ruiyi, Li ♦ Haiyan, Zhu ♦ Zaijun, Li
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ NANOSCIENCE AND NANOTECHNOLOGY ♦ ACTIVATED CARBON ♦ ANODES ♦ CALCINATION ♦ CAPACITANCE ♦ CAPACITIVE ENERGY STORAGE EQUIPMENT ♦ CERIUM OXIDES ♦ CORALS ♦ ELECTRIC CONDUCTIVITY ♦ ELECTROCHEMISTRY ♦ ELECTRONS ♦ ENERGY DENSITY ♦ GRAPHENE ♦ MICROWAVE RADIATION ♦ MORPHOLOGY ♦ NANOPARTICLES ♦ NANOSTRUCTURES ♦ REDOX REACTIONS ♦ SYNTHESIS
Abstract Graphical abstract: The study reported the synthesis of coral-like CeO{sub 2}/GNs for supercapacitors. The unique architecture with overall connected framework and good conducting network of the graphene greatly boosts the Faradaic redox reaction. Therefore, the CeO{sub 2}/GNs delivers an excellent electrochemical performance. - Highlights: • The study reported the synthesis of CeO{sub 2}/GNs. • The graphene was woven into CeO{sub 2}, acting as a good conducting network. • The CeO{sub 2}/GNs shows a coral-like structure. • The architecture creates an overall connected framework. • The CeO{sub 2}/GNs delivers good capacitive performances. - Abstract: CeO{sub 2}/graphene was synthesized by a simple microwave method along with subsequent calcination. CeO{sub 2} nanoparticles with an average size of 68.8 nm are uniformly decorated on graphene nanosheets (CeO{sub 2}/GNs). The CeO{sub 2}/GNs displays a like-coral morphology. The architecture including overall connected framework, abundant intercrossed and interconnected nanochannels and perfect conducting network of the graphene, endows the CeO{sub 2}/GNs material with a superior electron and mass transport. As a result, the CeO{sub 2}/GNs gives a high specific capacitance of 503.4 F/g at 2 A/g and good cycle performance with 91.8% capacitance retention after 3000 cycles. Further, an asymmetric supercapacitors was assembled by using CeO{sub 2}/GNs as the positive electrode and activated carbon as the negative electrode, the asymmetric device demonstrate a favorable energy density of 30.2 Wh/kg at the power density of 750.0 W/kg and superior cycle life with 86.4% the capacitance retenion at 5 A/g after 3000 cycles.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 78


Open content in new tab

   Open content in new tab