[논문]Effects of annealing on electrochemical performance in graphene/V2O5 supercapacitor

Lee, Seung-Mo; Park, Yong-Jin; Lam, Do Van; Kim, Jae-Hyun; Lee, Kyubock

doi:10.1016/j.apsusc.2020.145626

[해외논문] Effects of annealing on electrochemical performance in graphene/V2O5 supercapacitor

Applied surface science, v.512, 2020년, pp.145626 -

Lee, Seung-Mo (Department of Nanomechatronics, University of Science and Technology (UST)) , Park, Yong-Jin (Department of Nanomechanics, Korea Institute of Machinery & Materials (KIMM)) , Lam, Do Van (Department of Nanomechanics, Korea Institute of Machinery & Materials (KIMM)) , Kim, Jae-Hyun (Department of Nanomechatronics, University of Science and Technology (UST)) , Lee, Kyubock (Department of Energy Science and Technology, Graduate School of Energy Science and Technology (GEST), Chungnam National University)

Abstract ▼ AI-Helper

Abstract Multilayered graphene films uniformly coated with a thin V2O5 layer (graphene/V2O5 composite) is prepared through a combination of laser reduction and low-temperature atomic layer deposition (ALD). In order to verify the effect of the crystallinity on the electrochemical performance of the graphene/V2O5, first, we perform high-temperature annealing and then the detailed comparative study between amorphous and crystalline V2O5 coated graphene is carried out. We observe that the graphene coated with amorphous V2O5 can ensure far better performance as a supercapacitor electrode (i.e. specific capacitance, energy density, and cyclic stability) than the crystalline counterpart. Contrary to the initial intuition, the annealing is revealed to be less helpful for enhancing the overall electrochemical performance of the graphene/V2O5 composite electrode, similar to the case of the battery. Highlights Annealing is less helpful for enhancing the electrochemical performance in the graphene/V2O5 supercapacitor. CO2 laser processing offers fast and effective way to produce the multilayered graphene. Atomic layer deposition enables uniform coating of V2O5 on the multilayered graphene. Graphical abstract [DISPLAY OMISSION]

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