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Electrochemically Reduced Graphene Oxide-Sheltered ZnO Nanostructures Showing Enhanced Electrochemical Performance Revealed by an In Situ Electrogravimetric Study
- Source :
- Advanced Materials Interfaces, Advanced Materials Interfaces, Wiley, 2019, 6 (5), pp.1801855. ⟨10.1002/admi.201801855⟩
- Publication Year :
- 2019
- Publisher :
- Wiley, 2019.
-
Abstract
- International audience; The present work is on the synthesis and characterization of vertically aligned ZnO nanostructures sheltered by electrochemically reduced graphene oxide (ERGO), i.e., ZnO@ERGO, which are directly generated on quartz resonators of microbalance sensors. The vertical orientation of the ZnO nanorods is achieved by a two‐step synthesis method involving an electrochemically grown seed layer and a subsequent hydrothermal growth. Deposited ERGO thin layer turns out to be highly effective to enhance the electrochemical performances of vertically oriented ZnO nanorods as supercapacitor electrodes. The interfacial charge storage mechanism of ZnO@ERGO electrodes with unique architecture is first studied by classical electrochemical quartz crystal microbalance (EQCM), showing a global cation‐exchange behavior in Na2SO4 electrolyte. A complementary technique, electrogravimetric impedance spectroscopy, is then used to deconvolute the EQCM response into individual contributions from Na+·H2O, SO42−, and H2O molecules, offering a quantitative picture of each participant in the charge balance process with their transfer kinetics.
- Subjects :
- Materials science
Oxide
02 engineering and technology
010402 general chemistry
01 natural sciences
law.invention
chemistry.chemical_compound
law
Electrogravimetry
[CHIM]Chemical Sciences
Supercapacitor
Nanostructured electrodes
supercapacitors
Graphene
Mechanical Engineering
[CHIM.MATE]Chemical Sciences/Material chemistry
Quartz crystal microbalance
021001 nanoscience & nanotechnology
0104 chemical sciences
Dielectric spectroscopy
chemistry
Chemical engineering
Mechanics of Materials
Electrochemical quartz Crystal microbalance
Electrode
Nanorod
0210 nano-technology
interfacial ion transfer
Subjects
Details
- ISSN :
- 21967350
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Advanced Materials Interfaces
- Accession number :
- edsair.doi.dedup.....8b8f5f13311a4ed5dcd68a880e2b843e