Widening of the electroactivity potential range by composite formation – capacitive properties of TiO2/BiVO4/PEDOT:PSS electrodes in contact with an aqueous electrolyte

Composites based on the titania nanotubes were tested in aqueous electrolyte as a potential electrode material for energy storage devices. The nanotubular morphology of TiO2 was obtained by Ti anodization. TiO2 nanotubes were covered by a thin layer of bismuth vanadate using pulsed laser deposition....

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2019, Vol.10 (1), p.483-493
Main Authors: Trzciński Konrad, Szkoda Mariusz, Nowak, Andrzej P, Łapiński Marcin, Lisowska-Oleksiak Anna
Format: Article
Language:English
Subjects:
Aqueous electrolytes
Bismuth oxides
bismuth vanadate (BiVO4)
Capacitance
Carbon
Composite materials
Electroactivity
electrochemical activity
Electrode materials
Electrodes
Electrolytes
Energy
Energy storage
Full Research Paper
Hydrogenation
Morphology
Nanoscience
Nanotechnology
Nanotubes
PEDOT:PSS
Polymers
Pulsed laser deposition
Pulsed lasers
supercapacitors
titania nanotubes
Titanium
Titanium dioxide
Vanadates
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Summary:Composites based on the titania nanotubes were tested in aqueous electrolyte as a potential electrode material for energy storage devices. The nanotubular morphology of TiO2 was obtained by Ti anodization. TiO2 nanotubes were covered by a thin layer of bismuth vanadate using pulsed laser deposition. The formation of the TiO2/BiVO4 junction leads to enhancement of pseudocapacitance in the cathodic potential range. The third component, the conjugated polymer PEDOT:PSS, was electrodeposited from an electrolyte containing the monomer EDOT and NaPSS as a source of counter ions. Each stage of modification and deposition affected the overall capacitance and allowed for an expansion of the potential range of electroactivity. Multiple charge/discharge cycles were performed to characterize the electrochemical stability of the inorganic–organic hybrid electrode. Capacitance values higher than 10 mF·cm−2 were maintained even after 10000 galvanostatic cycles (i c = i a = 0.5 mA·cm−2).
ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.10.49