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Enhanced capacitance of composite TiO2 nanotube / boron-doped diamond electrodes studied by impedance spectroscopy

Abstrakt

We report on the novel composite nanostructures based on boron-doped diamond thin film grown on top of TiO2 nanotubes. The nanostructures made of BDD-modified titania nanotubes showed an increase in activity and performance when used as electrodes in electrochemical environments. The BDD thin films (~200-500 nm) were deposited using microwave plasma assisted chemical vapor deposition (MW PA CVD) onto anodically fabricated TiO2 nanotube arrays. The influence of boron-doping level, methane admixture and growth time on the performance of Ti/TiO2/BDD electrode was studied in detail. Scanning electron microscopy (SEM) was applied to investigate the surface morphology and grain size distribution. Moreover, the chemical composition of TiO2/BDD electrodes was investigated by means of micro-Raman Spectroscopy. The composite electrodes TiO2/BDD are characterized by the significantly higher capacitive current comparing to BDD film deposited directly onto Ti substrate. The novel composite electrode of TiO2 nanotube array overgrown by boron-doped diamond (BDD) immersed in 0.1 M NaNO3 can deliver specific capacitance of 2.10, 4.79, 7.46 mF cm-2 at a scan rate of 10 mV/s for [B]/[C] ratio 2k, 5k and 10k, respectively. The substantial improvement of electrochemical performance and excellent rate capability could be attributed to synergistic effect of TiO2 treatment in CH4:H2 plasma and high electrical conductivity of BDD layer. Analysis of electrochemical impedance spectra according to electric equivalent circuit allows to determine surface area on the basis of value of constant phase element.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
NANOSCALE nr 7, strony 551 - 558,
ISSN: 2040-3364
Język:
angielski
Rok wydania:
2015
Opis bibliograficzny:
Siuzdak K., Sawczak M., Bogdanowicz R., Sobaszek M.: Enhanced capacitance of composite TiO2 nanotube / boron-doped diamond electrodes studied by impedance spectroscopy// NANOSCALE. -Vol. 7, (2015), s.551-558
Weryfikacja:
Politechnika Gdańska

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