Publication detail

Porous-anodic-alumina-templated Ta-Nb-alloy oxide coatings via the magnetron-sputtering anodizing as novel 3D nanostructured electrodes for energy-storage applications

MOZALEV, A. BENDOVÁ, M. GISPERT-GUIRADO, F. LLOBET, E. HABAZAKI, H.

Original Title

Porous-anodic-alumina-templated Ta-Nb-alloy oxide coatings via the magnetron-sputtering anodizing as novel 3D nanostructured electrodes for energy-storage applications

Type

journal article in Web of Science

Language

English

Original Abstract

The Ta-Nb thin alloy films were magnetron sputter-deposited over a low-aspect-ratio nanoporous anodic-alumina template formed in 0.05 M tartaric acid solution at 250 V and modified by the pore-widening technique to enlarge the pores up to 500 nm. The alloy coated the pores evenly, thus forming a 3D continuous conducting nanofilm on the template. Partially anodizing the templated alloy in a borate buffer solution of pH 7.5 generated a compact amorphous mixed-oxide anodic film thickening proportionally to the applied voltage. An unusual two-layered structure with a sharp electrical interface revealed in the 3D oxide films anodized to 30–130 V, comprising a low-resistivity layer superimposed on the high-resistivity layer, is explained by an immobile negative space charge in the outer film part. The air-annealing at moderate temperatures releases the space charge and transforms the two layers into a high-resistivity single layer having substantially improved dielectric properties and thermostable (up to 250 deg) capacitance of 1.2 F cm−2 achieved for the film anodized to practical 50 V. The 3D films having up to 4.5 times enlarged effective surface area can be utilized as novel metal/oxide nanostructured electrodes for electrolytic microcapacitors suitable for classical electronic circuits and energy-storage applications.

Keywords

porous anodic alumina, tantalum-niobium alloy, anodic oxide films, 3D nanostructures, electrolytic capacitor

Authors

MOZALEV, A.; BENDOVÁ, M.; GISPERT-GUIRADO, F.; LLOBET, E.; HABAZAKI, H.

Released

26. 6. 2024

Publisher

Elsevier

Location

PO BOX 564, 1001 LAUSANNE, SWITZERLAND

ISBN

1879-3347

Periodical

SURFACE & COATINGS TECHNOLOGY

Year of study

489

Number

1

State

Swiss Confederation

Pages from

1

Pages to

14

Pages count

14

URL

https://www.sciencedirect.com/science/article/pii/S025789722400673X

Full text in the Digital Library

http://hdl.handle.net/11012/249744

BibTex

@article{BUT189816,
  author="Alexander {Mozalev} and Mária {Bendová} and Francesc {Gispert-Guirado} and Eduard {Llobet} and Hiroki {Habazaki}",
  title="Porous-anodic-alumina-templated Ta-Nb-alloy oxide coatings via the magnetron-sputtering anodizing as novel 3D nanostructured electrodes for energy-storage applications
",
  journal="SURFACE & COATINGS TECHNOLOGY",
  year="2024",
  volume="489",
  number="1",
  pages="1--14",
  doi="10.1016/j.surfcoat.2024.131042",
  issn="1879-3347",
  url="https://www.sciencedirect.com/science/article/pii/S025789722400673X"
}