Issue 6, 2024

Top-down surfactant-free electrosynthesis of magnéli phase Ti9O17 nanowires

Abstract

TiO2 nanowires have proven their importance as a versatile material in numerous fields of technology due to their unique properties attributable to their high aspect ratio and large surface area. However, synthesis is an enormous challenge since state-of-the-art techniques rely on complex, multi-stage procedures with expensive, specialized equipment, employing high-temperature steps and potentially toxic precursor materials and surfactants. Hence, we elucidate a simple and facile top-down methodology for the synthesis of nanowires with non-stoichiometric Magnéli phase Ti9O17. This methodology relies on the electrochemical erosion of bulk Ti wires immersed in an aqueous electrolyte, circumventing the use of environmentally harmful precursors or surfactants, eliminating the need for high temperatures, and reducing synthesis complexity and time. Using multiple techniques, including transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction, we provide evidence of the successful synthesis of ultrathin nanowires with the crystal structure of non-stoichiometric Ti9O17 Magnéli phase. The nanowire width of ∼5 nm and the Brunauer–Emmett–Teller surface area of ∼215 m2 g−1 make the nanowires presented in this work comparable to those synthesized by state-of-the-art bottom-up techniques.

Graphical abstract: Top-down surfactant-free electrosynthesis of magnéli phase Ti9O17 nanowires

Supplementary files

Article information

Article type
Paper
Submitted
05 nov 2023
Accepted
26 jan 2024
First published
27 jan 2024
This article is Open Access
Creative Commons BY license

Mater. Adv., 2024,5, 2368-2376

Top-down surfactant-free electrosynthesis of magnéli phase Ti9O17 nanowires

P. M. Schneider, C. M. Schott, D. Maier, S. A. Watzele, J. Michali<img border="0" src="https://www.rsc.org/images/entities/char_0063_0306.gif" alt="[c with combining breve]" xmlns="http://www.rsc.org/schema/rscart38" />ka, J. Rodriguez-Pereira, L. Hromadko, J. M. Macak, V. Baran, A. Senyshyn, A. Viola, F. Maillard, E. L. Gubanova and A. S. Bandarenka, Mater. Adv., 2024, 5, 2368 DOI: 10.1039/D3MA00968H

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