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Nanostructured, Alkaline Titanate‐Converted, and Heat‐Treated Ti6Al4V Microspheres via Wet‐Chemical Alkaline Modification and their ORR Electrocatalytic Response

Wadge, Matthew D.; Bird, Matthew A.; Sankowski, Andrzej; Constantin, Hannah; Fay, Michael W.; Cooper, Timothy P.; O'Shea, James N.; Khlobystov, Andrei N.; Walsh, Darren A.; Johnson, Lee R.; Felfel, Reda M.; Ahmed, Ifty; Grant, David M.

Nanostructured, Alkaline Titanate‐Converted, and Heat‐Treated Ti6Al4V Microspheres via Wet‐Chemical Alkaline Modification and their ORR Electrocatalytic Response Thumbnail


Authors

Matthew A. Bird

Andrzej Sankowski

Hannah Constantin

Timothy P. Cooper

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JAMES O'SHEA J.OSHEA@NOTTINGHAM.AC.UK
Associate Professor and Reader in Physics

DARREN WALSH DARREN.WALSH@NOTTINGHAM.AC.UK
Professor of Chemistry

LEE JOHNSON LEE.JOHNSON@NOTTINGHAM.AC.UK
Associate Professor of Chemistry

Reda M. Felfel

DAVID GRANT DAVID.GRANT@NOTTINGHAM.AC.UK
Professor of Materials Science



Abstract

This study describes the chemical conversion and heat treatment of Ti6Al4V microspheres (Ti6_MS), and the resulting effects on their electrocatalytic properties. The wet-chemical conversion (5.0m NaOH, 60°C, 24h; Sample label: Ti6_TC) converts the top surface of the Ti6_MS powder into an ≈820nm thick sodium titanate surface. Heat-treatment (Ti6_TC_HT) at 450°C increases the stability of the surface, through partial titanate crystallization, while mitigating excess rutile formation. All samples are analyzed chemically (XPS, EDX, Raman, EELS), structurally (XRD and TEM), and morphologically (SEM, TEM), demonstrating the characteristic formation of sodium titanate dendritic structures, with minimal chemical, structural, and morphological differences due to the 450°C heat-treatment. The effect of the preparation methodology on oxygen reduction reaction (ORR) electrocatalytic performance is also tested. The introduction of the sodium titanate layer changes the mechanism of the ORR, from a mixed 4 electron/2 electron pathway to a predominantly 2-electron pathway. By maintaining the microspherical nature of the material while also tuning the surface of the material toward different reaction mechanisms, a design strategy for new electrocatalyst materials is explored.

Citation

Wadge, M. D., Bird, M. A., Sankowski, A., Constantin, H., Fay, M. W., Cooper, T. P., …Grant, D. M. (2023). Nanostructured, Alkaline Titanate‐Converted, and Heat‐Treated Ti6Al4V Microspheres via Wet‐Chemical Alkaline Modification and their ORR Electrocatalytic Response. Advanced Materials Interfaces, 10(5), Article 2201523. https://doi.org/10.1002/admi.202201523

Journal Article Type Article
Acceptance Date Dec 2, 2022
Online Publication Date Dec 2, 2022
Publication Date Feb 14, 2023
Deposit Date Feb 17, 2023
Publicly Available Date Mar 28, 2024
Journal Advanced Materials Interfaces
Electronic ISSN 2196-7350
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 10
Issue 5
Article Number 2201523
DOI https://doi.org/10.1002/admi.202201523
Keywords Alkaline ORR, alkaline titanate, nanoporous surfaces, Ti6Al4V microspheres, wet‐chemical conversion
Public URL https://nottingham-repository.worktribe.com/output/14587805
Publisher URL https://onlinelibrary.wiley.com/doi/10.1002/admi.202201523
Additional Information Received: 2022-07-11; Published: 2022-12-02

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