Controlled electrochemical hydridation of Ti surfaces – optimisation and electrochemical properties

Tereza Bautkinova, Tomas Bystron, Miloslav Lhotka, Johannes Häusler, Darya Rudomilova, Meital Shviro, Karel Bouzek

Research output: Contribution to journalArticlepeer-review

Abstract

Ti is used as a construction material in many applications including electrodes in various electrochemical technologies due to its high corrosion stability provided by the stable oxide layer on the surface. However, this oxide layer is also the reason for its resistivity causing high interfacial resistance between components and energy losses. This problem can be solved by various surface modifications such as acid etching or coating with a layer of precious metals. In this study, we present a novel method for controlled hydridation of Ti materials based on a combination of acid etching and cathodic hydridation aimed primarily for surface modification of Ti components for proton exchange membrane water electrolyser. Cathodic polarisation represents the means to increase the amount of Ti hydride and to tune its properties to obtain a Ti surface with low interfacial resistance and preserved corrosion stability. The study investigated the effects of concentration, temperature, time, and current density on cathodic polarization in H2SO4 electrolytes. The resulting samples were characterized by X-ray diffractometry, X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, Kelvin probe and temperature-programmed desorption. This allowed finding interesting correlations between the surface composition of the Ti samples and their electrochemical properties.

Original languageEnglish
Article number143649
JournalElectrochimica Acta
Volume475
DOIs
StatePublished - 20 Jan 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023

Funding

This study was supported by the Grant Agency of the Czech Republic under project no. GC20– 06422 J and Technology Agency of the Czech Republic under the M-ERA.Net Programme , project No. TH82020001 . The experiments were performed with a help of equipment purchased within framework of the European Regional Development Fund Project ‘ Fuel Cells with Low Platinum Content ’ (No. CZ.02.1.01/0.0/0.0/16_025/0007414 ).

FundersFunder number
Grantová Agentura České RepublikyGC20– 06422
European Regional Development FundCZ.02.1.01/0.0/0.0/16_025/0007414

    Keywords

    • Contact resistance
    • Corrosion
    • Titanium hydride
    • Titanium passivation

    Fingerprint

    Dive into the research topics of 'Controlled electrochemical hydridation of Ti surfaces – optimisation and electrochemical properties'. Together they form a unique fingerprint.

    Cite this