Transition metal-based high entropy alloy microfiber electrodes: Corrosion behavior and hydrogen activity

This contribution reveals ultra-high corrosion resistance of high entropy alloys (HEAs), i.e. Ti20Zr20Nb15V15Hf15Ta15 of 1.85 µm yr–1 in alkaline environment, adverting their use for battery/fuel cell components. Formation of several nanometers passive oxide layer confirmed by scanning transmission...

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Bibliographic Details
Published in:Corrosion science 2021-12, Vol.193, p.109880, Article 109880
Main Authors: Sarac, Baran, Zadorozhnyy, Vladislav, Ivanov, Yurii P., Spieckermann, Florian, Klyamkin, Semen, Berdonosova, Elena, Serov, Mikhail, Kaloshkin, Sergey, Greer, A. Lindsay, Sarac, A. Sezai, Eckert, Jürgen
Format: Article
Language:English
Subjects:
Alkaline corrosion
Corrosion resistance
Corrosion resistant alloys
EIS
Fuel cells
Gas-solid reactions
High entropy alloy
High entropy alloys
Hydrogen storage
Microfibers
Passive film
Saline environments
Scanning transmission electron microscopy
STEM
Surgical instruments
Titanium oxides
Transition metal alloys
Transition metals
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Summary:This contribution reveals ultra-high corrosion resistance of high entropy alloys (HEAs), i.e. Ti20Zr20Nb15V15Hf15Ta15 of 1.85 µm yr–1 in alkaline environment, adverting their use for battery/fuel cell components. Formation of several nanometers passive oxide layer confirmed by scanning transmission electron microscopy accounts for corrosion resistance which increases with TiOx content. Cathodic Tafel slope of 67 mV dec–1 and large transfer coefficient of 0.82 obtained for Ti20Zr20Nb20V20Ta20 suggest its use for hydrogen electrocatalysis. High amounts of hydrogen storage, 1.7 wt% in Ti25Zr25Nb15V15Ta20, were confirmed by gas-solid reactions. This HEA also has high corrosion resistance in acidic and saline environments ideal for coatings and surgical tools/implants. [Display omitted] •Ultra-high corrosion resistance down to 1.85 µm yr–1 of TiZrNbVTa(Hf) HEAs in 1 M KOH.•Formation of a few nanometers passive oxide layer accounts for corrosion stability.•High hydrogen activity due to low cathodic Tafel slope & large transfer coefficient.•Gas-solid reactions confirm high hydrogen storage of 1.7 wt%.•High corrosion stability in 0.5 M H2SO4 (0.148 mm yr–1) & 0.9 wt% NaCl (0.081 mm yr–1).
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109880