Structural Stability and Kinetics of Hydrogenation of β-Tantalum at Low Temperatures
Z. Yuan (TU Delft - RST/Storage of Electrochemical Energy)
H. Schreuders (TU Delft - ChemE/O&O groep)
Ewout Voorrips (Student TU Delft)
B.J.R. Dankelman (TU Delft - RID/TS/Technici Pool)
R.M. Groves (TU Delft - Group Groves)
B. Dam (TU Delft - ChemE/Materials for Energy Conversion and Storage)
L.J. Bannenberg (TU Delft - RID/TS/Instrumenten groep)
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Abstract
The development of reliable hydrogen sensing materials for subzero environments is crucial for aviation, cryogenic storage, and hydrogen infrastructure applications. In this study, we investigate tetragonal β-tantalum (β-Ta) thin films at −60 °C to assess their potential for optical hydrogen sensing. In situ X-ray diffraction (XRD) measurements reveal a reversible lattice expansion upon hydrogen exposure, with β-Ta exhibiting a smaller volumetric expansion compared to α-Ta, indicating lower hydrogen solubility. Optical transmission measurements demonstrate a monotonic and fully reversible optical response across a range of hydrogen pressures, free of any hysteresis. However, β-Ta exhibits prolonged response times at low temperatures due to diffusion-limited kinetics, as confirmed by power-law response rate analysis and direct diffusion front measurements. Although β-Ta offers a temperature-independent resolution and structural robustness, its slower response time suggests the need for further microstructural optimizations to enhance hydrogen diffusion.
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