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Hydrogenation Thermodynamics of Ti16V60Cr24−xFex Alloys (x = 0, 4, 8, 12, 16, 20, 24)

Ravalison, Francia ; Huot, Jacques

Hydrogen, 2024-03, Vol.5 (1), p.29-38 [Periódico revisado por pares]

Hamburg: MDPI AG

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Título:
Hydrogenation Thermodynamics of Ti16V60Cr24−xFex Alloys (x = 0, 4, 8, 12, 16, 20, 24)
Autor: Ravalison, Francia ; Huot, Jacques
Assuntos: Alloys ; BCC alloys ; Chromium ; Confidence intervals ; Crystal structure ; Enthalpy ; Entropy ; Factor analysis ; High temperature ; Hydrogen ; hydrogen storage ; Hydrogenation ; Intermetallic compounds ; Investigations ; Phase transitions ; Porous materials ; pressure composition isotherm enthalpy ; Solid solutions ; Statistical analysis ; Thermodynamics ; vanadium-rich alloy
É parte de: Hydrogen, 2024-03, Vol.5 (1), p.29-38
Descrição: The effect of the partial substitution of Cr with Fe on the thermodynamic parameters of vanadium-rich Ti16V60Cr24-xFex alloys (x = 0, 4, 8, 12, 16, 20, 24) was investigated. For each composition, a pressure–concentration isotherm (PCI) was registered at 298, 308, and 323 K. The PCI curves revealed a reduction in plateau pressure and a decrease in desorbed hydrogen capacity with an increasing amount of Fe. For all alloys, about 50% or less of the initial hydrogen capacity was desorbed for all chosen temperatures. Entropy (ΔS) and enthalpy (ΔH) values were deducted from corresponding Van’t Hoff plots of the PCI curves: the entropy values ranged from −150 to −57 J/K·mol H2, while the enthalpy values ranged from −44 to −21 kJ/mol H2. They both decreased with an increasing amount of Fe. Plotting ΔS as function of ΔH showed a linear variation that seems to indicate an enthalpy–entropy compensation. Moreover, a quality factor analysis demonstrated that the present relationship between entropy and enthalpy is not of a statistical origin at the 99% confidence level.
Editor: Hamburg: MDPI AG
Idioma: Inglês

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Hydrogenation Thermodynamics of Ti16V60Cr24−xFex Alloys (x = 0, 4, 8, 12, 16, 20, 24)

Ravalison, Francia ; Huot, Jacques

Hamburg: MDPI AG

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