Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24)
The effect of the partial substitution of Cr with Fe on the thermodynamic parameters of vanadium-rich Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24-x</sub>Fe<sub>x</sub> alloys (x = 0, 4, 8, 12, 16, 20, 24) was investigated. For each composition, a pressure–c...
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| Format: | Article |
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MDPI AG
2024-01-01
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| Series: | Hydrogen |
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| Online Access: | https://www.mdpi.com/2673-4141/5/1/3 |
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| author | Francia Ravalison Jacques Huot |
| author_facet | Francia Ravalison Jacques Huot |
| author_sort | Francia Ravalison |
| collection | DOAJ |
| description | The effect of the partial substitution of Cr with Fe on the thermodynamic parameters of vanadium-rich Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24-x</sub>Fe<sub>x</sub> 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 H<sub>2</sub>, while the enthalpy values ranged from −44 to −21 kJ/mol H<sub>2</sub>. 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. |
| first_indexed | 2024-04-24T18:12:14Z |
| format | Article |
| id | doaj.art-43cc1e87f38040d7a3ee7e8525512f2f |
| institution | Directory Open Access Journal |
| issn | 2673-4141 |
| language | English |
| last_indexed | 2024-04-24T18:12:14Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Hydrogen |
| spelling | doaj.art-43cc1e87f38040d7a3ee7e8525512f2f2024-03-27T13:44:37ZengMDPI AGHydrogen2673-41412024-01-0151293810.3390/hydrogen5010003Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24)Francia Ravalison0Jacques Huot1Hydrogen Research Institute, Université du Québec à Trois-Rivières, Trois-Rivières, QC G9A5H7, CanadaHydrogen Research Institute, Université du Québec à Trois-Rivières, Trois-Rivières, QC G9A5H7, CanadaThe effect of the partial substitution of Cr with Fe on the thermodynamic parameters of vanadium-rich Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24-x</sub>Fe<sub>x</sub> 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 H<sub>2</sub>, while the enthalpy values ranged from −44 to −21 kJ/mol H<sub>2</sub>. 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.https://www.mdpi.com/2673-4141/5/1/3hydrogen storagevanadium-rich alloyBCC alloysthermodynamicspressure composition isotherm enthalpyentropy |
| spellingShingle | Francia Ravalison Jacques Huot Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24) Hydrogen hydrogen storage vanadium-rich alloy BCC alloys thermodynamics pressure composition isotherm enthalpy entropy |
| title | Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24) |
| title_full | Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24) |
| title_fullStr | Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24) |
| title_full_unstemmed | Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24) |
| title_short | Hydrogenation Thermodynamics of Ti<sub>16</sub>V<sub>60</sub>Cr<sub>24−x</sub>Fe<sub>x</sub> Alloys (x = 0, 4, 8, 12, 16, 20, 24) |
| title_sort | hydrogenation thermodynamics of ti sub 16 sub v sub 60 sub cr sub 24 x sub fe sub x sub alloys x 0 4 8 12 16 20 24 |
| topic | hydrogen storage vanadium-rich alloy BCC alloys thermodynamics pressure composition isotherm enthalpy entropy |
| url | https://www.mdpi.com/2673-4141/5/1/3 |
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