NDLI: Hydrogen Solubility in Pd/V$_{2}$O$_{5}$ Composites Formed by Internal Oxidization and Hydrogen Isotherms in Un-oxidized Pd-V Alloys

Content Provider	Springer Nature Link
Author	Flanagan, Ted B. Wang, D. Luo, S.
Copyright Year	2013
Abstract	Pd-V alloys were internally oxidized (IOed) resulting in composites of nano-particle V$_{2}$O$_{5}$ precipitates within Pd matrices. These composites were found to interact with H$_{2}$ to form hydrogen bronzes, H$_{ x }$V$_{2}$O$_{5}$, within the Pd matrix where x can vary between 1.65 and 2.20. Relative partial molar enthalpies for H intercalation into the H-bronze within the Pd/V$_{2}$O$_{5}$ composite were measured calorimetrically as a function of the H content of the bronze, and these molar enthalpies decrease in magnitude from about −75 to −20 kJ/mol H as the H content increases. H$_{2}$ isotherms have also been measured in disordered, fcc Pd$_{0.96}$V$_{0.04}$, Pd$_{0.945}$V$_{0.055}$, and Pd$_{0.93}$V$_{0.07}$ alloys from 273 K to 343 K (0 °C to 70 °C). Thermodynamic data have been derived from these isotherms. The relative partial molar enthalpies at infinite dilution of H, $$Δ H_{\hbox{H}}^\circ,$$ increase with atom fraction V, X $$_{\hbox{V}},$$ while the corresponding standard partial molar entropies, $$Δ \hbox{S}_{\hbox{H}}^\circ,$$ decrease with $$\hbox{X}_{\hbox{V}}.$$ The first-order term, g$_{1}$, in a polynomial expansion of the excess or non-ideal chemical potential of H in r = H-to-metal, mol ratio, decreases in magnitude with $$\hbox{X}_{\hbox{V}}$$ at a given temperature.
Starting Page	2810
Ending Page	2818
Page Count	9
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	44
Issue Number	6
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2013-02-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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