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Title: Model for the Prediction of the Hydriding Thermodynamics of Pd-Rh-Co Ternary Alloys

Abstract

A dilute solution model (with respect to the substitutional alloying elements) has been developed, which accurately predicts the hydride formation and decomposition thermodynamics and the storage capacities of dilute ternary Pd-Rh-Co alloys. The effect of varying the rhodium and cobalt compositions on the thermodynamics of hydride formation and decomposition and hydrogen capacity of several palladium-rhodium-cobalt ternary alloys has been investigated using pressure-composition (PC) isotherms. Alloying in the dilute regime (<10 at.%) causes the enthalpy for hydride formation to linearly decrease with increasing alloying content. Cobalt has a stronger effect on the reduction in enthalpy than rhodium for equivalent alloying amounts. Also, cobalt reduces the hydrogen storage capacity with increasing alloying content. The plateau thermodynamics are strongly linked to the lattice parameters of the alloys. A near-linear dependence of the enthalpy of hydride formation on the lattice parameter was observed for both the binary Pd-Rh and Pd-Co alloys, as well as for the ternary Pd-Rh-Co alloys. The Pd-5Rh-3Co (at. %) alloy was found to have similar plateau thermodynamics as a Pd-10Rh alloy, however, this ternary alloy had a diminished hydrogen storage capacity relative to Pd-10Rh.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
758926
Report Number(s):
LA-UR-99-1341
TRN: AH200029%%77
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: TSM '99 Annual Meeting, San Diego, CA (US), 03/01/1999--03/04/1999; Other Information: PBD: 1 Mar 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 08 HYDROGEN; PALLADIUM ALLOYS; RHODIUM ALLOYS; COBALT ALLOYS; TERNARY ALLOY SYSTEMS; HYDRIDATION; THERMODYNAMICS; MATHEMATICAL MODELS; HYDROGEN STORAGE

Citation Formats

Teter, D.F., and Thoma, D.J. Model for the Prediction of the Hydriding Thermodynamics of Pd-Rh-Co Ternary Alloys. United States: N. p., 1999. Web.
Teter, D.F., & Thoma, D.J. Model for the Prediction of the Hydriding Thermodynamics of Pd-Rh-Co Ternary Alloys. United States.
Teter, D.F., and Thoma, D.J. Mon . "Model for the Prediction of the Hydriding Thermodynamics of Pd-Rh-Co Ternary Alloys". United States. https://www.osti.gov/servlets/purl/758926.
@article{osti_758926,
title = {Model for the Prediction of the Hydriding Thermodynamics of Pd-Rh-Co Ternary Alloys},
author = {Teter, D.F. and Thoma, D.J.},
abstractNote = {A dilute solution model (with respect to the substitutional alloying elements) has been developed, which accurately predicts the hydride formation and decomposition thermodynamics and the storage capacities of dilute ternary Pd-Rh-Co alloys. The effect of varying the rhodium and cobalt compositions on the thermodynamics of hydride formation and decomposition and hydrogen capacity of several palladium-rhodium-cobalt ternary alloys has been investigated using pressure-composition (PC) isotherms. Alloying in the dilute regime (<10 at.%) causes the enthalpy for hydride formation to linearly decrease with increasing alloying content. Cobalt has a stronger effect on the reduction in enthalpy than rhodium for equivalent alloying amounts. Also, cobalt reduces the hydrogen storage capacity with increasing alloying content. The plateau thermodynamics are strongly linked to the lattice parameters of the alloys. A near-linear dependence of the enthalpy of hydride formation on the lattice parameter was observed for both the binary Pd-Rh and Pd-Co alloys, as well as for the ternary Pd-Rh-Co alloys. The Pd-5Rh-3Co (at. %) alloy was found to have similar plateau thermodynamics as a Pd-10Rh alloy, however, this ternary alloy had a diminished hydrogen storage capacity relative to Pd-10Rh.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {3}
}

Conference:
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