Thermodynamic properties and the degradation of ZrNiHx at elevated temperatures

Cantrell, J. S.; Bowman, Robert C.; Wade, L. A.; Luo, S.; Clewley, J.D.; Flanagan, Ted B.

doi:10.1016/0925-8388(95)01861-1

Cited by 28 publications

(27 citation statements)

References 18 publications

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“…Based upon past degradation studies of the ZrNiH x system [30,31], it is expected that disproportionation would lead to the increase of the OFF-state pressure and changes in the slopes of the GGA characterization curves. During the actuator cycling hydrogen pressure, electrical power supplied to the actuator, temperature of the test unit and of the cooled reference were constantly monitored.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the degraded alloy system will not be able to re-absorb the initial amount of hydrogen. Some investigators [31] observed also traces of zirconium oxide in the analysis of the cycled material that may have also contributed to the hydrogen capacity deterioration. A comprehensive explanation of the degradation phenomenon in the ZrNiH x system was not given in these studies.…”

Section: Introductionmentioning

confidence: 95%

“…It has been previously observed [30,31] that degradation of the ZrNiH x system occurs at elevated temperatures (i.e. T > 675-700 K) jeopardizing its usefulness for applications requiring simultaneous large hydrogen concentration and high-temperature.…”

Section: Introductionmentioning

confidence: 98%

“…The degradation products were more stable binary hydride compounds (i.e. zirconium hydride phases ZrH ∼2 ) while nickel was separated either as a pure nickel phase [31] or as ZrNi 3 [30]. This precipitation and phase segregation process, commonly called disproportionation, changes the properties of the hydrogen-metal system and also causes a decrease in the reversible hydrogen capacity.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

Prina

Bowman

Kulleck

2004

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

Prina

Bowman

Kulleck

2004

Journal of Alloys and Compounds

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“…On the one hand, for ZrNi, Cantrell et al [34] have shown that this compound absorbs hydrogen to form ZrNiH and ZrNiH 3 hydrides through a large plateau pressure in PCI curves such as in (Ti,Zr)Ni substituted compounds. Moreover, theoretical calculations on the electronic structure of ZrNiH hydride performed by Gupta [35] shows that hydrogen atoms mostly interact with Zr than with Ni atoms.…”

Section: Discussionmentioning

confidence: 98%

Hydrogenation properties of shape memory Ti(Ni,Pd) compounds

Emami

Cuevas

2011

Intermetallics

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Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH ₃

Rkhis¹,

Alaoui‐Belghiti²,

Laasri³

et al. 2020

Int J Energy Res

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Summary The effect of Zr substitution by alkaline earth metals Mg, Be and post‐transition metal Al on the evolution of hydrogen storage properties of ZrNiH3 has been investigated by ab‐initio calculations based on density functional theory. The stability of the quaternary hydrides is studied by the determination of the formation enthalpy and the desorption temperature. The obtained results indicate a reduction of the formation enthalpy as well as the desorption temperature, hence reflecting the enhancement of hydrogen storage properties of ZrNiH3. Interestingly, each dopant (Mg, Be and Al) achieved its optimum substitution effect at a particular concentration, with Al and Be elements are found to exhibit the lowest substituting content ~17% and ~23% respectively and Mg with the highest concentration ~85%, to achieve an ideal formation enthalpy (ΔH = −40 kJ/mol.H2) and desorption temperatures (289 to 393 K), as required for practical use of proton exchange membrane fuel cells (PEMFC) without affecting the hydrogen storage capacity as seen in pure ZrNiH3.Moreover, the electronic structure investigated by partial density of states (PDOS), reveals the metallic nature of Zr1−xAMxNiH3 (AM = Mg, Be and Al) hydrides. Highlights The ZrNiH3 hydride presents high stability and high decomposition temperature. The stability decreases significantly when doping ZrNiH3 with Mg, Be and Al. The density of states reveals the metallic nature of Zr1−xAMxNiH3 hydrides.

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Thermodynamic properties and the degradation of ZrNiHx at elevated temperatures

Cited by 28 publications

References 18 publications

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

Hydrogenation properties of shape memory Ti(Ni,Pd) compounds

Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH ₃

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Thermodynamic properties and the degradation of ZrNiHx at elevated temperatures

Cited by 28 publications

References 18 publications

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

Hydrogenation properties of shape memory Ti(Ni,Pd) compounds

Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH 3

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Product

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Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH ₃