Hydrogen-sorption and thermodynamic characteristics of mechanically grinded TiH1.9 as studied using thermal desorption spectroscopy

Ershova, О.G.; Dobrovolsky, V.D.; Solonin, Yu. М.; Khyzhun, O.Y.

doi:10.1016/j.jallcom.2010.09.003

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…After analyzing the curve obtained by thermal desorption spectroscopy of zirconium alloy (Figure 1a), we established that the optimal step was 100 °C corresponding to 60 A. Analysis of previous works [53][54][55][56][57][58] demonstrated that the first peak of titanium alloy hydrogen desorption is observed at 600 °C. This temperature corresponds to the phase boundary between phases δ and β + δ.…”

Section: Resultsmentioning

confidence: 84%

“…With a linear heating of 6 °C/min, the decrease in intensity of titanium hydride reflections began at 520 °C. At 530 °C, these reflections disappeared almost completely, and hydrogen desorption began Analysis of previous works [53][54][55][56][57][58] demonstrated that the first peak of titanium alloy hydrogen desorption is observed at 600 • C. This temperature corresponds to the phase boundary between phases δ and β + δ. Hence, during this TPD step, dissociation of hydrides occurs.…”

Section: Resultsmentioning

confidence: 97%

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Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Babikhina

Kudiiarov

Mostovshchikov

et al. 2018

Metals

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Currently, standard samples with high hydrogen concentrations that meet the requirements of hydrogen extraction in an inert atmosphere are not currently available on the market. This article describes the preparation of Ti-H standard samples and the calibration of RHEN602, a hydrogen analyzer, using LECO (LECO, Saint Joseph, MI, USA). Samples of technically pure titanium alloy were chosen as the material for sample production. The creation procedure includes five main steps: sample preparation (polishing to an average roughness of 0.04 μm using sandpaper), annealing, hydrogenation, maintenance in an inert gas atmosphere, and characterization of the samples. The absolute hydrogen concentration in the samples was determined by two methods: volumetric and mass change after the introduction of hydrogen. Furthermore, in-situ X-ray diffraction, temperature programmed desorption (TPD) analysis, and thermogravimetric analysis were used during measurements to investigate the phase transitions in the samples. As a result of this work, a series of calibration samples were prepared in a concentration range up to 4 wt % hydrogen, optimal parameters for measuring high concentrations of hydrogen. The calibration line was obtained and the calibration error was 10%.

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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 97%

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Babikhina

Kudiiarov

Mostovshchikov

et al. 2018

Metals

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show abstract

“…The system consists of two connected metal hydride (MH) beds: a high-temperature (HT) bed operating at ≥650 °C and a low temperature (LT) bed operating near ambient temperature (~40 °C). When heat is added to the HT-reservoir, such as by solar energy, H2 is released in an endothermic reaction that absorbs ~150 kJ per mol H2 [10][11][12]. The hydrogen moves to the LT-reservoir, where it forms a hydride at near ambient temperature and releases ~25-35 kJ/mol H2 of heat to the environment.…”

Section: Operating Principle Of Dual Bed Metal Hydride Thermochemicalmentioning

confidence: 99%

Metal Hydrides for High-Temperature Power Generation

et al. 2015

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Metal hydrides can be utilized for hydrogen storage and for thermal energy storage (TES) applications. By using TES with solar technologies, heat can be stored from sun energy to be used later, which enables continuous power generation. We are developing a TES technology based on a dual-bed metal hydride system, which has a high-temperature (HT) metal hydride operating reversibly at 600-800 °C to generate heat, as well as a low-temperature (LT) hydride near room temperature that is used for hydrogen storage during sun hours until there is the need to produce electricity, such as during night time, a cloudy day or during peak hours. We proceeded from selecting a high-energy density HT-hydride based on performance characterization on gram-sized samples scaled up to kilogram quantities with retained performance. COMSOL Multiphysics was used to make performance predictions for cylindrical hydride beds with varying diameters and thermal conductivities. Based on experimental and modeling results, a ~200-kWh/m 3 bench-scale prototype was designed and fabricated, and we demonstrated the ability to meet or exceed all performance targets. OPEN ACCESSEnergies 2015, 8 8407

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“…or by grinding a metal Mg powder with the indicated additives in a hydrogen atmosphere (that is, reactive grinding) or in an inert gas atmosphere followed by its direct hydrogenation from the gas phase . One of the ways to reduce the thermodynamic stability of MgH2 is to use mechanical alloys, which are solid solutions in magnesium of one or several metals, which can reduce the enthalpy of formation / decomposition of Mg (Me) H2 [32][33][34][35][36][37][38][39][40][41][42]. According to the theoretical forecast [4], the hydride of a solid solution of Al, Ti, Fe, Ni, Cu, Nb in Mg should have a lower enthalpy of formation and decompose at a lower temperature compared to pure MgH2.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Sorption Properties, Thermal Stability and Kinetics of Hydrogen Desorption From the Hydride Phase of The MgH2 of a Mechanical Alloys of Magnesium with Ti, Ni and Y

Ershova

Dobrovolsky

Solonin

2020

PCSS

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The mechanical alloys-composite MАs (Mg +10 % wt.Ti + 5 % wt.Y and Mg +10 % wt.Ni + 5 % wt.Y) were synthesized. The phase content, microstructure, the thermal stability, kinetics of hydrogen desorption from the MgH2 hydride phase of the obtained MAs were studiedby using XRD, SEM, TDS methods. It has been established that the addition of Ti + Y and Ni + Y to magnesium leads to significant improvement in the kinetics of hydrogen desorption from the MgH2 hydride phase, which is evidenced by a significant reduction (in 6 and 15 times)in the time of release of all hydrogen from MA1 and MA2, respectively. Due to, Ti, Ni,Y alloying, the decrease in the thermodynamic stability of MgH2 is not found.

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Hydrogen-sorption and thermodynamic characteristics of mechanically grinded TiH1.9 as studied using thermal desorption spectroscopy

Cited by 10 publications

References 24 publications

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

Metal Hydrides for High-Temperature Power Generation

Hydrogen Sorption Properties, Thermal Stability and Kinetics of Hydrogen Desorption From the Hydride Phase of The MgH2 of a Mechanical Alloys of Magnesium with Ti, Ni and Y

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