Experimental investigation and thermodynamic calculation of Ti-Hf-Mn system

Hu, Te; Huang, Xiaozhong; Li, J.H.; Zhang, J.; Cai, Gemei; Jin, Zhanpeng

doi:10.1016/j.calphad.2020.101776

Cited by 4 publications

(2 citation statements)

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“…The XRD analyses indicate that TiMn 1.52 alloy exhibits a disordered structure and C14-type Laves phase without any second phase. C14-type Laves phase of the same alloy was previously reported by Dekhtyarenko et al [ 19 ] and Hu et al [ 8 ]. The most interesting feature about C14-type Laves hydrogen storage materials is that they have favourable hydrogen absorption/desorption kinetics, exhibiting easy penetration of hydrogen atoms [ 20 ].…”

Section: Resultssupporting

confidence: 78%

“…Regardless of these superior properties, deterioration of hydrogen charging performances resulting from the surface chemical action of poisonous electrophilic gases is still a concern and therefore activation prior to hydrogen absorption is required [ 1 , 7 ]. Some well-known attempts to improve hydrogenation behaviour of these binary alloys include element substitution, structural change, and multicomponent strategies [ 6 , 8 ]. An example of element substitution includes a study by Liu et al [ 1 ], where Ti and Zr comprised the A site, while Mn, Cr, V, Ni, Fe, and Cu metals occupied the B site to produce a (Ti 0.85 Zr 0.15 ) 1.05 Mn 1.2 Cr 0.6 V 0.1 M 0.1 alloy (where M=Ni, Fe, Cu).…”

Section: Introductionmentioning

confidence: 99%

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Improved Hydrogenation Kinetics of TiMn1.52 Alloy Coated with Palladium through Electroless Deposition

et al. 2021

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The deterioration of hydrogen charging performances resulting from the surface chemical action of electrophilic gases such as CO2 is one of the prevailing drawbacks of TiMn1.52 materials. In this study, we report the effect of autocatalytic Pd deposition on the morphology, structure, and hydrogenation kinetics of TiMn1.52 alloy. Both the uncoated and Pd-coated materials were characterized using scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) and X-ray diffraction (XRD). XRD analyses indicated that TiMn1.52 alloy contains C14-type Laves phase without any second phase, while the SEM images, together with a particle size distribution histogram, showed a smooth non-porous surface with irregular-shaped particles ranging in size from 1 to 8 µm. The XRD pattern of Pd-coated alloy revealed that C14-type Laves phase was still maintained upon Pd deposition. This was further supported by calculated crystallite size of 29 nm for both materials. Furthermore, a Sieverts-type apparatus was used to study the kinetics of the alloys after pre-exposure to air and upon vacuum heating at 300 °C. The Pd-coated AB2 alloy exhibited good coating quality as confirmed by EDS with enhanced hydrogen absorption kinetics, even without activation. This is attributed to improved surface tolerance and a hydrogen spillover mechanism, facilitated by Pd nanoparticles. Vacuum heating at 300 °C resulted in removal of surface barriers and showed improved hydrogen absorption performances for both coated and uncoated alloys.

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Section: Resultssupporting

confidence: 78%