Influence of aminosilane surface functionalization of rare earth hydride-forming alloys on palladium treatment by electroless deposition and hydrogen sorption kinetics of composite materials

Williams, M.; Nechaev, Alexander; Lototsky, M.V.; Yartys, V.A.; Solberg, Jan Ketil; Denys, R.V.; Pineda, C.A.; Li, Q.; Linkov, Vladimir

doi:10.1016/j.matchemphys.2008.11.049

Cited by 31 publications

(23 citation statements)

References 20 publications

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“…Further detailed data on the characterization of the intermetallide substrate have been presented elsewhere [7,[9][10][11].…”

Section: Methodsmentioning

confidence: 99%

“…Our earlier studies [7][8][9][10][11][12] showed that the electroless plating of palladium facilitates an enhancement of the hydrogenation kinetics in the AB 5 -type intermetallics under mild conditions and without prior activation of the material by vacuum heating. Two challenging problems should be addressed prior to further implementation of this technique to improve activation performances and poisoning tolerance of the AB 5 -type intermetallics.…”

Section: Introductionmentioning

confidence: 99%

“…Second, to further enhance the kinetics of hydrogenation it is necessary to increase the density of Pd coating which, under conventional plating conditions, has a discontinuous nature. Both shortcomings originated from the low specific surface area of the starting substrate material ($0.05 m 2 g À1 ) [11]. Thus, it is necessary to implement procedures to increase the specific surface area of the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that surface (hydr)oxides have the capacity to assist the surface bonding of aminosilane layers, which were found to immobilize large quantities of Pd nuclei in electroless plating, thereby facilitating the deposition of continuous Pd layers. Using the surface functionalization step in the electroless plating of Pd, intermetallides demonstrating increased Pd surface density have been prepared, and continuous Pd layers have been observed on the surface of the substrate particles [11]. As a result of the large increase in the Pd concentration on the surface of the intermetallide, materials demonstrating a seven-fold increase in the kinetics of hydrogenation have been produced, as compared with that prepared without the functionalization step [8].…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured surface coatings for the improvement of AB₅-type hydrogen storage intermetallics

Williams

Lototsky

Linkov

et al. 2009

Int. J. Energy Res.

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SUMMARYHydrogen absorption behaviour of intermetallic absorbers strongly depends upon the contribution of the surface layers into the overall rate of the hydrogenation process. Activation process, which is normally required to initiate and facilitate the initial hydrogen uptake, may be waved by modifying the surface behaviour, thus offering obvious practical benefits. In the present work a surface nanoengineering approach was developed to enhance the hydrogenation ability of rare earth-containing AB 5 -type hydride-forming intermetallics. The modification involves three successive steps; (a) fluorination to form a surface-covering REF 3 layer with a high specific surface area; (b) surface functionalization by g-APTES; (c) deposition of Pd nanoparticles into the surface nanocavities of the fluoride. The surface functionalization step was applied to immobilize Pd nuclei inside the nanocavities of the REF 3 layer. The deposited Pd nanoparticles exhibited a high degree of coalescence, and were further transformed into a continuous surface layer. Pd/fluoride modified materials exhibited exceptional Pd coating densities and imposed a large facilitation in the kinetics of hydrogenation compared with the conventional nonmodified intermetallics. The approach has a potential in the directed design of new classes of highly efficient and robust composite hydrogen sorption materials for hydrogen storage, separation and purification. Large improvements in the kinetics of hydrogenation of the Pd/fluoride modified intermetallics also manifested by extraordinary surface poisoning tolerance towards oxygen and water vapour, as compared with that of the nonmodified, or just fluorinated/Pd modified intermetallic alloys. The developed classes of highly efficient and robust composite hydrogen sorption materials have the potential for application as sorption media for the high efficiency hydrogen storage, separation and purification systems and may facilitate progress towards the implementation of the key elements of future hydrogen economy.

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“…Further detailed data on the characterization of the intermetallide substrate have been presented elsewhere [7,[9][10][11].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanostructured surface coatings for the improvement of AB₅-type hydrogen storage intermetallics

Williams

Lototsky

Linkov

et al. 2009

Int. J. Energy Res.

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“…The corresponding surface modification procedures for the preparation of the advanced materials were developed [29,30], and feasibility of their application for hydrogen purification from (CO 2 þ CO)-containing gases was demonstrated [31,32]. The novel features of the developed surface modification procedures include (i) enhancement of PGM deposition by surface functionalisation of the metallic hydride-forming material [25,28,29], and (ii) combination of fluorination and enhanced PGM deposition procedures [24,28,30].…”

Section: Introductionmentioning

confidence: 99%

Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures

Modibane

Williams

Lototskyy

et al. 2013

International Journal of Hydrogen Energy

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Modibane, K.D. et al. (2013). Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures. AbstractMetal hydride materials offer attractive solutions in addressing problems associated with hydrogen separation and purification from waste flue gases. However, a challenging problem is the deterioration of hydrogen charging performances resulting from the surface chemical action of electrophilic gases. In this work, the feasibility study of poisoning tolerance of surface modified AB5-type hydride forming materials and their application for hydrogen separation from process gases containing carbon dioxide and monoxide was carried out. Target composition of La(Ni,Co,Mn,Al)5 substrate was chosen to provide maximum reversible hydrogen capacity at the process conditions. The selected substrate alloy has been shown to be effectively surface-modified by fluorination followed by electroless deposition of palladium. The surface-modified material exhibited good coating quality, high cycle stability and minimal deterioration of kinetics of selective hydrogen absorption at room temperature, from gas mixtures containing 10% CO2 and up to 100 ppm CO. The experimental prototype of a hydrogen separation unit, based on the surfacemodified metal hydride material, was tested and exhibited stable hydrogen separation and purification performances when exposed to feedstocks containing concentrations of CO21. Introduction Metal hydride (MH) materials have found a number of promising gas-phase applications in processes of considerable economic potential, such as hydrogen storage, separation and recovery, thermally-driven compressors and heat pumps, etc. [1e3]. These materials exhibit a favourable combination of their properties, including reversibility and selectivity of interaction with H 2 gas at mild conditions, high volumetric density of hydrogen in the solid, significant heat effects in the course of hydrogenation/dehydrogenation. Thus they are very flexible in the applications, and often allow to develop multifunctional facilities (e.g., for hydrogen storage, purification and controlled supply) which offer to an end-user safe, efficient and cost-saving solutions [4].

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Electroless nickel deposition of a palladium‐activated self‐assembled monolayer on polyester fabric

Guo

Jiang

Zheng

et al. 2012

J of Applied Polymer Sci

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In this study, an alternative Pd activation process was developed for electroless Ni plating on polyester fabric modified with a self‐assembled monolayer (SAM) of 3‐aminopropyltrimethoxysilane (APTMS). The presence of a highly oriented amino‐terminated SAM and the formation of Pd‐activated APTMS were demonstrated by X‐ray photoelectron spectroscopy analysis. After activation, electroless Ni plating was successfully initiated, and the Ni coating was deposited onto the surface of the polyester fibers. The resulting Ni coating was examined by scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and X‐ray diffraction. The electromagnetic interference (EMI) shielding effectiveness (SE) and adhesive strength of the Ni‐plated polyester fabric were evaluated. On the basis of the experimental results, the Ni coating produced with a Pd‐activated SAM was uniform and dense. As the Ni weight on the treated fabric was 32 g/m2, the EMI SE of the Ni‐plated polyester fabric modified with APTMS obtained was more than 30 dB at frequencies that ranged from 2 to 18 GHz. Compared with the conventional two‐step activation method, Ni coating on the Pd‐activated polyester fabric modified with APTMS improved the coating adherence stability. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Influence of aminosilane surface functionalization of rare earth hydride-forming alloys on palladium treatment by electroless deposition and hydrogen sorption kinetics of composite materials

Cited by 31 publications

References 20 publications

Nanostructured surface coatings for the improvement of AB₅-type hydrogen storage intermetallics

Nanostructured surface coatings for the improvement of AB₅-type hydrogen storage intermetallics

Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures

Electroless nickel deposition of a palladium‐activated self‐assembled monolayer on polyester fabric

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Influence of aminosilane surface functionalization of rare earth hydride-forming alloys on palladium treatment by electroless deposition and hydrogen sorption kinetics of composite materials

Cited by 31 publications

References 20 publications

Nanostructured surface coatings for the improvement of AB5-type hydrogen storage intermetallics

Nanostructured surface coatings for the improvement of AB5-type hydrogen storage intermetallics

Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures

Electroless nickel deposition of a palladium‐activated self‐assembled monolayer on polyester fabric

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Product

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Nanostructured surface coatings for the improvement of AB₅-type hydrogen storage intermetallics

Nanostructured surface coatings for the improvement of AB₅-type hydrogen storage intermetallics