The effect of particle size and surface composition on the reaction rates of some hydrogen storage alloys

Murray, J.; Miller, Hagit; Bird, Paul G.; Goudy, A.J.

doi:10.1016/0925-8388(95)01769-0

Cited by 17 publications

(1 citation statement)

References 10 publications

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“…As well, the activation process could foster the formation of Ni metal clusters on the surface. Prior studies of these and similar systems have concluded that such Ni metal particulates form on the surface and serve as hydrogen dissocation sites during the hydrogen absorption process, although whether these clusters are oxidized or not seems to be a function of pretreatment [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Reversible and irreversible passivation of a La–Ni–Al alloy

Shanahan

Klein

2010

Journal of Alloys and Compounds

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This paper seeks to explore some of the effects of passivating a LaNi 4.25 Al 0.75 sample by air oxidation under controlled conditions. Passivation of this metal hydride alloy seems to have two distinct regimes. The first occurs with air oxidation at 80 o C and 20 o C. It is characterized by complete reversibility upon hydrogen readsorption, although said readsorption is hindered substantially at room temperature, requiring the material to be heated to produce the reactivation. The second regime is illustrated by 130 o C air oxidation and is characterized by irreversible loss of hydrogen absorption capacity. This passivation does not hinder hydrogen readsorption into the remaining hydride material.

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Section: Introductionmentioning

confidence: 99%

Reversible and irreversible passivation of a La–Ni–Al alloy

Shanahan

Klein

2010

Journal of Alloys and Compounds

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Design and analysis of metal hydride reactor embedded with internal copper fins and external water cooling

Gupta

Sharma

2020

Int J Energy Res

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Summary Hydrogen is considered as a viable alternative fuel source for many domains. The main challenge in hydrogen technology is its storage. The most efficient form of storing hydrogen by volume is to adopt solid‐state storage. This is achieved by gas‐solid interaction using metal hydrides (MH). But, to achieve the full storing potential of MH, the heat management of the reactor is the critical factor. MHs having inferior thermal conductivity prove a challenge and thus, several kinds of research have gone into developing efficient MH reactors with features trying to enhance the heat transfer rate. In the view of this, in the present work, an MH reactor is designed and numerically (finite volume method) analyzed its heat transfer characteristics during hydrogenation and dehydrogenation of La0.9Ce0.1Ni5 at 293 K. Besides, to achieve improved heat transfer rates, new internal copper fins, and external water jackets are provided. The objective of the present work is to achieve high heat transfer rates with minimum reduction in MH mass within the reactor. Also, a parametric study is carried out to identify the optimized fin design by varying number fins, fin height, and fin thickness, which results in the optimum fin structure of 12 numbers, 12 mm, and 2 mm, respectively. The CFD simulation of MH reactor with and without fins results in improved heat transfer rates and reaction kinetics with internal copper fins. The maximum temperature rise during absorption is reduced by 22.3 K, and during desorption, the drop in bed temperature is reduced by 6.8 K, using optimized copper fins. The obtained results are compared with previous work and observed that the implementation of internal copper fins with external water cooling provides better heat transfer. The proposed reactor + fin arrangement can be efficiently used for the development of MH based thermodynamic devices.

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Photodynamic and Its Concomitant Ion‐Interference Synergistic Therapies Based on Functional Hierarchically Mesoporous MOFs

Yang

et al. 2022

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peroxide, the decrease of superoxide dismutase (SOD) activity as well as the enhancement of reactive oxygen species (ROS) production, and finally cell apoptosis. [3] Meanwhile, as basic components in human metabolism, PAs take the advantages of high biocompatibility and low systemic toxicity. [4] Unfortunately, the direct adoption of PAs (e.g., phosphate compounds) for in vivo therapies is usually prohibited by their high therapeutic dosage, short internal circulation, and nonselective cytotoxicity. [5] Thus, it is of great significance to explore an ideal PAs donor to tackle these issues.Despite that black phosphorus quantum dots (BPQDs) have been extensively applied in cancer treatment thanks to their unique biocompatibility and photothermal effects, the exploration of their potential as ions donor is still in infancy. [6] Under the stimulation of oxidative stress, ultra-small BPQDs could be degraded spontaneously to release PAs, realizing their efficient conversion from NPs to ions. [7] However, since the endogenous oxidative stimuli often vary with cell types and physical distribution, the conversion of BPQDs into ions in the intracellular environment is generally slow and uncontrollable, finally impairing their therapeutic efficacy. Therefore, it is necessary to screen a suitable exogenous stimulus to achieve controllable degradation of BPQDs. It is well documented that photodynamic therapy (PDT), by combining photosensitizers (PSs) and light, could produce ROS on demand. [8] This inspires us to integrate PSs and BPQDs into one entity to achieve lighttriggered PDT and its concomitant synergistic IIT.Metal-organic frameworks (MOFs) are regarded as one of the promising drug delivery platforms thanks to their tailorable pore sizes, high surface areas, and multi-functional frameworks. [9] Interestingly, by coupling the Hofmeister effect with the structure directing agent of triblock copolymers, hierarchically mesoporous MOFs (HMMOFs) were recently reported, which not only inherited the merits of traditional MOFs, but also contained continuous and accessible large mesopores. [10] Although such large mesopores are generally competent for the adsorption of bulky molecules such as enzymes (soft NPs with diameter of several nanometers), the related works about the immobilization of hard NPs (e.g., quantum dots) within Although ion-interference therapy (IIT) has become an intriguing option for cancer treatment, the generation of interference ions on-demand remains a challenge. Herein, a nanoplatform based on hierarchically mesoporous metal-organic frameworks (HMMOFs) is adopted to integrate black phosphorus quantum dots (BPQDs) and meso-tetra(4-carboxyphenyl) porphine (TCPP) to realize controllable phosphate anions (PAs) production in a specific cancerous region for IIT. The uniform large mesopores of HMMOFs could guarantee the selective screening and immobilization of ultra-small and monodispersed BPQDs. The TCPP in microporous domains of HMMOFs could effectively produce 1 O 2 , which not only serves as photose...

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The effect of particle size and surface composition on the reaction rates of some hydrogen storage alloys

Cited by 17 publications

References 10 publications

Reversible and irreversible passivation of a La–Ni–Al alloy

Reversible and irreversible passivation of a La–Ni–Al alloy

Design and analysis of metal hydride reactor embedded with internal copper fins and external water cooling

Photodynamic and Its Concomitant Ion‐Interference Synergistic Therapies Based on Functional Hierarchically Mesoporous MOFs

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