Journal ArticleDOI
Thermodynamics and kinetics of MgH2-nfTa2O5 composite for reversible hydrogen storage application
Sanjay Kumar,G.P. Tiwari +1 more
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In this article, the thermodynamics and kinetics of hydrogen absorption and desorption of nfTa2O5-Mg-H2 composite have been studied and shown cyclic stability up to fifty hydrogen absorption-desorption without significant changes in the kinetics and hydrogen storage capacity.Abstract:
The thermodynamics and kinetics of hydrogen absorption–desorption of nfTa2O5–Mg–MgH2—composite (nf stands for nano-flakes) have been studied. The nfTa2O5–Mg composite could absorb hydrogen at room temperature (17 °C). The hydrogen desorption of nfTa2O5–MgH2 composite starts at 200 °C. The remarkably improved hydrogen absorption–desorption of catalyzed Mg–MgH2 could be attributed to the nano-engineered surface by nfTa2O5. The enthalpies of hydrogen absorption–desorption were found to be 80 ± 2, and 76 ± 3 kJ/mol respectively.
The activation energy of hydrogen absorption was evaluated as 49 ± 5 kJ/mol which is same as the energy barrier for diffusion of hydrogen in Mg matrix. The apparent activation of hydrogen desorption of nfTa2O5–MgH2 was found to be 74 ± 7 kJ/mol. The nfTa2O5–MgH2 composite has shown cyclic stability up to fifty hydrogen absorption–desorption without significant changes in the kinetics and hydrogen storage capacity.read more
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Recent progress in magnesium hydride modified through catalysis and nanoconfinement
TL;DR: In this paper, the recent progress in catalysis and nanoconfinement effects on the hydrogen storage properties of MgH2 is comprehensively reviewed and the future challenges and prospects of emerging research for Mg H2 are discussed.
Journal ArticleDOI
Improvement of Hydrogen Storage Properties of MgH2 Catalyzed by K2NbF7 and Multiwall Carbon Nanotube
Muhammad Yahya,Mohammad Ismail +1 more
TL;DR: In this article, a study has been conducted on the enhancement of the MgH2 hydrogen storage properties by the 10 wt % of K2NbF7 and 5 wt percent of MWCNT.
Journal ArticleDOI
Enhanced hydrogen storage/sensing of metal hydrides by nanomodification
TL;DR: In this paper, the authors summarized the research process of nanosized metal hydrides and nanoadditives for metal hyddrides in the recent five years and discussed the effect of nanomodification strategy on the improvement of hydrogen storage and sensing properties.
Journal ArticleDOI
Electrospun carbon nanofibers with in-situ encapsulated Ni nanoparticles as catalyst for enhanced hydrogen storage of MgH2
Qiufang Meng,Yuqin Huang,Jikai Ye,Guanglin Xia,Gaofeng Wang,Linxi Dong,Zunxian Yang,Xuebin Yu,Xuebin Yu +8 more
TL;DR: In this article, an electrospinning-based reduction approach is presented to generate nanostructured nickel catalyst, which is protected from irreversible fusion and aggregation in subsequent high-temperature pyrolysis, in carbon nanofibers (Ni@C) in situ.
Journal ArticleDOI
Catalysis and Downsizing in Mg-Based Hydrogen Storage Materials
TL;DR: In this paper, a review of advances in the development of Mg-based hydrogen storage materials related to downsizing and catalysis is presented, in particular, the focus is on how downizing and catalysts affect the hydrogen storage capacity, kinetics and thermodynamics.
References
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Journal ArticleDOI
Materials for hydrogen storage
TL;DR: In this paper, the authors present a review of hydrogen storage on materials with high specific surface area, hydrogen intercalation in metals and complex hydrides, and storage of hydrogen based on metals and water.
Journal ArticleDOI
Hydrogen storage methods
TL;DR: This paper reviews the various storage methods for hydrogen and highlights their potential for improvement and their physical limitations.
Journal ArticleDOI
Fast hydrogen sorption kinetics of nanocrystalline Mg using Nb2O5 as catalyst
TL;DR: In this paper, the efficiency of Nb2O5 as a catalyst for hydrogen sorption reaction of magnesium is investigated, and the results demonstrate that the catalytic effect of the catalysts is superior in absorption as well as desorption.
Journal ArticleDOI
Hydrogen dissociation and diffusion on transition metal (= Ti, Zr, V, Fe, Ru, Co, Rh, Ni, Pd, Cu, Ag)-doped Mg(0001) surfaces
Monica Pozzo,Dario Alfè +1 more
TL;DR: In this article, a density functional theory investigation of H 2 dissociation and subsequent atomic H diffusion on TM (=Ti, V, Zr, Fe, Ru, Co, Rh, Ni, Pd, Cu, Ag, etc.)-doped Mg(0001) surfaces is presented.
Posted Content
Hydrogen Dissociation and Diffusion on Transition Metal(=Ti,Zr,V,Fe,Ru,Co,Rh,Ni,Pd,Cu,Ag)-doped Mg(0001) Surfaces
Monica Pozzo,Dario Alfè +1 more
TL;DR: In this paper, a systematic ab-initio density functional theory investigation of hydrogen dissociation and subsequent atomic H diffusion on TM( =Ti,V,Zr,Fe,Ru,Co,Rh,Ni,Pd,Cu,Ag)-doped Mg(0001) surfaces is presented.