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Investigation on LiBH₄-CaH₂ composite and its potential for thermal energy storage.

ABSTRACT: The LiBH₄/CaH₂ composite are firstly studied as Concentrating Solar Power Thermal Storage Material. The LiBH₄/CaH₂ composite according to the stoichiometric ratio are synthesized by high-energy ball milling method. The kinetics, thermodynamics and cycling stability of LiBH₄/CaH₂ composite are investigated by XRD (X-ray diffraction), DSC (Differential scanning calorimeter) and TEM (Transmission electron microscope). The reaction enthalpy of LiBH₄/CaH₂ composite is almost 60?kJ/mol H₂ and equilibrium pressure is 0.482?MPa at 450?°C. The thermal storage density of LiBH₄/CaH₂ composite is 3504.6?kJ/kg. XRD results show that the main phase after dehydrogenation is LiH and CaB₆. The existence of TiCl₃ and NbF₅ can effectively enhance the cycling perfomance of LiBH₄/CaH₂ composite, with 6-7?wt% hydrogen capacity after 10?cycles. The high thermal storage density, high working temperature and low equilibrium pressure make LiBH₄/CaH₂ composite a potential thermal storage material.

SUBMITTER: Li Y

PROVIDER: S-EPMC5282489 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature

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Investigation on LiBH4-CaH2 composite and its potential for thermal energy storage.

Li Yang Y Li Ping P Qu Xuanhui X

Scientific reports 20170131

The LiBH4/CaH2 composite are firstly studied as Concentrating Solar Power Thermal Storage Material. The LiBH4/CaH2 composite according to the stoichiometric ratio are synthesized by high-energy ball milling method. The kinetics, thermodynamics and cycling stability of LiBH4/CaH2 composite are investigated by XRD (X-ray diffraction), DSC (Differential scanning calorimeter) and TEM (Transmission electron microscope). The reaction en ...[more]

PMID: 28139740

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Project description:A simple hydrothermal route assisted by a triblock copolymer was used to synthesize Ag2O/Ag nanoparticles on a robotic support consists of functionalized MWCNTs and graphene composite (Ag2O/Ag/CNT-graphene). The composites together with the individual analog of Ag/CNT and Ag/graphene were characterized by means of XRD, TEM-SAED, N2 sorptiometry, Raman, FTIR, UV-Vis, and photoluminescence spectroscopy. These nanomaterials were then tested for the catalytic reduction of 4-nitrophenol (4-NP) to the technologically beneficial 4-aminophenol (4-AP). The Ag2O@Ag@CNT-graphene composite calcined at 400°C has shown fascinating reduction performances for 4-NP either in the dark (k = 0.014 s-1) or under visible light illumination (k = 0.039 s-1) in the presence of 5 mM NaBH4 compared to Ag/CNT (0.0112 s-1) and Ag/graphene (0.010 s-1) catalysts. This was chiefly because Ag2O@Ag@CNT-graphene comprises the highest pore volume (0.49 cm3/g) and involves three types of pores in the margin from 1.8 to 4.0 nm in front of only one modal type of pores for the rest of the catalysts and thus maximizes the adsorptive capacity of the reactants (4-NP and NaBH4). Moreover, the former composite exhibits the highest concentration of the Ag2O component as established by numerous techniques in addition to the cyclic voltammetry, proposing it's facile reaction with 4-NP along with the simultaneous transfer of surface hydrogen and electrons from NaBH4 ions to produce 4-AP. The promotion of the p-n junction evaluated using the Mott-schottky equation on Ag2O@Ag@CNT-graphene assisted by charges separation and surface plasmon resonance bands of Ag and Ag2O are found to be advantageous for 4-NP reduction. The latter composite delivers a specific capacitance of 355 F g-1 at 1.0 A g-1 exceeding those of Ag/CNT (230 F g-1) and Ag/graphene (185 F g-1). The EIS study establishes the high electronic conductivity of the metallic Ag and Ag2O moieties, low internal resistance of CNT-graphene as well as the marked ionic transfer facilitated by the composite porous nature.

Dataset Information

Investigation on LiBH₄-CaH₂ composite and its potential for thermal energy storage.

Publications

Investigation on LiBH<sub>4</sub>-CaH<sub>2</sub> composite and its potential for thermal energy storage.

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