scholarly journals Pengaruh Katalis Fe2O3 Pada Tabung Penyimpanan Hidrogen Berbasis MgH2 Melalui Teknik Mechanical Alloying

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Andia Fatmaliana ◽  
Maulinda Maulinda ◽  
Nirmala Sari
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Alternative Energy ◽  
Milling Time ◽  
Electrical Energy ◽  
Precipitation Method ◽  
Release Time ◽  
Hydrogen Storage Materials ◽  
Strong Bond ◽  
Hematite Fe2o3

<p>Hydrogen is an alternative energy that has a very abundant amount in nature, three-fourths of all elements in nature are hydrogen. Abundance can be developed because it can be converted into electrical energy and is expected to be able to replace fossil materials that are increasingly depleting in the future. For the management of hydrogen, a very safe storage is needed. One of the efforts by inserting hydrogen in certain metals. Magnesium is one material that is able to absorb hydrogen. But it has a disadvantage, namely the absorption and release time is very slow, this is due to the strong bond between hydrogen and magnesium. Several attempts have been intensively studied to improve the properties of Magnesium including the use of materials in the form of nanocrystals with Mechanical alloying techniques and efforts to add certain catalysts are now being actively studied. Research on the addition of Hematite (Fe2O3) catalysts to hydrogen storage materials has been carried out through Mechanical alloying techniques based on MgH2-Fe2O3. Hematite purely derived from nature has been successfully extracted chemically (precipitation method). The milled MgH2-Fe2O3 alloy samples were then analyzed by XRD and showed that the MgH2-Fe2O3 material was successfully reduced to the nanocrystal scale. The addition of catalysts and extended milling time also showed a decrease in desorption temperature.</p>

Hydrogen Storage in Magnesium-Based Alloys

MRS Bulletin ◽  
1999 ◽  
Vol 24 (11) ◽  
pp. 40-44 ◽  
Author(s):  
R.B. Schwarz
Keyword(s):  
Energy Density ◽  
Hydrogen Storage ◽  
Alternative Energy ◽  
Distribution Systems ◽  
Electrical Energy ◽  
Clean Energy ◽  
Energy System ◽  
Liquid Hydrogen ◽  
Rechargeable Batteries ◽  
Oil Crisis

Magnesium can reversibly store about 7.7 wt% hydrogen, equivalent to more than twice the density of liquid hydrogen. This high storage capacity, coupled with a low price, suggests that magnesium and magnesium alloys could be advantageous for use in battery electrodes and gaseous-hydrogen storage systems. The use of a hydrogen-storage medium based on magnesium, combined with a fuel cell to convert the hydrogen into electrical energy, is an attractive proposition for a clean transportation system. However, the advent of such a system will require further research into magnesium-based alloys that form less stable hydrides and proton-conducting membranes that can raise the operating temperature of the current fuel cells.Following the U.S. oil crisis of 1974, research into alternative energy-storage and distribution systems was vigorously pursued. The controlled oxidation of hydrogen to form water was proposed as a clean energy system, creating a need for light and safe hydrogen-storage media. Extensive research was done on inter-metallic alloys, which can store hydrogen at densities of about 1500 cm3-H2 gas/ cm3-hydride, higher than the storage density achieved in liquid hydrogen (784 cm3/cm3 at –273°C) or in pressure tanks (˜200 cm3/cm3 at 200 atm). The interest in metal hydrides accelerated following the development of portable electronic devices (video cameras, cellular phones, laptop computers, tools, etc.), which created a consumer market for compact, rechargeable batteries. Initially, nickel-cadmium batteries fulfilled this need, but their relatively low energy density and the toxicity of cadmium helped to drive the development of higher-energy-density, less toxic, rechargeable batteries.

scholarly journals Intermetallic Compounds Synthesized by Mechanical Alloying for Solid-State Hydrogen Storage: A Review

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5758
Author(s):  
Yuchen Liu ◽  
Djafar Chabane ◽  
Omar Elkedim
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Intermetallic Compounds ◽  
Physical Adsorption ◽  
Solid Hydrogen ◽  
Hydrogen Energy ◽  
Hydrogen Storage Materials ◽  
Storage Method ◽  
Storage Materials ◽  
Storage Technology

Hydrogen energy is a very attractive option in dealing with the existing energy crisis. For the development of a hydrogen energy economy, hydrogen storage technology must be improved to over the storage limitations. Compared with traditional hydrogen storage technology, the prospect of hydrogen storage materials is broader. Among all types of hydrogen storage materials, solid hydrogen storage materials are most promising and have the most safety security. Solid hydrogen storage materials include high surface area physical adsorption materials and interstitial and non-interstitial hydrides. Among them, interstitial hydrides, also called intermetallic hydrides, are hydrides formed by transition metals or their alloys. The main alloy types are A2B, AB, AB2, AB3, A2B7, AB5, and BCC. A is a hydride that easily forms metal (such as Ti, V, Zr, and Y), while B is a non-hydride forming metal (such as Cr, Mn, and Fe). The development of intermetallic compounds as hydrogen storage materials is very attractive because their volumetric capacity is much higher (80–160 kgH2m−3) than the gaseous storage method and the liquid storage method in a cryogenic tank (40 and 71 kgH2m−3). Additionally, for hydrogen absorption and desorption reactions, the environmental requirements are lower than that of physical adsorption materials (ultra-low temperature) and the simplicity of the procedure is higher than that of non-interstitial hydrogen storage materials (multiple steps and a complex catalyst). In addition, there are abundant raw materials and diverse ingredients. For the synthesis and optimization of intermetallic compounds, in addition to traditional melting methods, mechanical alloying is a very important synthesis method, which has a unique synthesis mechanism and advantages. This review focuses on the application of mechanical alloying methods in the field of solid hydrogen storage materials.

Hydrogen Absorpsivity-Desorbsivity of Mg Doped by Ni, Cu, Al Produced by Mechanical Alloying

2013 ◽  
Vol 789 ◽  
pp. 37-41
Author(s):  
Widyastuti ◽  
Budi P. Febrian ◽  
Sutarsis
Keyword(s):  
Particle Size ◽  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Milling Time ◽  
Weight Percent ◽  
Manufacturing Method ◽  
Highest Weight ◽  
Hydrogenation Temperature ◽  
Element Addition ◽  
Mg Doped

Mg, in the form of MgH2,is one kinds of materials widely used as hydrogen storage materials. Absorption and desorption properties of hydrogen which comes from metal hydride depend on materials itself, addition of elements, as well as manufacturing method. In this research, Mg as hydrogen storage were prepared by mechanical alloying with Ni, Cu, and Al as element addition and variation milling time for 10, 20 and 30 hours. Some morphological analyses (XRD, SEM) were done to observe phase transformation. Absorption and desorption properties characterization were employed by DSC and hydrogenation tests. The improvement in milling time decreased particle size, therefore enhanced wt% of absorbed hydrogen and decrease onset desorption temperature. However, the excessive of agglomeration and cold welding on mechanical alloying process resulted in bigger particle size. Alloying elements, Al and Cu, served as catalyst, while Ni acted as alloying which reacted with hydrogen. Mg10wt%Al with 20 hours milling time at hydrogenation temperature 250°C, 3 atm pressure, and 1 hour holding time resulted in the highest weight percent of H2(0.38%wt). However, Mg10wt%Al with 30 hours milling time had the lowest onset temperature, 341.49°C

scholarly journals Pengaruh Temperatur Aniling Material Mgalti Terhadap Media Penyimpan Hidrogen

2019 ◽  
Vol 12 (2) ◽  
pp. 87
Author(s):  
Sabtun Ismi Khasanah ◽  
Nandha Riveri Sesunan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Alternative Energy ◽  
Catalyst Activity ◽  
Hydrogen Gas ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Reactive Mechanical Alloying

Hidrogen merupakan salah satu sumber energi alternatif di masa depan. Penyimpanan Hidrogen dalam bentuk solid state memiliki keunggulan daripada penyimpanan dalam bentuk gas dan cair. Penelitian ini dilakukan untuk mempelajari pengaruh material MgAlTi dan temperatur aniling material (MgAlTi) hasil preparasi reactive mechanical alloying (RMA) terhadap sifat media penyimpan hidrogen. Penambahan paduan logam Al dan Ti pada paduan logam Mg dilakukan untuk memperbaiki sifat serapan Mg. Penelitian dilakukan dengan memadukan material Mg, Al dan Ti dengan komposisi berat berturut-turut 85, 15 dan 5 %. Ketiga logam dipadukan dengan teknik RMA. Persiapan pemaduan dilakukan dalam glove box yang dialiri gas argon untuk memastikan pengerjaan teknik RMA dalam keadaan inert. Pemaduan teknik RMA dilakukan selama 10 jam dengan dialiri gas Hidrogen. Selanjutnya, paduan Mg85Al15+Ti5 di anil dengan variasi temperatur pemanasan 300; 340; dan 380 °C. Karakterisasi struktur kristal, mikro dan termal uji diobservasi dengan menggunakan X-Ray Difraction, SEM-EDX dan  Differential Scanning Calorimetry (DSC). Hasil analisis struktur kristal dan mikro sesudah di aniling menjadi homogen dan hasil ini menunjukkan bahwa temperatur optimum material penyimpan hidrogen terjadi pada temperatur 300 °C. Aktifitas katalis terhadap disosiasi ikatan Mg-H2 dapat menentukan penurunan temperatur desorpsi dibandingkan pengaruh temperatur aniling. Pemaduan teknik RMA pada paduan logam MgAlTi dapat meningkatkan sifat-sifat penyimpanan hidrogen. Hydrogen is an alternative energy source and it has advantages to storage the element in form of solid state compare gas and liquid. The study was conducted to analyse the effect of MgAlTi in aniling temperature used reactive mechanical alloying (RMA) for hydrogen storage. The experimental was carried out to improve the absorption Mg by combination of Mg, Al and Ti materials with 85, 15 and 5% weight composition. The preparation is carried out in the glove box which is flowed with argon gas to ensure the work of the RMA technique in an inert state. The RMA techniques is carried out for 10 hours with Hydrogen gas flowing. Thus, the Mg85Al15 + Ti5 alloy is annealed with a heating temperature variation of 300; 340; and 380 °C. Characterization of crystal structure, micro and thermal tests were observed using X-Ray Difraction, SEM-EDX and Differential Scanning Calorimetry (DSC). The results of analysis of the crystal and micro structures after aniling become homogeneous and this shows that the optimum temperature of the hydrogen storage material occurs at a temperature of 300 °C. Moreover, the catalyst activity against dissociation of Mg-H2 bonds can determine the decrease in desorption temperature compared to the effect of aniling temperature. The integration of RMA techniques in MgAlTi metal alloys can improve hydrogen storage.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

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