Effect of Thermal Treatment of Aluminum Core-Shell Particles on Their Oxidation Kinetics in Water for Hydrogen Production

Buryakovskaya, Olesya A.; Vlaskin, Mikhail S.; Grigоrenko, A. V.

doi:10.3390/ma14216493

Cited by 10 publications

(6 citation statements)

References 61 publications

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“…The most extensively investigated ones include high reaction temperatures (above 100 • C) [25][26][27][28][29][30][31][32], various acidic [33][34][35], alkali (for aluminum) [36][37][38][39] and salt (NaCl, KCl, MgCl 2 , NiCl 2 , CoCl 2 , CuCl 2 , AlCl 3 ) [40][41][42][43][44][45][46][47][48] solutions, liquid metal embrittlement (for aluminum) [49][50][51], alloying with metals like Ca, Ni, Sn, Fe, Li, Zn, Bi, Cu (brand-new or recovered from electronic and electrical waste) [52][53][54][55][56][57][58][59][60][61], preparation of composite powders with metal (Ni, Nd, Bi, Zn, In, Wood's alloy, etc.) [62][63][64][65][66], and non-metal (e.g., NaCl, AlCl 3 , Bi 2 O 2 CO 3 , Bi(OH) 3 , Al(OH) 3 , Al 2 O 3 ) [67][68][69] additives, or their mixtures (e.g., carbon materials with Bi, Ni, Cu, Co, MgCl 2 , AlCl 3 , Ga-based eutecti...…”

Section: Introductionmentioning

confidence: 99%

Microstructural Transformation and Hydrogen Generation Performance of Magnesium Scrap Ball Milled with Devarda’s Alloy

Buryakovskaya

Vlaskin

2022

Materials

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A method for magnesium scrap transformation into highly efficient hydroreactive material was elaborated. Tested samples were manufactured of magnesium scrap with no additives, or 5 and 10 wt.% Devarda’s alloy, by ball milling for 0.5, 1, 2, and 4 h. Their microstructural evolution and reaction kinetics in 3.5 wt.% NaCl solution were investigated. For the samples with additives and of scrap only, microstructural evolution included the formation of large plane-shaped pieces (0.5 and 1 h) with their further transformation into small compacted solid-shaped objects (2 and 4 h), along with accumulation of crystal lattice imperfections favoring pitting corrosion, and magnesium oxidation with residual oxygen under prolonged (4 h) ball milling, resulting in the lowest reactions rates. Modification with Devarda’s alloy accelerated microstructural evolution (during 0.5–1 h) and the creation of ‘microgalvanic cells’, enhancing magnesium galvanic corrosion with hydrogen evolution. The 1 h milled samples, with 5 wt.% Devarda’s alloy and without additives, provided the highest hydrogen yields of (95.36 ± 0.38)% and (91.12 ± 1.19)%; maximum reaction rates achieved 470.9 and 143.4 mL/g/min, respectively. Such high results were explained by the combination of the largest specific surface areas, accumulated lattice imperfections, and ‘microgalvanic cells’ (from additive). The optimal values were 1 h of milling and 5 wt.% of additive.

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Section: Introductionmentioning

confidence: 99%

Microstructural Transformation and Hydrogen Generation Performance of Magnesium Scrap Ball Milled with Devarda’s Alloy

Buryakovskaya

Vlaskin

2022

Materials

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“…Under normal conditions, aluminum has a ‘waterproof’, slowly hydrated, protective oxide layer on its surface [ 17 ]. Micron-sized Al powders observably react with distilled water at temperatures from 68–70 °С and higher, while nanoparticles can do that at room temperature [ 18 , 19 , 20 ]. For that reason, activation measures are needed to promote that process.…”

Section: Introductionmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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A swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydro reactive powders via ball milling with silver powder and either lithium chloride or gallium. The latter substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al), promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those factors were responsible for obtaining lower hydrogen yields than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6 ± 0.2), (86.8 ± 1.4), (80.2 ± 0.5), and (76.7 ± 0.7)% of the expected hydrogen, respectively. Modification with Ag promoted Al oxidation, thus providing higher hydrogen evolution rates. The samples with Ag were tested in a CaCl2 solution as well, for which the reaction proceeded much more slowly. At a higher temperature (80 °C) after 3 h of experiment, the corresponding hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7 ± 2.1) and (31.8 ± 1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had the potential for further improvement to deliver higher hydrogen yields.

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“…Under normal conditions, aluminum has a 'waterproof', slowly hydrated, protective oxide layer on its surface [17]. Micron-sized Al powders observably react with distilled water at temperatures from 68-70 • C and higher, while nanoparticles can do that at room temperature [18][19][20]. For that reason, activation measures are needed to promote that process.…”

Section: Introductionmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Preprint

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Swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydroreactive powders via its ball milling with silver powder and either lithium chloride or gallium. The later substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al) promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those effects were responsible for obtaining hydrogen yields lower than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6±0.2), (86.8±1.4), (80.2±0.5), and (76.7±0.7)% of the expected hydrogen respectively. Modification with Ag promoted Al oxidation thus providing higher hydrogen evolution rates. The samples with Ag were tested in CaCl2 solution as well, for which the reaction proceeded much slower. At a higher temperature (80 °C) after 3 h of experiment, the hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7±2.1) and (31.8±1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had a potential for further improvement to provide higher performance.

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Effect of Thermal Treatment of Aluminum Core-Shell Particles on Their Oxidation Kinetics in Water for Hydrogen Production

Cited by 10 publications

References 61 publications

Microstructural Transformation and Hydrogen Generation Performance of Magnesium Scrap Ball Milled with Devarda’s Alloy

Microstructural Transformation and Hydrogen Generation Performance of Magnesium Scrap Ball Milled with Devarda’s Alloy

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

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