Thermodynamics of the decomposition of aluminum chloride hexahydrate to prepare alumina

Yang, Youjian; Wang, Ning; Pang, Xiaojuan; Yasinskiy, Andrey; Tan, Yajie; Yu, Jiangyu; Wang, Zhaowen; Shi, Zhongning

doi:10.1016/j.jmrt.2021.11.099

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…As the temperature increases to 450 °C, Al(OH) 3 decomposes into Al 2 O 3 and H 2 O. [ 31 ] The passivation provided by AlCl x at 450 °C and higher temperature is likely due to Al 2 O 3 and also the chemical passivation of the remnant Cl, as suggested by the EDS maps in Figure 4. Further introducing a SiO 2 interlayer, τ eff reaches 152 µs after annealing at 450 °C.…”

Section: Resultsmentioning

confidence: 99%

Aluminum Halide‐Based Electron‐Selective Passivating Contacts for Crystalline Silicon Solar Cells

Gao,

Xing,

et al. 2024

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Extensive research has focused on developing wide‐bandgap metal compound‐based passivating contacts as alternatives to conventional doped‐silicon‐layer‐based passivating contacts to mitigate parasitic absorption losses in crystalline silicon (c‐Si) solar cells. Herein, thermally‐evaporated aluminum halides (AlX)‐based electron‐selective passivating contacts for c‐Si solar cells are investigated. A low contact resistivity of 60.5 and 38.4 mΩ cm2 is obtained on the AlClx/n‐type c‐Si (n‐Si) and AlFx/n‐Si heterocontacts, respectively, thanks to the low work function of AlX. Power conversion efficiencies (PCEs) of 19.1% and 19.6% are achieved on proof‐of‐concept n‐Si solar cells featuring a full‐area AlClx/Al and AlFx/Al passivating contact, respectively. By further implementing an ultrathin SiO2 passivation interlayer and a pre‐annealing treatment, the electron selectivity (especially the surface passivation) of AlX is significantly enhanced. Accordingly, a remarkable PCE of 21% is achieved on n‐Si solar cells featuring a full‐area SiO2/AlFx/Al rear contact. AlFx‐based electron‐selective passivating contacts exhibit good thermal stability up to ≈400 °C and better long‐term environmental stability. This work demonstrates the potential of AlFx‐based electron‐selective passivating contact for solar cells.

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Section: Resultsmentioning

confidence: 99%

Aluminum Halide‐Based Electron‐Selective Passivating Contacts for Crystalline Silicon Solar Cells

Gao,

Xing,

et al. 2024

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“…The first endo-effect at 207 • C with the major mass loss is clearly related to the decomposition of ACH to form amorphous Al 2 O 3 [55]. The exothermic peak at 736 • C is responsible for the transition from amorphous Al 2 O 3 to γ-Al 2 O 3 [56]. The endothermic peak at 798 • C is apparently the melting point of NaCl [57].…”

Section: Alumina Precipitationmentioning

confidence: 98%

Recovery of Scandium, Aluminum, Titanium, and Silicon from Iron-Depleted Bauxite Residue into Valuable Products: A Case Study

et al. 2022

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Bauxite residue is a high-iron waste of the alumina industry with significant contents of scandium, aluminum, and titanium. This study focuses on the recovery of Sc, Al, Ti, and Si from iron-depleted bauxite residue (IDBR) into valuable products. Iron depletion was carried out using reduction roasting followed by low-intensity magnetic separation to enrich bauxite residue in Al, Ti, and Sc and reduce an adverse effect of iron on scandium extraction. Hydrochloric high-pressure acid leaching, aluminum precipitation by saturation of the acid leachate, solvent extraction of scandium using di(2-ethylhexyl) phosphoric acid (HDEHP) and tributyl phosphate (TBP), alkaline leaching of the acid residue with subsequent silica precipitation were used to obtain appropriate selective concentrates. As a result, scandium concentrate of 94% Sc2O3, crude alumina of 93% Al2O3, titanium concentrate of 41.5% TiO2, and white carbon of 77% SiO2 were prepared and characterized. Based on the characterization of the treatment stages and the obtained valuable products, the prospect for the application of the suggested flowsheet was discussed.

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“…Even though the aluminum content of secondary aluminum ash is obviously lower than that of primary aluminum ash, the total mass of aluminum containing phases is still more than 50% with a large utilization value. 13 Under different climatic conditions, salts (e.g., NaCl, KCl and NaF) and toxic nonmetal ions (e.g., fluoride, CN − and NH 4 + ) in SAA can easily penetrate soils, which may put human health and environmental safety at risk. 14 In addition, when exposed to the external environment, SAA reacts with water and water vapor to slowly release gases.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

Ren

Chen

et al. 2023

React. Chem. Eng.

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Thermodynamics of the decomposition of aluminum chloride hexahydrate to prepare alumina

Cited by 9 publications

References 13 publications

Aluminum Halide‐Based Electron‐Selective Passivating Contacts for Crystalline Silicon Solar Cells

Aluminum Halide‐Based Electron‐Selective Passivating Contacts for Crystalline Silicon Solar Cells

Recovery of Scandium, Aluminum, Titanium, and Silicon from Iron-Depleted Bauxite Residue into Valuable Products: A Case Study

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

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