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A Novel Self-Assembling Al-based Composite Powder with High Hydrogen Generation Efficiency.

Wang C, Liu Y, Liu H, Yang T, Chen X, Yang S, Liu X - Sci Rep (2015)

Bottom Line: The results indicated that the powders formed unique core/shell microstructures with cracked surfaces and (Bi, Sn)-rich phases distributed on the Al grain boundaries.The powders exhibited good oxidation resistance and reacted violently with distilled water at temperatures as low as 0 °C.The mechanisms of the hydrolysis reactions were also analyzed.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P. R. China.

ABSTRACT
In this study, a novel self-assembling hydrogen generation powder comprised of 80Al-10Bi-10Sn wt.% was prepared using the gas atomization method and then collected in an air environment. The morphological and hydrolysis properties of the powders were investigated. The results indicated that the powders formed unique core/shell microstructures with cracked surfaces and (Bi, Sn)-rich phases distributed on the Al grain boundaries. The powders exhibited good oxidation resistance and reacted violently with distilled water at temperatures as low as 0 °C. Furthermore, at 30 °C, the powders exhibited a hydrogen conversion yield of 91.30% within 16 minutes. The hydrogen produced by this powder could be directly used in proton exchange membrane fuel cells. The mechanisms of the hydrolysis reactions were also analyzed.

No MeSH data available.


(a–d) SEM images of the 80Al-10Bi-10Sn wt.% powders reacting with distilled water at 30 °C for different amounts of time: (a) before the reactions, (b) after 30 seconds, (c) after 10 minutes, and (d) after 1 hour; (e) schematic illustration of the reaction mechanisms of the powders reacting with distilled water at 30 °C.
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f3: (a–d) SEM images of the 80Al-10Bi-10Sn wt.% powders reacting with distilled water at 30 °C for different amounts of time: (a) before the reactions, (b) after 30 seconds, (c) after 10 minutes, and (d) after 1 hour; (e) schematic illustration of the reaction mechanisms of the powders reacting with distilled water at 30 °C.

Mentions: In order to investigate the reaction mechanisms of the powders, the solid hydrolysis products of the powders in distilled water at 30 °C for different amounts of time were analyzed. The results are shown in Fig. 3(a–d). As Fig. 3a shows, before the reactions occurred, the powders were characterized by cracked surfaces with linear (Bi, Sn)-rich phases throughout the grain boundaries. After reacting with distilled water for only 30 seconds (Fig. 3b), the powders became detached from the grain boundaries, forming flower-like structures. After 10 minutes, the powders were broken into small particles (Fig. 3c). After 1 hour, only latticed Al(OH)3 was visible (Fig. 3d)313233.


A Novel Self-Assembling Al-based Composite Powder with High Hydrogen Generation Efficiency.

Wang C, Liu Y, Liu H, Yang T, Chen X, Yang S, Liu X - Sci Rep (2015)

(a–d) SEM images of the 80Al-10Bi-10Sn wt.% powders reacting with distilled water at 30 °C for different amounts of time: (a) before the reactions, (b) after 30 seconds, (c) after 10 minutes, and (d) after 1 hour; (e) schematic illustration of the reaction mechanisms of the powders reacting with distilled water at 30 °C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663537&req=5

f3: (a–d) SEM images of the 80Al-10Bi-10Sn wt.% powders reacting with distilled water at 30 °C for different amounts of time: (a) before the reactions, (b) after 30 seconds, (c) after 10 minutes, and (d) after 1 hour; (e) schematic illustration of the reaction mechanisms of the powders reacting with distilled water at 30 °C.
Mentions: In order to investigate the reaction mechanisms of the powders, the solid hydrolysis products of the powders in distilled water at 30 °C for different amounts of time were analyzed. The results are shown in Fig. 3(a–d). As Fig. 3a shows, before the reactions occurred, the powders were characterized by cracked surfaces with linear (Bi, Sn)-rich phases throughout the grain boundaries. After reacting with distilled water for only 30 seconds (Fig. 3b), the powders became detached from the grain boundaries, forming flower-like structures. After 10 minutes, the powders were broken into small particles (Fig. 3c). After 1 hour, only latticed Al(OH)3 was visible (Fig. 3d)313233.

Bottom Line: The results indicated that the powders formed unique core/shell microstructures with cracked surfaces and (Bi, Sn)-rich phases distributed on the Al grain boundaries.The powders exhibited good oxidation resistance and reacted violently with distilled water at temperatures as low as 0 °C.The mechanisms of the hydrolysis reactions were also analyzed.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P. R. China.

ABSTRACT
In this study, a novel self-assembling hydrogen generation powder comprised of 80Al-10Bi-10Sn wt.% was prepared using the gas atomization method and then collected in an air environment. The morphological and hydrolysis properties of the powders were investigated. The results indicated that the powders formed unique core/shell microstructures with cracked surfaces and (Bi, Sn)-rich phases distributed on the Al grain boundaries. The powders exhibited good oxidation resistance and reacted violently with distilled water at temperatures as low as 0 °C. Furthermore, at 30 °C, the powders exhibited a hydrogen conversion yield of 91.30% within 16 minutes. The hydrogen produced by this powder could be directly used in proton exchange membrane fuel cells. The mechanisms of the hydrolysis reactions were also analyzed.

No MeSH data available.