金屬氧化物修飾鋁粉在水中產氫之研究

Hydrogen Generation by the Reaction of Metallic Oxide-Modified Aluminum Powders in Water

鍾興威(Hsing-Wei Chung)

指導教授 ： 王宏文

中原大學/理學院/奈米科技碩士學位學程/碩士(2011年)

https://doi.org/10.6840/CYCU.2011.00236

摘要

本研究主要是利用金屬奈米級的氧化物，如二氧化鈦(P90、P25、PT501A和試藥級)、氧化鋅、二氧化矽和氧化鋁(α-Al2O3和γ-Al2O3)，來修飾金屬鋁粉體，並且在25-35℃使用自來水及去離子水反應。

自來水中二氧化鈦晶體大小不同確實會影響其產氫反應，在25-45℃中無任何修飾劑情況下金屬鋁是無任何產氫反應，但是放入35℃的去離子水中卻有氫氣產生。使用奈米級金屬氧化物在25℃去離子水中是非常有效產生氫氣。然而，其它奈米氧化物在自來水是無效的，但是二氧化鈦(P90-直徑14nm)卻在自來水中能有效的與金屬鋁反應產生氫氣，媲美我們所知的γ- Al2O3。

產氫主要是與金屬鋁接觸，並且會產生副產物氫氧化鋁，在二氧化鈦(P90)與自來水產氫的情況下，蝕孔為主要的機制，而使用去離子水卻是全面腐蝕的狀況。

關鍵字

二氧化鈦 ； 鋁 ； 去離子水 ； 產氫 ； 蝕孔

並列摘要

Metal Oxides nanocystals such as TiO2(P90, P25, PT501A and Reagent), ZnO, SiO2 and Al2O3(α-Al2O3 and γ-Al2O3) were used as modifiers on the metallic aluminum (Al) powders for the production of hydrogen in deionized water or tap water at 25-35 oC.

In particular, the influences of TiO2 nanocrystals with various crystal sizes on the production of hydrogen from the reaction in tap water under ambient condition were investigated in details. It was found that hydrogen was barely generated from metal Al powders in tap water at 25-45oC but significantly produced in deionized water above 35 oC without any modifiers. The use of metallic oxide nanocrystals were very effective to promote hydrogen generation from the reaction of Al and deionized water at 25 oC. In addition, while other oxide nanocrystals were ineffective to promote hydrogen generation in tap water, TiO2 nanocrystals (P90, ~14 nm in diameter) were found to be highly effective in facilitating the production of hydrogen from the reaction of Al with tap water, comparable to the well-known γ-Al2O3.

The production of hydrogen over time was found to be dependent on the passive layer of metal Al, where Al(OH)3 plays an important role during reaction. Pitting is proposed as the major mechanism behind the production of hydrogen in the nanocrystals TiO2 (P90)-modified Al/tap water system, which is thought to be originated from point defects. However, using deionized water situation is general corrosion.

並列關鍵字

Aluminum ； Titanium dioxide ； hydrogen generation ； Deionized water ； pitting

參考文獻

3 B. O’Regan; M. Grätzel, A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films, (414)Nature(2001)338-344.

8 K. Matsumoto; S. Takahashi; M. Ishii; M. Hoshi; A. Kurokawa; S.Ichimura; A. Ando, Application of STM Nanometer-Size Oxidation Process to Planar-Type MIM Diode, Jpn J. Appl. Phys.- Part 1 34(1995) 1387.

9 S. Y. Chou; P. R. Krauss; L. Long, Nanolithographically defined magnetic structures and quantum magnetic disk (invited), J. Appl. Phys. 79 (1996) 6101.

10 S. Y. Chou; P. R. Krauss; M. S. Wei; P. B. Fischer, Nanolithographically defined magnetic structures, Scr. Metall. Mater. 33 (1995) 1537.

11 R. Notzel; J. Temmyo; A. Kozen; T. Tamamura; T. Fukui; H. Hasegawa, Self-organized growth of quantum-dot structures, Solid-State Electronics (1996) 40 (1-8) 777-783.