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Effect on Hydrogen Generation of Microstructures of Refined Si Powders in KOH Aqueous Solution |
Author Name | Affiliation | E-mail | LIAO Jian | Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China | | WU Chao-Ling | Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China | wmeimeiw07@163.com | CHEN Yun-Gui | Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China | | ZHONG Shuang | Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China | | LIAO Qian-Cheng | Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China | | CUI Li-Yao | Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China | |
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Abstract: Effects of high-energy ball milling on the microstructures of Si powders and consequently on the efficiency of Si-water reaction and the hydrogen generation behaviors are studied. During the milling process, both particle sizes and crystallite sizes of the powders decrease, but agglomerations, as well as the content of oxygen, internal strains, distortions and dislocations in the powders increase, and amorphous phase transformation of Si also appears on the particle surface. The increasing defects, including grain boundaries, internal strains, distortions and dislocations, amorphous phase transformation and powder refinement contribute to the hydrolysis performance of the powders. However, the growing contamination and agglomerations deteriorate the hydrolysis performance of the Si powders. The Si powders milled for 1 h have the best hydrolysis performances and produce 1 484.2 mL·gSi-1 at 70℃, whose hydrogen conversion rate reaches 94%. However, the residual~6%(w/w) of Si is out of reaction primarily owing to the fact that the hydrolysis byproduct SiO2 adhering on the Si surface restrains the further reaction. |
Keywords: hydrogen production hydrolysis powder refinement silicon-water reaction |
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LIAO Jian,WU Chao-Ling,CHEN Yun-Gui,ZHONG Shuang,LIAO Qian-Cheng,CUI Li-Yao.Effect on Hydrogen Generation of Microstructures of Refined Si Powders in KOH Aqueous Solution[J].Chinese Journal of Inorganic Chemistry,2018,34(8):1555-1565. |
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