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Effect on Hydrogen Generation of Microstructures of Refined Si Powders in KOH Aqueous Solution
Author NameAffiliationE-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  
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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Chinese Journal of Inorganic Chemistry