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学科主题: 物理化学
题名: Mechanism of fast hydrogen generation from pure water using Al-SnCl2 and bi-doped Al-SnCl2 composites
作者: Xu, Fen1;  Sun, Lixian1;  Lan, Xiaofen2;  Chu, Hailiang1;  Sun, Yujia4;  Zhou, Huaiying1;  Li, Fen3;  Yang, Lini5;  Si, Xiaoliang3;  Zhang, Jian3;  Walter, Serge6;  Gabelica, Zelimir6
通讯作者: 孙立贤
关键词: Al-SnCl2 composite ;  Bi-doped Al-SnCl2 composite ;  Mechanism of hydrogen generation ;  Fast hydrogen production from water
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2014-04-04
DOI: 10.1016/j.ijhydene.2014.01.154
卷: 39, 期:11, 页:5514-5521
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: The mechanism of fast hydrogen generation from pure water using selectively activated Al-SnCl2 composites was elucidated with the help of experimental data using combined XRD, SEM, EDX, DSC and calorimetric techniques. It is found that H-2 is produced from two different but simultaneous routes specific to the Al-SnCl2 composite stoichiometry achieved after ball milling the precursor that readily yields, besides the excess of Al, Sn and AlCl3. Hydrogen is simultaneously produced from the reaction of the so-formed Al-Sn alloy with water, and from the reaction of the in situ generated AlCl3 with water, yielding HCl (protons) that further again react with Al, both reactions significantly increasing the hydrogen production rate. The effect of Bi on the hydrogen conversion yield on the Al-SnCl2 composite was also investigated. The electrochemical activity of Al is further enhanced by doping Bi into Al-SnCl2 composite. Meanwhile, DFT (density functional theory) calculations show that Bi micro domains present onto the Al (111) crystallite faces of the composite significantly reduce the adsorption energy of the OH groups while, Mg- or Cr-doped Al-SnCl2 composites increase this adsorption energy. The Mulliken charge analysis indicates that Bi leads to less electron transport between Al and O atoms (weaker interaction) than pristine Al (111) surface. Bi therefore contributes to inhibit the formation of the hydroxyls on the Al metal surface, thereby allowing the clean metal to continuously react with water. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: FUEL-CELL ;  ALUMINUM ;  HYDROLYSIS ;  ACTIVATION ;  CORROSION ;  MIXTURE ;  ALLOYS ;  ENERGY
语种: 英语
WOS记录号: WOS:000334977900004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143861
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Guilin Univ Elect Technol, Sch Mat Sci & Engn, Guilin 541004, Peoples R China
2.Liaoning Normal Univ, Coll Chem & Chem Engn, Dalian 116029, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Lab, Dalian 116023, Peoples R China
4.Texas A&M Univ, College Stn, TX 77843 USA
5.Liaoning Univ, Coll Chem, Senyang 110036, Peoples R China
6.Univ Haute Alsace, ENSCMu, Lab LPI GSEC, F-68093 Mulhouse, France

Recommended Citation:
Xu, Fen,Sun, Lixian,Lan, Xiaofen,et al. Mechanism of fast hydrogen generation from pure water using Al-SnCl2 and bi-doped Al-SnCl2 composites[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2014,39(11):5514-5521.
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