标题
作者
作者:Cai, WT (Cai, Weitong)[1,2 ]; Wang, H (Wang, Hui)[1,2 ]; Sun, DL (Sun, Dalin)[3 ]; Zhang, QA (Zhang, Qingan)[4 ]; Yao, XD (Yao, Xiangdong)[5 ]; Zhu, M (Zhu, Min)[1,2 ]
期刊信息
摘要
Destabilization by the alkali metal hydroxides LiOH, NaOH, and KOH in the solid-state dehydrogenation of LiBH4 is reported. 6.5 wt% of hydrogen was liberated within 10 minutes at 250 degrees C. Destabilization originated from the interaction between H+ in [OH](-) and H- in [BH4](-). A larger Pauling's electronegativity of the alkali metal (Li > Na > K) led to a greater acidity of the proton donor [OH](-) site, and thus enhanced destabilization. The temperature of the predominant dehydrogenation was reduced to 207, 221, and 230 degrees C, for ball milled LiBH4-LiOH, 2LiBH(4)-NaOH, and 2LiBH(4)-KOH, respectively. The LiBH4: LiOH stoichiometry greatly affected the destabilization, by providing differing reaction pathways in LiBH4-xLiOH (x = 1, 1.36, 4). The incremental increase in the LiOH content of LiBH4-xLiOH increased the dehydrogenation rate, but the temperature increased from 207 degrees C (x = 1) to 250 degrees C (x = 4). 4.1 and 6.5 wt% of hydrogen was liberated within 10 minutes by LiBH4-LiOH and LiBH4-4LiOH, respectively. The incremental increase in dehydrogenation temperature was attributed to differing [BH4](-)center dot center dot center dot/[OH](-) interactions, formed by the differing stoichiometric ratios.
关键词
KeyWords Plus:HYDROGEN STORAGE PROPERTIES; LITHIUM BOROHYDRIDES; COMPLEX HYDRIDES; STABILITY; SYSTEM; DECOMPOSITION; REVERSIBILITY; COMPOSITE; MGH2; LI
作者信息
通讯作者地址:Zhu, M (通讯作者)
 | S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China. |
地址:
电子邮件地址:dlsun@fudan.edu.cn; x.yao@griffith.edu.au; memzhu@scut.edu.cn
出版商
类别分类
研究方向:Chemistry
Web of Science 类别:Chemistry, Multidisciplinary