标题
作者
作者:Cai, WT (Cai, Weitong)[1 ]; Yang, YZ (Yang, Yuanzheng)[1 ]; Tao, PJ (Tao, Pingjun)[1 ]; Ouyang, LZ (Ouyang, Liuzhang)[2,3 ]; Wang, H (Wang, Hui)[2,3 ]
期刊信息
摘要
Nanosized metal borides MBx (M = Mg, Ti, Fe, Si) are found to play an important role in enhancing the hydrogen storage performance of LiBH4 in this work. The hydrogen storage behavior and mechanism of these modified systems are investigated through TPD-MS, XRD, FTIR and SEM characterization methods. By introducing these metal borides into LiBH4 through ball milling, the systems display three dehydrogenation stages disclosing their similarity and distinction. The 1(st) stage starts at 190 degrees C, the 2(nd) stage ranges from 280 degrees C to 400 degrees C and the 3(rd) stage ends at 550 degrees C with a peak at round 440 degrees C similar to that of pristine LiBH4. Distinguishing features exist at the 2(nd) stage revealing the effectiveness of MBx in an order of MgB2 < TiB2 < FeB < SiB4. Significantly, reversibility up to 9.7 wt% is achieved from LiBH4 with assistance of SiB4. The catalytic effect of MBx is influenced by the Pauling electronegativity of M in MBx and the interfacial contact characteristic between LiBH4 and MBx. The larger electronegativity leads to an enhanced catalytic effect and consequently lower temperature at the major stage. In contrast to the components in the solid state, the molten LiBH4 promotes a catalytic effect due to a superior interfacial contact. These results provide an insight into designing high-performance catalysts applied to LiBH4 as a hydrogen storage material.
关键词
KeyWords Plus:REVERSIBLE HYDROGEN STORAGE; THERMODYNAMICAL STABILITIES; DESORPTION PROPERTIES; LITHIUM BOROHYDRIDES; CONIB NANOPARTICLES; DEHYDROGENATION; COMPOSITE; BEHAVIOR; SYSTEM; DESTABILIZATION
作者信息
通讯作者地址:Cai, WT (通讯作者)
 | Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China. |
| South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China. |
| South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China. |
地址:
电子邮件地址:mewtcai@gdut.edu.cn; yangyz@gdut.edu.cn; pjtao@gdut.edu.cn; meouyang@scut.edu.cn; mehwang@scut.edu.cn
出版商
类别分类
研究方向:Chemistry
Web of Science 类别:Chemistry, Inorganic & Nuclear