High Pressure Synthesis of Novel Hydrides with High Hydrogen Content for Fuel Cell Vehicle

高压合成燃料电池汽车用高氢含量新型氢化物

基本信息

批准号：
14350364
负责人：
OKADA Masuo
金额：
$ 8.32万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350364/
关键词：
Hydrogen storage New hydrides high pressure synthesis Fuel cell New Mg-Re hydrides New Mg-Cu compound New Mg-Ni compound 高圧合成法水素化物水素アルカリ土類金属水素吸蔵合金水素エネルギープロチウム

项目摘要

The purpose of this study is to explore new hydrides of the Mg-RE systems (RE= La, Ce, Pr, Nd) and Mg-TM systems (TM= Ti, Vr, V, Mn, Fe, Co, Ni, Cu, Zn) using the cubic anvil-type apparatus, for the usage for the future fuel cell vehicle.For MgH_2 -x ml% LaH_3, the new hydride was obtained in the range of 25<=x<= 33. The hydrogen content of the new hydride with x=25 was found to be 4.1mass%H, which is corresponding to Mg_3LaH_9, by means of fusion extraction analysis. The crystal structure of newly found hydrides of Mg_3LaH_9, was a primitive tetragonal with a lattice parameter of a=0.8193nm, c=0.5028 nm. The hydrides showed an endothermic peak at around 620K, which decreases with increasing La content.Mg-Ce-H and Mg-Pr-H systems were also explored. Mg_3CeH_9 and Mg_3PrH_9 with a primitive tetragonal structure were synthesized as new compounds under 5GPa. The crystal structures of newly found hydrides of Mg_3CeH_9 and Mg_3PrH_9, was a primitive tetragonal with a lattice parameter of a=0.8118nm, c=0.4979 nm, and of a=0.8118nm, c=0.4979nm, respectively. The hydrogen contents of these hydrides were 3.7 and 3.9mass%, respectively.In Mg-Ni system, Mg_4-Ni compound belonging to space group F-43m was synthesized as a new compound under 6 GPa, which decomposed to the Mg and Mg_2Ni phases at 545 K as exothermic reaction. In Mg-Cu system, two new compounds such as the MgCu compound which has CsCl-type structure and Mg_<51>Cu_<20> compound belonging to space group Immm, were synthesized at 1073 K for 8 h under 6 GPa. The MgCu compound decomposed to the Mg_2Cu and MgCu_2 phases at 500 K and Mg_<51>Cu_<20> compound did to the Mg and Mg_2Cu phases at 430 K, respectively

这项研究的目的是探索MG-RE系统（RE = LA，CE，PR，ND）和MG-TM系统（TM = Ti，VR，VR，V，V，MN，FE，CO，Ni，Ni，Ni，Cu，Zn），使用立方砧型型中的for Mgh_2-ml lyah the for Mgh_2 -mgh_2-lyah ty ryah the type type。 25 <= x <= 33。通过融合提取分析，发现新氢化物的氢含量为4.1mass％h，对应于mg_3lah_9。新发现的MG_3LAH_9的氢化物的晶体结构是一种原始的四方，其晶格参数为a = 0.8193nm，C = 0.5028 nm。氢化物在620k左右显示出吸热峰，随着LA含量的增加而降低。MG-CE-H和MG-PR-H系统。具有原始四方结构的MG_3CEH_9和MG_3PRH_9被合成为5GPA下的新化合物。新发现的MG_3CEH_9和MG_3PRH_9的氢化物的晶体结构是一种原始的四方，其晶格参数为a = 0.8118nm，C = 0.4979 nm，A = 0.8118nm，C = 0.4979nm。这些氢化物的氢含量分别为3.7和3.9mass％。在MG-Ni系统中，属于空间组F-43M的MG_4-Ni化合物合成为6 GPA，分解于MG和MG_2NI阶段，在545 K时，该化合物分解为545 K，作为玻璃体效应。在MG-CU系统中，将具有CSCL型结构的MGCU化合物和Mg_ <51> Cu_ <20>属于Space Grout IMMM的化合物的MGCU化合物在1073 K下合成8小时，持续8小时在6 GPA下。分解为Mg_2cu和MGCU_2的MGCU分别在430 K时对Mg和Mg_2cu阶段分别对MG__2CU的MGCU_2阶段分别对Mg和Mg_2cu进行了分析。