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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

本研究的目的是利用立方砧式装置探索用于未来燃料电池汽车的Mg-RE系(RE=La，Ce，Pr，Nd)和Mg-Tm系(Tm=Ti，Vr，V，Mn，Fe，Co，Ni，Cu，Zn)的新氢化物。对于MGH_2-xml%LaH_3，新氢化物的范围为25&lt；=x&lt；=33。经熔融萃取分析，x=25的新氢化物的氢含量为4.1质量%H，相当于Mg_3LaH_9。新发现的氢化物Mg_3LaH_9的晶体结构为原始的四方晶系，晶胞参数a=0.8193 nm，c=0.5028 nm。氢化物在620K附近出现吸热峰，吸热峰随La含量的增加而减小。在5 Gpa的压力下，合成了具有原始四方结构的Mg_3CeH_9和Mg_3PrH_9作为新化合物。新发现的氢化物Mg_3CeH_9和Mg_3PrH_9的晶体结构均为原始四方结构，晶胞参数分别为a=0.8118 nm，c=0.4979 nm和a=0.8118 nm，c=0.4979 nm。这些氢化物的氢含量分别为3.7和3.9质量%。在镁-镍体系中，F-43M空间群的化合物是在6 GPa下合成的新化合物，在545K放热反应中分解为镁和镁镍相。在镁-铜体系中，合成了具有CsCl型结构的镁铜化合物和属于IMMM空间群的镁铜化合物和空间群IMMM的镁铜化合物。在500K时，镁铜化合物分解为镁铜相和镁铜相；在430K时，镁铜化合物分别分解为镁相和镁铜相