Investigation of atomic and ionic transportation mechanism in complex hydrides

2014 Fiscal Year Final Research Report

• Project/Area Number: 24241034
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: OTOMO Toshiya 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (90270397)
• Co-Investigator(Kenkyū-buntansha): SAKAKI Kouji 独立行政法人産業技術総合研究所, エネルギー技術研究部門 (20392615)
• Co-Investigator(Renkei-kenkyūsha): IKEDA Kazutaka 高エネルギー加速器研究機構, 物質構造科学研究所 (80451615) ; ORIMO Shinichi 東北大学, 原子分子材料科学高等研究機構(WPI-AIMR)/金属材料研究所 (40284129)
• Research Collaborator: NAKAMURA Yumiko 独立行政法人産業技術総合研究所, エネルギー技術研究部門 ; ABE Hitoshi 高エネルギー加速器研究機構, 物質構造科学研究所 (00509937) ; SUGIYAMA Kazumasa 東北大学, 金属材料研究所 (40196762) ; ARIMA Hiroshi 東北大学, 金属材料研究所 (60535665) ; KITAJIMA Yoshinori 高エネルギー加速器研究機構, 物質構造科学研究所 (00204892) ; SATO Toyoto 東北大学, 金属材料研究所 (20455851)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 水素貯蔵材料 / 触媒 / 中性子 / 放射光 / 陽電子

Outline of Final Research Achievements

NaAlH4 is light weight and high hydrogen density material but the hydrogen desorption speed is very slow in the solid state. Ti-additives improves the speed 10 times. It is important to reveal the mechanism of the kinetics improvement by the Ti-additives to make NaAlH4 practical hydrogen storage material. The purpose of this study is to reveal the improvement mechanism of Ti-additives with neutron scattering, X-ray absorption, X-ray anomalous scattering and positron annihilation.
It was found that the chemical state of Al is changed by Ti-additives. Also, existing of two type of Ti position was found: one is the Al site of NaAlH4 and the other is Ti-Al allow outside of NaAlH4.

Free Research Field

中性子科学、水素化物構造解析