Enhancement of Hydrogen Storage in Destabilized LiNH2 with KMgH3 by Quick Conveyance of N-Containing Species

被引：30

作者：

Li, Yongtao ^{[1
,2
]}

Ding, Xiaoli ^{[1
]}

Wu, Feilong ^{[2
]}

Sun, Dalin ^{[2
]}

Zhang, Qingan ^{[1
]}

Fang, Fang ^{[2
]}

机构：

[1] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Peoples R China

[2] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2016年 / 120卷 / 03期

基金：

中国国家自然科学基金;

关键词：

H SYSTEM; LITHIUM HYDRIDE; METAL-HYDRIDES; AMIDE; MECHANISM; AMMONIA; LIH; H-2; DESORPTION; COMPLEX;

D O I：

10.1021/acs.jpcc.5b11388

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The advantage of potassium-magnesium bimetallic hydride as novel destabilization agent for LiNH2 is demonstrated by a comparative study among MgH2-, NaMgH3-, and KMgH3- systems. LiNH2 combined with KMgH3 not only results in a substantial decreased desorption temperature by >60 degrees C and suppression of NH3 release but also enhances sorption kinetics two to five times in comparison with the single MgH2 or NaMgH3. A high reversible capacity of >65% is also achieved, even recharging under milder conditions. Through detailed structural analysis on the desorption products in various stages of these combined systems, we proposed a self-concerted reaction mechanism in which the in situ formed active MgH2 and KH by KMgH3 are involved in LiNH2 decomposition. In addition, the remarkable promotion in conveyance of N-containing species by highly active KH compared with NaH is believed to be responsible for the superior destabilizing effect of KMgH3 over NaMgH3 in improving hydrogen sorption kinetics of LiNH2.

引用

页码：1415 / 1420

页数：6

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