Hydrogen desorption improvement of the LiNH₂-LiH-KF composite

Bao-Xia Dong, Jing-Jing Gao, Hui Tian, Yun-Lei Teng*, Long-Zheng Wang,Wen-Long Liu

School of Chemistry and Chemical Engineering, Yangzhou University

Abstract: Interestingly, an obvious enhancement of the hydrogen storage property is achieved by introducing KF into the LiNH₂-LiH system, while KCl, KBr or KI does not show obvious effect on improving the hydrogen storage properties of the LiNH₂-LiH system. In comparison with that of the LiNH₂-LiH composite, the hydrogen desorption curve of the LiNH₂-LiH-0.05 KF composite becomes sharp and the dehydrogenation onset and peak temperaturesare decreased by about 36^oC and 38^oC, respectively. The cyclic capacity and desorption kinetic of the LiNH₂-LiH-0.05 KF composite in the tenth cycle are still muchbetter than that of the LiNH₂-LiH composite in the second cycle. Cyclic performance can be improved at least 4 times by addition of 5 mol% KF. Detailed structural investigations reveal that during the heat-treatment, the doped potassium fluoride can react with LiH and convert to potassium hydride, which induces the improvement in hydrogen storage properties of the LiNH₂-LiH system.

Int. J. Hydrogen Energy, 2016,41,16122–16128

文章链接：http://www.sciencedirect.com/science/article/pii/S0360319916302543