Dehydrogenation and reaction pathway of Perovskite-Type NH4Ca(BH4)3 |
| |
| Authors: | Chengguang Lang Yi Ji Jiangwen Liu Hui Wang Liuzhang Ouyang Min Zhu and Xiangdong Yao |
| |
| Institution: | 1. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou 510641, China;2. School of Natural Sciences and Queensland Micro, and Nanotechnology Centre, Griffith University, Nathan, QLD 4111, Australia;3. China-Australia Joint Laboratory for Energy & Environmental Materials, Joint Venture of Griffith University and South China University of Technology, Nathan, QLD 4111, Australia |
| |
| Abstract: | Perovskite-type borohydride, NH4Ca(BH4)3, is considered as a promising hydrogen storage material due to its high gravimetric hydrogen capacity (15.7?wt%). In this work, the dehydrogenation performance and reaction pathway of NH4Ca(BH4)3 have been systematically investigated. It is found that the initial decomposition temperature is only 65?°C, suggesting a low thermodynamic stability of NH4Ca(BH4)3. The desorption kinetics conducted by differential scanning calorimetry (DSC) indicates that the activation energy of decomposition is about 226.1?kJ/mol. The dehydrogenation pathway of NH4Ca(BH4)3 characterized by fourier-transform infrared spectroscopy (FTIR) and solid-state nuclear magnetic resonance (NMR) shows a stepwise decomposition process, in which the initial dehydrogenation is due to destabilization of H+ in NH4 and H- in BH4 followed by the subsequent dehydrogenation steps arising from the decomposition of homologous NH3BH3 and the final decomposition of Ca(BH4)2 at a high temperature, respectively. |
| |
| Keywords: | Metal borohydride Perovskite Hydrogen storage materials Solid-state NMR |
| 本文献已被 CNKI ScienceDirect 等数据库收录！ |
| 点击此处可从《自然科学进展(英文版)》浏览原始摘要信息 |
| 点击此处可从《自然科学进展(英文版)》下载免费的PDF全文 |
|
