| KH添加对Na-Al-H配位氢化物可逆放氢性能的影响 |
| |
| 引用本文： | 王顺葵,李志杰,肖学章,范修林,陈志文,李寿权,葛红卫,陈立新.KH添加对Na-Al-H配位氢化物可逆放氢性能的影响[J].物理化学学报,2013,29(8):1804-1808. |
| |
| 作者姓名： | 王顺葵 李志杰 肖学章 范修林 陈志文 李寿权 葛红卫 陈立新 |
| |
| 作者单位： | 1.Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China;2.College of Gansu Vocational Technology, Tianshui 741025, Gansu Province, P. R. China |
| |
| 基金项目： | The project was supported by the National Key Basic Research Program of China (973)，National Natural Science Foundation of China，China Postdoctoral Science Foundation，Key Science & Technology Innovation Team of Zhejiang Province;China，国家重点基础研究发展规划(973)，国家自然科学基金，中国博士后科学基金，浙江省重点科技创新团队 |
| |
| 摘 要： | 以NaH粉和Al 粉为合成原料, 分别采用2% (摩尔分数, x) CeCl3和2% CeCl3/y% KH (y=0.02, 0.04)为催化添加剂, 在室温和3 MPa氢压下, 通过反应球磨(NaH/Al+CeCl3)和(NaH/Al+CeCl3/yKH) (y=0.02, 0.04)复合物成功制备出Na-Al-H 配位氢化物. 吸放氢性能测试结果表明, KH的加入能有效改善Na-Al-H 体系中第二步脱氢反应放氢动力学性能. (NaH/Al+CeCl3/0.02KH)复合物170℃放氢时可在20 min内完成脱氢过程, 且在较低温度(100-140℃)下具有良好的可逆吸放氢性能. Kissenger 方法计算表明, 添加KH可降低Na-Al-H 体系第二步脱氢反应的表观活化能, 降低其放氢峰值温度. 相结构分析表明, KH的添加使Na-Al-H 体系中Na3AlH6的晶胞体积发生膨胀, 进而提高体系的第二步放氢动力学性能.
|
| 关 键 词： | 配位氢化物 NaAlH4 KH CeCl3 放氢动力学 |
| 收稿时间： | 2013-04-18 |
| 修稿时间： | 2013-06-06 |
Influence of KH on Reversible Dehydriding Performance of Na-Al-H Complex Hydride |
| |
| WANG Shun-Kui,LI Zhi-Jie,XIAO Xue-Zhang, FAN Xiu-Lin,CHEN Zhi-Wen,LI Shou-Quan,GE Hong-Wei,CHEN Li-Xin.Influence of KH on Reversible Dehydriding Performance of Na-Al-H Complex Hydride[J].Acta Physico-Chimica Sinica,2013,29(8):1804-1808. |
| |
| Authors: | WANG Shun-Kui LI Zhi-Jie XIAO Xue-Zhang FAN Xiu-Lin CHEN Zhi-Wen LI Shou-Quan GE Hong-Wei CHEN Li-Xin |
| |
| Institution: | 1.Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China;2.College of Gansu Vocational Technology, Tianshui 741025, Gansu Province, P. R. China |
| |
| Abstract: | The Na-Al-H complex hydride was prepared by reactive ball milling (NaH/Al+CeCl3) and (NaH/Al+CeCl3/yKH) (y=0.02, 0.04) composites under a hydrogen pressure of 3 MPa at room temperature, using NaH and Al powder as raw materials, as well as 2% (molar fraction) CeCl3 and 2% CeCl3/y% KH (y=0.02, 0.04) as dopant, respectively. The de-/hydrogenation properties show that the addition of KH can effectively improve the dehydrogenation kinetics of second decomposition step for Na-Al-H system. The (NaH/Al+CeCl3/0.02KH) composite can complete dehydrogenation process within 20 min at 170℃, with good de-/hydrogenation cycling performance at relatively low temperature (100-140℃). Calculation by Kissenger method shows that the addition of KH could decrease the apparent activation energy of second decomposition step for Na-Al-H system, resulting in the decrease of desorption peak temperatures. Phase structure analysis shows that the enhanced second step dehydrogenation kinetics of Na-Al-H composite system is mainly ascribed to the lattice volume expansion of Na3AlH6 resulted from the addition of KH. |
| |
| Keywords: | Complex hydride NaAlH4 KH CeCl3 Dehydrogenation kinetics |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《物理化学学报》浏览原始摘要信息 |
| 点击此处可从《物理化学学报》下载免费的PDF全文 |
|
