KH添加对Na-Al-H配位氢化物可逆放氢性能的影响  

Influence of KH on Reversible Dehydriding Performance of Na-Al-H Complex Hydride

作　　者：王顺葵[1] 李志杰[2] 肖学章[1] 范修林[1] 陈志文[1] 李寿权[1] 葛红卫[1] 陈立新[1] 

机构地区：[1]浙江大学材料科学与工程学系,浙江省电池新材料与应用技术研究重点实验室,杭州310027 [2]甘肃工业职业技术学院,甘肃天水741025

出　　处：《物理化学学报》2013年第8期1804-1808,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划(973)(2010CB631304);国家自然科学基金(51001090;51171173);中国博士后科学基金(20090262;2012M521167);浙江省重点科技创新团队(2010R50013)资助项目~~

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/yKH(y=0.02,0.04)为催化添加剂,在室温和3MPa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°C放氢时可在20min内完成脱氢过程,且在较低温度(100-140°C)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.The Na-AI-H complex hydride was prepared by reactive ball milling （NaH/AI＋CeCI3） and （Nail/ AI＋CeCIJyKH） （y=0.02, 0.04） composites under a hydrogen pressure of 3 MPa at room temperature, using Nail and AI powder as raw materials, as well as 2% （molar fraction, x） CeCI3 and 2% CeCIJyKH （y=0.02, 0.04） as dopant, respectively. The de-/hydrogenation properties showed that the addition of KH could effectively improve the dehydrogenation kinetics of the second decomposition step for the Na-AI-H system. The （NaH/AI＋CeCIJ0.02KH） composite completed the dehydrogenation process within 20 min at 170 ℃, with good de-/hydrogenation cycling performance at relatively low temperatures （100-140 ℃）. Calculation by the Kissenger method showed that the addition of KH decreased the apparent activation energy of the second decomposition step of the Na-AI-H system, resulting in a decrease of desorption peak temperatures. Phase structure analysis showed that the enhanced second step dehydrogenation kinetics of the Na-AI-H composite system was mainly ascribed to the lattice volume expansion of Na3AIH6 that resulted from the addition of KH.

关 键 词：配位氢化物 NaAlH4 KH CECL3 放氢动力学 

分 类 号：O641.4[理学—物理化学]