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(08): 1804-1808. doi: 10.3866/PKU.WHXB201306061 shu

Citation: 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(08): 1804-1808. doi: 10.3866/PKU.WHXB201306061 shu

KH添加对Na-Al-H配位氢化物可逆放氢性能的影响

基金项目:
国家重点基础研究发展规划(973) (2010CB631304) (973) (2010CB631304)

国家自然科学基金(51001090, 51171173) (51001090, 51171173)

中国博士后科学基金(20090262, 2012M521167) (20090262, 2012M521167)

浙江省重点科技创新团队(2010R50013)资助项目 (2010R50013)

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

English

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

1.
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
Received Date: 18 April 2013
Available Online: 09 July 2013
Fund Project:
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

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 od 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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

KH添加对Na-Al-H配位氢化物可逆放氢性能的影响

English

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

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

KH添加对Na-Al-H配位氢化物可逆放氢性能的影响

English

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

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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