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

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: 6 June 2013
Fund Project: 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)

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.
- Complex hydride,
- NaAlH₄,
- KH,
- CeCl₃,
- Dehydrogenation kinetics
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