Mechanisms of reversible hydrogen storage in NaBH4 through NdF3 addition

作者：Chong, Lina^*; Zou, Jianxin; Zenga, Xiaoqin; Ding, Wenjiang

来源：Journal of Materials Chemistry A, 2013, 1(12): 3983-3991.

DOI：10.1039/c3ta01105d

• THERMAL-DECOMPOSITION
• METAL BOROHYDRIDES
• COMPLEX HYDRIDES
• STABILITY
• IMPROVEMENT
• SYSTEM
• LIBH4
• NA

In this work, a reversible hydrogen storage composite, 3NaBH(4)/NdF3, has been prepared using a mechanical milling method. The de-/rehydrogenation properties as well as the mechanisms of reversible hydrogen sorption in the composite were carefully investigated. Based on the pressure-temperature-composition measurements, the de-/rehydrogenation enthalpies of the 3NaBH(4)/NdF3 composite are determined to be 86.4 kJ mol(-1) H-2 and -13.2 kJ mol(-1) H-2, respectively. The onset dehydriding temperature of the composite is determined to be 413 degrees C in 0.1 MPa Ar atmosphere and can be as low as 80 degrees C under vacuum conditions. Analyses revealed that NdB6, Nd2H5 and NaF were formed after the decomposition of the composite, which can be hydrogenated to produce NaBH4 and NaNdF4. The formation of NaNdF4 instead of NdF3 in the hydrogenated products is believed to be responsible for the reduced hydrogen storage capacity, while the intermediate formation of B, Nd and NdB4 during dehydrogenation accounts for the asymmetric hydriding/dehydriding behaviors in the 3NaBH(4)/NdF3 composite.

• 出版日期2013
• 单位上海交通大学