Synthesis and Hydrogen Sorption Properties of 3NaBH4/ErF3 Hydrogen Storage Composite

doi:10.7503/cjcu20111074

Abstract

Abstract:

3NaBH₄/ErF₃ hydrogen storage composite was prepared through ball milling method and its phase structure and hydrogen sorption properties were investigated. It is shown that NaBH₄ did not react with ErF₃ during ball milling. The dehydrogenation temperature of the composite, measured by thermo gravimetric-diffe-rential scanning calorimetry(TG-DSC), is 420℃, which is about 100℃ lower than the dehydrogenation temperature of pure NaBH₄. Mass loss of the composite is about 3.06%. Pressure-Composition-Temperature (PCT) tests revealed that the composite has outstanding reversible hydrogen sorption performance at moderate temperatures (355-413℃) and under quite low hydrogenation plateau pressures(<1 MPa) the maximum hydrogen storage capacity of the composite can reach up to 2.78%. It was found that NaBH₄ was regenerated during hydrogenation. Based on the PCT analyses, the hydrogenation enthalpy of the composite is determined to be -36.8 kJ/mol H₂, while the dehydrogenation enthalpy is -180.8 kJ/mol H₂. The addition of ErF₃ into NaBH₄ improves the thermodynamic performance of NaBH₄ and forms a reversible hydrogen storage composite.

Key words: Hydrogen storage material, Rare earth, Borohydride, Reversible hydrogen sorption

CLC Number:

O613.2
TB321

TrendMD:

LI Long-Jin, ZOU Jian-Xin, ZENG Xiao-Qin, DING Wen-Jiang. Synthesis and Hydrogen Sorption Properties of 3NaBH₄/ErF₃ Hydrogen Storage Composite[J]. Chem. J. Chinese Universities, 2012, 33(10): 2158.

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Synthesis and Hydrogen Sorption Properties of 3NaBH₄/ErF₃ Hydrogen Storage Composite

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