Influences of Ni-Co-B catalyst on the thermal decomposition of light-weight NaNH2-NaBH4 hydrogen storage material

NaNH2 and NaBH4 were utilized to prepare a composite hydrogen storage material, NaNH2-NaBH4. To improve the thermal decomposition kinetics of NaNH2-NaBH4, which is crucial for hydrogen-release performance, Ni-Co-B was selected as a catalyst. To prepare the catalyst-promoted light-weight hydrogen storage materials, a composite hydrogen storage system was synthesized via a ball milling method with NaNH2, NaBH4, and Ni-Co-B. X-ray diffraction patterns show that the crystal structure of the NaNH2-NaBH4 is well maintained after adding catalysts. In addition, Na3BN2 and metal Na were detected as by-products in the Ni-Co-B-promoted NaNH2-NaBH4 (with a molar ratio of 2:1) after the thermal decomposition process. In addition, thermogravimetry-differential thermal analysis indicates that the main decomposition stages of the metal boride-promoted NaNH2-NaBH4 materials were split into three stages. Furthermore, the catalytic effects on the thermal decomposition kinetics were evaluated. The activation energy of the Ni...

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