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Enhanced hydrogen generation by solid-state thermal decomposition of NaNH2–NaBH4 composite promoted with Mg–Co–B catalyst

Published online by Cambridge University Press:  06 March 2017

Ying Bai ,
Zi-wei Pei ,
Feng Wu ,
Jian-hu Yang  and
Chuan Wu
Ying Bai
Affiliation:
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Zi-wei Pei
Affiliation:
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Feng Wu
Affiliation:
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; and Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
Jian-hu Yang
Affiliation:
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Chuan Wu*
Affiliation:
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; and Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The on-site hydrogen supply is a key issue for the commercialization of the fuel cells, which is one of the important ways for realizing a hydrogen-economy society. Composite NaNH2–NaBH4 is regarded as a promising high-capacity hydrogen storage material. In this paper, the composite NaNH2–NaBH4 (2/1) was synthesized via a solid-state ball milling method. To improve the hydrogen generation kinetics, a multiplex metal boride Mg–Co–B was selected as the catalyst. It was found that Na3BN2 and metal Na were byproducts in the thermal decomposed sample by X-ray diffraction analysis. Thermogravimetry and differential thermal analysis indicated that the main decomposition stages of the catalyst promoted NaNH2–NaBH4 material were split into three stages. The activation energy of the Mg–Co–B promoted NaNH2–NaBH4 (2/1) material below 300 °C was 76.4 KJ/mol, which is only 47.9% of that of the pristine NaNH2–NaBH4 (2/1), and implying much better hydrogen generation kinetics.

Keywords

Mg–Co–B catalystcomposite NaNH2–NaBH4hydrogen generation kinetics
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 6 , 28 March 2017 , pp. 1203 - 1209
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Xiaobo Chen

References

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