Characterizations of composite NaNH 2-NaBH 4 hydrogen storage materials synthesized via ball milling

Chuan Wu; Ying Bai; Jian Hu Yang; Feng Wu; Fei Long

doi:10.1016/j.ijhydene.2011.03.171

Characterizations of composite NaNH ₂-NaBH ₄ hydrogen storage materials synthesized via ball milling

Chuan Wu^*, Ying Bai, Jian Hu Yang, Feng Wu, Fei Long

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Composite NaNH ₂-NaBH ₄ (molar ratio of 2/1) hydrogen storage materials are prepared by a ball milling method with various ball milling times. The compositions and hydrogen generation characteristics are investigated by means of X-ray diffraction (XRD) and thermo gravimetric- differential thermal analysis (TG-DTA). The structural characteristics imply that ball milling produces a new phase of Na ₃(NH ₂) ₂BH ₄, and mechanical energy accumulated in the ball milling process may be responsible for the phase change of Na ₃(NH ₂) ₂BH ₄. TG-DTA demonstrates that the phase change temperature of the composite NaNH ₂-NaBH ₄ (2/1) ball milled for 16 h is 141.8 °C, and the melting point is 197.3 °C; below 400 °C, composite hydrogen storage material is mainly decomposed to give hydrogen and Na ₃BN ₂; while above 400 °C, the previous by-product Na ₃BN ₂ continues to decompose so as to give metal Na gradually.

Original language	English
Pages (from-to)	889-893
Number of pages	5
Journal	International Journal of Hydrogen Energy
Volume	37
Issue number	1
DOIs	https://doi.org/10.1016/j.ijhydene.2011.03.171
Publication status	Published - Jan 2012

Keywords

Amide
Borohydride
Composite materials
Fuel cells
Hydrogen storage
NaNH -NaBH

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2011.03.171

Cite this

@article{19146bfe86f44fb5be56370be552f6ef,

title = "Characterizations of composite NaNH 2-NaBH 4 hydrogen storage materials synthesized via ball milling",

abstract = "Composite NaNH 2-NaBH 4 (molar ratio of 2/1) hydrogen storage materials are prepared by a ball milling method with various ball milling times. The compositions and hydrogen generation characteristics are investigated by means of X-ray diffraction (XRD) and thermo gravimetric- differential thermal analysis (TG-DTA). The structural characteristics imply that ball milling produces a new phase of Na 3(NH 2) 2BH 4, and mechanical energy accumulated in the ball milling process may be responsible for the phase change of Na 3(NH 2) 2BH 4. TG-DTA demonstrates that the phase change temperature of the composite NaNH 2-NaBH 4 (2/1) ball milled for 16 h is 141.8 °C, and the melting point is 197.3 °C; below 400 °C, composite hydrogen storage material is mainly decomposed to give hydrogen and Na 3BN 2; while above 400 °C, the previous by-product Na 3BN 2 continues to decompose so as to give metal Na gradually.",

keywords = "Amide, Borohydride, Composite materials, Fuel cells, Hydrogen storage, NaNH -NaBH",

author = "Chuan Wu and Ying Bai and Yang, {Jian Hu} and Feng Wu and Fei Long",

year = "2012",

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doi = "10.1016/j.ijhydene.2011.03.171",

language = "English",

volume = "37",

pages = "889--893",

journal = "International Journal of Hydrogen Energy",

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T1 - Characterizations of composite NaNH 2-NaBH 4 hydrogen storage materials synthesized via ball milling

AU - Wu, Chuan

AU - Bai, Ying

AU - Yang, Jian Hu

AU - Wu, Feng

AU - Long, Fei

PY - 2012/1

Y1 - 2012/1

N2 - Composite NaNH 2-NaBH 4 (molar ratio of 2/1) hydrogen storage materials are prepared by a ball milling method with various ball milling times. The compositions and hydrogen generation characteristics are investigated by means of X-ray diffraction (XRD) and thermo gravimetric- differential thermal analysis (TG-DTA). The structural characteristics imply that ball milling produces a new phase of Na 3(NH 2) 2BH 4, and mechanical energy accumulated in the ball milling process may be responsible for the phase change of Na 3(NH 2) 2BH 4. TG-DTA demonstrates that the phase change temperature of the composite NaNH 2-NaBH 4 (2/1) ball milled for 16 h is 141.8 °C, and the melting point is 197.3 °C; below 400 °C, composite hydrogen storage material is mainly decomposed to give hydrogen and Na 3BN 2; while above 400 °C, the previous by-product Na 3BN 2 continues to decompose so as to give metal Na gradually.

AB - Composite NaNH 2-NaBH 4 (molar ratio of 2/1) hydrogen storage materials are prepared by a ball milling method with various ball milling times. The compositions and hydrogen generation characteristics are investigated by means of X-ray diffraction (XRD) and thermo gravimetric- differential thermal analysis (TG-DTA). The structural characteristics imply that ball milling produces a new phase of Na 3(NH 2) 2BH 4, and mechanical energy accumulated in the ball milling process may be responsible for the phase change of Na 3(NH 2) 2BH 4. TG-DTA demonstrates that the phase change temperature of the composite NaNH 2-NaBH 4 (2/1) ball milled for 16 h is 141.8 °C, and the melting point is 197.3 °C; below 400 °C, composite hydrogen storage material is mainly decomposed to give hydrogen and Na 3BN 2; while above 400 °C, the previous by-product Na 3BN 2 continues to decompose so as to give metal Na gradually.

KW - Amide

KW - Borohydride

KW - Composite materials

KW - Fuel cells

KW - Hydrogen storage

KW - NaNH -NaBH

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