Thermochemical Formation of Sodium Borohydride from Sodium Tetramethoxyborate

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-11-18 DOI:10.1021/acsaem.4c0251410.1021/acsaem.4c02514

Ainee Ibrahim, Mark Paskevicius*, Aneeka Patel, Anita M. D’Angelo, Terry D. Humphries and Craig E. Buckley,

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Abstract

Sodium borohydride (NaBH₄) can be used as a hydrogen export material, but thermochemical regeneration from NaBO₂ is considered too costly to be feasible mainly due to the cost associated with recycling the metal hydride reagents. This study explores an alternative regeneration route of NaBH₄ using NaB(OCH₃)₄ instead of the widely studied NaBO₂. In situ synchrotron X-ray diffraction (SXRD) was utilized to detect the formation of NaBH₄ from NaB(OCH₃)₄ or NaBO₂ using various metal hydride reducing agents (NaH, MgH₂, Mg₂FeH₆, LiAlH₄, NaAlH₄, CaNi₅H_x, and LaNi₅H_x). NaBH₄ formation was detected using NaB(OCH₃)₄ with NaH (265–320 °C), MgH₂ (310–440 °C), NaAlH₄ (>140 °C), and LiAlH₄ (>20 °C). In contrast, regeneration from NaBO₂ required higher temperatures, with NaBH₄ formation using MgH₂ (>430 °C), Mg₂FeH₆ (>460 °C), NaAlH₄ (>140 °C), and LiAlH₄ (>110 °C). Notably, the reaction between NaB(OCH₃)₄ and NaH yields NaOCH₃, whereas the reaction between NaB(OCH₃)₄ and MgH₂ yields Mg(OCH₃)₂, which may offer lower energy recycling of the metal hydrides. This study also underscores the critical role of hydridic hydrogen (H^–) in solid-state thermochemical reactions for NaBH₄ formation and presents an alternative regeneration route using NaB(OCH₃)₄ that could offer cost and energy savings.

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.