Enhancing the Regeneration Process of Consumed NaBH4 for Hydrogen Storage

Ouyang, Luizhang; Chen, Wei; Liu, Jiangwen; Felderhoff, Michael; Wang, Hui; Zhu, Min

doi:10.1002/aenm.201700299

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Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

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Felderhoff, Michael
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Ouyang, L., Chen, W., Liu, J., Felderhoff, M., Wang, H., & Zhu, M. (2017). Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage. Advanced Energy Materials, 7(19): 1700299. doi:10.1002/aenm.201700299.

Cite as: https://hdl.handle.net/21.11116/0000-0000-C16D-C

Abstract

Sodium borohydride (NaBH₄) is regarded as an excellent hydrogen-generated material, but its irreversibility of hydrolysis and high cost of regeneration restrict its large-scale application. In this study a convenient and economical method for NaBH₄ regeneration is developed for the first time without hydrides used as starting materials for the reduction process. The real hydrolysis by-products (NaBO₂·2H₂O and NaBO₂·4H₂O), instead of dehydrated sodium metaborate (NaBO₂), are applied for the regeneration of NaBH₄ with Mg at room temperature and atmospheric pressure. Therefore, the troublesome heat-wasting process to obtain NaBO₂ using a drying procedure at over 350 °C from NaBO₂·xH₂O is omitted. Moreover, the highest regeneration yields of NaBH₄ are achieved to date with 68.55% and 64.06% from reaction with NaBO₂·2H₂O and NaBO₂·4H₂O, respectively. The cost of NaBH₄ regeneration shows a 34-fold reduction compared to the previous study that uses MgH₂ as the reduction agent, where H₂ is obtained from a separate process. Furthermore, the regeneration mechanism of NaBH₄ is clarified and the intermediate compound, NaBH₃(OH), is successfully observed for the first time during the regeneration process.