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Closing the Loop for Hydrogen Storage: Facile Regeneration of NaBH 4 from its Hydrolytic Product
Author(s) -
Zhu Yongyang,
Ouyang Liuzhang,
Zhong Hao,
Liu Jiangwen,
Wang Hui,
Shao Huaiyu,
Huang Zhenguo,
Zhu Min
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201915988
Subject(s) - sodium borohydride , hydrolysis , hydrogen storage , hydrogen , aqueous solution , chemistry , hydrogen production , chemical engineering , borohydride , materials science , inorganic chemistry , organic chemistry , catalysis , engineering
Sodium borohydride (NaBH 4 ) is among the most studied hydrogen storage materials because it is able to deliver high‐purity H 2 at room temperature with controllable kinetics via hydrolysis; however, its regeneration from the hydrolytic product has been challenging. Now, a facile method is reported to regenerate NaBH 4 with high yield and low costs. The hydrolytic product NaBO 2 in aqueous solution reacts with CO 2 , forming Na 2 B 4 O 7 ⋅10 H 2 O and Na 2 CO 3 , both of which are ball‐milled with Mg under ambient conditions to form NaBH 4 in high yield (close to 80 %). Compared with previous studies, this approach avoids expensive reducing agents such as MgH 2 , bypasses the energy‐intensive dehydration procedure to remove water from Na 2 B 4 O 7 ⋅10 H 2 O, and does not require high‐pressure H 2 gas, therefore leading to much reduced costs. This method is expected to effectively close the loop of NaBH 4 regeneration and hydrolysis, enabling a wide deployment of NaBH 4 for hydrogen storage.