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Realizing Facile Regeneration of Spent NaBH4 with Mg-Al Alloy
Hao Zhong1; Liuzhang Ouyang1,2; Meiqin Zeng1; Jiangwen Liu1; Hui Wang1; Huaiyu Shao3; Michael Felderhoff4; Min Zhu1
2019
Source PublicationJournal of Materials Chemistry A
ISSN2050-7488
Abstract

The regeneration of sodium borohydride (NaBH4) is crucial to form a closed cycle after it either supplies hydrogen energy via a hydrolysis process or provides energy through electron transfer at the anode of direct borohydride fuel cells (DBFCs). In both of these cases, the spent fuels are NaB(OH)4 from NaBO2 aqueous solution. However, the current regeneration process from (NaB(OH)4)$xH2O to form NaBH4 by reduction reaction and calcination at high temperature with metal hydrides as reducing agents is very expensive. In this work, we developed a simple regeneration process via ball milling with Mg–Al alloys as the reducing agent for NaB(OH)4 under an argon atmosphere. Under optimized conditions, a high yield of about 72% of NaBH4 could be obtained. Mechanistic study showed that all the hydrogen atoms from NaB(OH)4 remain in NaBH4 and no additional hydrogen sources are needed for the reduction process. The inexpensive Mg–Al alloy works as a reducing agent transforming the H+ to H in NaBH4. This approach demonstrates a 20-fold cost reduction compared with the method using metal hydrides. This opens the door to the commercial implementation of simple ball milling processes for the regeneration of spent NaBH4 from NaB(OH)4 with cheap reducing agents.

DOIhttp://doi.org/10.1039/C9TA00769E
Language英语
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Document TypeJournal article
CollectionFaculty of Science and Technology
INSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Corresponding AuthorLiuzhang Ouyang; Huaiyu Shao; Michael Felderhoff
Affiliation1.School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, People's Republic of China
2.China-Australia Joint Laboratory for Energy & Environmental Materials, Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510641, People's Republic of China
3.Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, Macau SAR, China
4.Max-Planck-Institut fur Kohlenforschung, 45470 M ¨ ulheim an der Ruhr, Germany
Corresponding Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Recommended Citation
GB/T 7714
Hao Zhong,Liuzhang Ouyang,Meiqin Zeng,et al. Realizing Facile Regeneration of Spent NaBH4 with Mg-Al Alloy[J]. Journal of Materials Chemistry A,2019.
APA Hao Zhong.,Liuzhang Ouyang.,Meiqin Zeng.,Jiangwen Liu.,Hui Wang.,...&Min Zhu.(2019).Realizing Facile Regeneration of Spent NaBH4 with Mg-Al Alloy.Journal of Materials Chemistry A.
MLA Hao Zhong,et al."Realizing Facile Regeneration of Spent NaBH4 with Mg-Al Alloy".Journal of Materials Chemistry A (2019).
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