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Efficient Synthesis of Sodium Borohydride: Balancing Reducing Agents with Intrinsic Hydrogen Source in Hydrated Borax
Zhu,Yongyang1; Ouyang,Liuzhang1,2; Zhong,Hao1; Liu,Jiangwen1; Wang,Hui1; Shao,Huaiyu3; Huang,Zhenguo4; Zhu,Min1
2020-09-08
Source PublicationACS Sustainable Chemistry and Engineering
Volume8Issue:35Pages:13449-13458
AbstractSodium borohydride (NaBH4) has been identified as one of the most promising hydrogen storage materials; however, it is still challenging to produce NaBH4 with low cost and high efficiency, which are largely determined by the sources of boron and hydrogen and reducing agents used. Herein, we report an economical method to produce NaBH4 by ball milling hydrated borax (Na2B4O7·10H2O and/or Na2B4O7·5H2O) with different reducing agents such as MgH2, Mg, and NaH under ambient conditions. The direct use of natural hydrated borax avoids the dehydration process (at 600 °C) and consequently reduces cost and improves overall energy efficiency. A high yield of 93.1% can be achieved for a short ball mill duration (3.5 h) for Na2B4O7·5H2O-NaH-MgH2 system. In this system, H2 is generated in situ which subsequently reacts with Mg forming MgH2. Low cost Mg is therefore employed to replace the majority of MgH2, leading to an attractive yield of 78.6%. To further reduce the cost of raw materials and improve the utilization of hydrogen source in the hydrated borax, Na2B4O7·10H2O is used to partially substitute for Na2B4O7·5H2O, leading to a complete replacement of MgH2. Compared with literature results, the optimized recipe features low cost and high efficiency since it utilizes hydrogen from the hydrated water in natural borax and avoids high temperatures. Our finding is expected to facilitate applications of NaBH4 for hydrogen storage.
KeywordBorax Chemical synthesis Hydrogen Hydrogen storage Metal hydrides Sodium borohydride
DOI10.1021/acssuschemeng.0c04354
URLView the original
Language英语
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Cited Times [WOS]:1   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorOuyang,Liuzhang
Affiliation1.School of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials,South China University of Technology,Guangzhou,510641,China
2.China-Australia Joint Laboratory for Energy and Environmental Materials,Key Laboratory of Fuel Cell Technology of Guangdong Province,Guangzhou,510641,China
3.Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering (IAPME),Department of Physics and Chemistry,Faculty of Science and Technology,University of Macau,SAR,Macao
4.School of Civil and Environmental Engineering,University of Technology Sydney,Sydney,2007,Australia
Recommended Citation
GB/T 7714
Zhu,Yongyang,Ouyang,Liuzhang,Zhong,Hao,et al. Efficient Synthesis of Sodium Borohydride: Balancing Reducing Agents with Intrinsic Hydrogen Source in Hydrated Borax[J]. ACS Sustainable Chemistry and Engineering,2020,8(35):13449-13458.
APA Zhu,Yongyang,Ouyang,Liuzhang,Zhong,Hao,Liu,Jiangwen,Wang,Hui,Shao,Huaiyu,Huang,Zhenguo,&Zhu,Min.(2020).Efficient Synthesis of Sodium Borohydride: Balancing Reducing Agents with Intrinsic Hydrogen Source in Hydrated Borax.ACS Sustainable Chemistry and Engineering,8(35),13449-13458.
MLA Zhu,Yongyang,et al."Efficient Synthesis of Sodium Borohydride: Balancing Reducing Agents with Intrinsic Hydrogen Source in Hydrated Borax".ACS Sustainable Chemistry and Engineering 8.35(2020):13449-13458.
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