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Inorganic Chemistry Frontiers · 2021 ·Vol. 9 ·期 2 ·370-378 · IF 6.569

Synthesis of NaBH4 as a hydrogen carrier from hydrated borax using a Mg–Al alloy

Yongyang Zhu,Hao Zhong,Liuzhang Ouyang,Jiangwen Liu,Hui Wang,Huaiyu Shao,Min Zhu

In this work, we reported an energy-saving and cost-efficient process for the (re)generation of NaBH4 by ball milling hydrated borax (Na2B4O7·10H2O) with a Mg–Al alloy under ambient conditions. The introduction of abundant and readily available Al can increase air stability of the reducing agent. A high yield up to 85.2% could be achieved by using Mg17Al12 because of its hardness and brittleness.

CAS / MDL: 7681-11-0 7758-05-6 7772-98-7 9005-84-9 1310-73-2 1303-96-4 7664-93-9

研究领域: 材料科学 · 能源化学

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Journal of Materials Chemistry A · 2019 ·Vol. 7 ·期 17 ·10723-10728 · IF 10.733

Realizing facile regeneration of spent NaBH4 with Mg–Al alloy

Hao Zhong,Liuzhang Ouyang,Meiqin Zeng,Jiangwen Liu,Hui Wang,Huaiyu Shao,Michael Felderhoff,Min Zhu

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.

CAS / MDL: 10102-17-7 7758-05-6 9005-84-9 1310-73-2 7664-93-9

研究领域: 化学工程 · 能源材料科学

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Synthesis of NaBH4 as a hydrogen carrier from hydrated borax using a Mg–Al alloy

Realizing facile regeneration of spent NaBH4 with Mg–Al alloy