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Electrosynthesis of NaBH4 from NaBO2 for Hydrogen Storage

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Abstract:

Sodium borohydride (NaBH4) has several advantages as a hydrogen storage material compared to other hydrogen storage materials, such as metal hydrides, porous carbon, or other complex compounds. These advantages include a high storage capacity, the ability to release hydrogen under mild conditions, good chemical and thermal stability, and being non-toxic and environmentally friendly. These advantages make NaBH4 the leading choice for hydrogen storage. In some of our previous investigations, we have studied the electrochemical release of hydrogen from NaBH4, resulting in the formation of NaBO2. The next problem is how to recover NaBO2 to convert it back into NaBH4. The method developed in this study is an electrochemical method with advantages in process control and scalability. This paper aims to convert NaBO2 back into NaBH4 electrochemically. The electrosynthesis of NaBH4 from NaBO2 was carried out in a two-chamber electrochemical cell separated by a bipolar membrane. The power supply controlled the current. The current used varied from 0.5 to 2 A. The concentration of NaBH4 formed was analyzed using the iodate titration method. The formation of NaBH4 occurs in the cathode chamber. The concentration of NaBH4 increases with increasing electrolysis time. In general, the reaction rate of NaBH4 formation increases at a current of 2 A. Meanwhile, the reaction rate of NaBH4 formation at currents of 0.5 A and 1 A is almost the same. The greater the current used, the faster the NaBO2 reduction process in the cathode chamber. The integral analysis method calculates the reaction order by integrating the reaction rate equation. The reaction orders tested are zero order, 1st order, and 2nd order. The best curve-matching results are shown in the second-order reaction rate equation. At a current of 2 A, the comparison curve between the data and the equation still indicates a relatively low fit. However, the second-order reaction rate equation gives the best results. The reaction rate constant is between 0.0406 and 0.0472 L mol-1s-1.

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Periodical:

Applied Mechanics and Materials (Volume 931)

Pages:

87-94

DOI:

https://doi.org/10.4028/p-Or6wrx

Citation:

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Online since:

February 2026

Authors:

Adrian Nur*, Arif Jumari, Endah Retno Dyartanti, Muhammad Dani Supardan, Nazriati Nazriati, Faza Yusuf Arrazy, Rizal Noor Said, Cavin Muhammad Putra Pradana, Rosyid Dicky Bayu Saputra

Keywords:

Electrochemistry, Hydrogen, Sodium Borohydride, Sodium Metaborate, Synthesis

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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