A Review of Electrochemical Reduction of Sodium Metaborate

Wan Jefrey Basirun (), Syed Tawab Shah, Md. Shalauddin, Shamima Akhter, Nazzatush Shimar Jamaludin and Adeeb Hayyan
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Wan Jefrey Basirun: Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
Syed Tawab Shah: Nanotechnology and Catalysis Research Center (NanoCat), University Malaya, Kuala Lumpur 50603, Malaysia
Md. Shalauddin: Nanotechnology and Catalysis Research Center (NanoCat), University Malaya, Kuala Lumpur 50603, Malaysia
Shamima Akhter: Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
Nazzatush Shimar Jamaludin: Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
Adeeb Hayyan: Department of Chemical Engineering, Faculty of Engineering, University Malaya, Kuala Lumpur 50603, Malaysia

Energies, 2022, vol. 16, issue 1, 1-15

Abstract: The recycling of sodium borohydride poses a huge challenge to the drive towards a hydrogen economy. Currently, mechano-chemical, thermo-chemical and electrochemical are the only reported methods of recycling sodium metaborate into sodium borohydride. Much attention has been devoted to the mechano-chemical and thermo-chemical methods of reduction, but little focus has been devoted to electrochemical methods. This review describes the electrochemical behaviour of borohydride (BH 4 − ) and metaborate (BO 2 − ) anions in alkaline solutions. The BH 4 − is stabilized in highly concentrated alkaline solutions, while the electro-oxidation of BH 4 − is dependent on the type of electrode material. The attempts to electro-reduce the BO 2 − into BH 4 − is reviewed and the challenges, suggestions and future outlook of electro-reduction for the recycling of BO 2 − into BH 4 − is highlighted.

Keywords: sodium metaborate; sodium borohydride; electro-reduction; electro-synthesis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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