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A Review of Electrochemical Reduction of Sodium Metaborate

Author

Listed:
  • 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)

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.

Suggested Citation

  • Wan Jefrey Basirun & Syed Tawab Shah & Md. Shalauddin & Shamima Akhter & Nazzatush Shimar Jamaludin & Adeeb Hayyan, 2022. "A Review of Electrochemical Reduction of Sodium Metaborate," Energies, MDPI, vol. 16(1), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:15-:d:1009071
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