A review of electrochemical reduction of sodium metaborate

Document Type

Article

Publication Date

1-1-2023

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 (BH4-) and metaborate (BO2-) anions in alkaline solutions. The BH4- is stabilized in highly concentrated alkaline solutions, while the electro-oxidation of BH4- is dependent on the type of electrode material. The attempts to electro-reduce the BO2- into BH4- is reviewed and the challenges, suggestions and future outlook of electro-reduction for the recycling of BO2- into BH4- is highlighted.

Keywords

Sodium metaborate, Sodium borohydride, Electro-reduction, Electro-synthesis

Publication Title

Energies

Divisions

sch_che,CHEMISTRY,nanocat

Funders

Universiti Malaya (Grant No: PPSI-2020-CLUSTER-IDIG04)

Volume

16

Issue

1

Publisher

MDPI

Publisher Location

ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND

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