A Review of Electrochemical Reduction of Sodium Metaborate

The recycling of sodium borohydride poses a huge challenge to the drive towards hydrogen economy. Currently, mechano-chemical, thermo-chemical and electrochemical are only reported methods metaborate into borohydride. Much attention has been devoted mechano-chemical reduction, but little focus methods. This review describes behaviour (BH4−) (BO2−) anions in alkaline solutions. BH4− is stabilized highly concentrated solutions, while electro-oxidation dependent on type electrode material. attempts electro-reduce BO2− reviewed challenges, suggestions future outlook electro-reduction for highlighted.