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The mechanisms of the electrochemical reduction and nucleation process of B(Ⅲ) on the platinum electrode in the LiF-NaF-KF-KBF4 molten salt at 700℃ were first investigated using cyclic voltammetry and chronoamperometry techniques.It was found that the electrochemical reduction of B(Ⅲ) occurs in single-step charge transfer: B(Ⅲ) + 3e → B,and the cathode process is reversible.The electrocrystallization process of B(Ⅲ) is instantaneous.