Mechanism of the cathode process in the electrochemical synthesis of TiB2 in molten salts—I. The synthesis in an all-fluoride electrolyte
Mechanism of the cathode process in the electrochemical synthesis of TiB2 in molten salts—I. The synthesis in an all-fluoride electrolyte
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DOI：
10.1016/0013-4686(89)87120-8
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发表时间：
1989-06
影响因子：
6.6
通讯作者：
M. Makyta;K. Matiašovský;V. Taranenko
中科院分区：
文献类型：
--
作者：
M. Makyta;K. Matiašovský;V. Taranenko
本文用线性伏安法和循环伏安法研究了以六氟钛酸钾和四氟硼酸钾为电化学活性组分的LiF ∶ KF支持电解质中二硼化钛电化学合成的阴极过程机理。结果表明，在LiF <$KF <$K2TiF6 <$KBF 4体系中，Ti（IV）的还原分两步进行：Ti（IV）→Ti（III）→Ti（在TiB 2中）。第一步之后是将B（III）还原成元素硼，元素硼与通过从Ti（III）去极化而还原的钛反应，形成TiB 2。去极化可以通过TiB 2生成吉布斯能的高负值来解释。
The mechanism of the cathode process in the electrochemical synthesis of titanium diboride in molten LiFKF supporting electrolyte containing potassium hexafluorotitanate and tetrafluoroborate as electrochemically active components has been determined by means of linear and cyclic voltammetry. It was found that the reduction of Ti(IV) in the system LiFKFK2TiF6KBF4proceeds in two steps: Ti(IV)→Ti(III)→Ti (in TiB2). The first step is followed by the reduction of B(III) to elementary boron which reacts with titanium reduced with depolarization from Ti(III) under formation of TiB2. The depolarization can be explained by the high negative value of the Gibbs energy of formation of TiB2.