Electrochemical mechanism and kinetics of electrodissolution-coupled hafnium alkoxide synthesis in tetraethylammonium-chloride-based anhydrous system
- 点击次数：
- 影响因子：4.7
- DOI码：10.1016/S1003-6326(24)66499-X
- 发表刊物：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
- 关键字：Hafnium alkoxide synthesis;
Tetraethylammonium chloride;
Hafnium dissolution;
Ethanol dehydrogenation;
Electrochemical mechanism;
Electrochemical impedance spectroscopy (EIS);
Micro-kinetics modelling
- 摘要：Electrodissolution-coupled hafnium alkoxide synthesis (EHS) is a promising pathway for efficient electrosynthesis. It employs simultaneous heterogeneous reactions of Hf dissolution and ethanol dehydrogenation, and spontaneous solution-based combination reaction between Hf4+ 4+ cations and alkoxy anions. To elucidate the mechanism and kinetics of EHS process, the electrochemical behaviors of anodic Hf dissolution and cathodic ethanol dehydrogenation were explored through electrochemical measurements, SEM observations, gas chromatography, and micro-kinetics modeling. The results indicated the supporting electrolytes of tetraethylammonium chloride (Et4NCl) 4 NCl) to be preferable, which facilitated a passive-film-punctured pitting mechanism for Hf dissolution and a two-stage dehydrogenation mechanism. Three indicators related to passive rate, sensitivity towards puncture of the passive film, and pitting rate were extracted to quantify the kinetics of passive puncture and Hf corrosion. Micro-kinetics models were developed to evaluate the Et4NCl-based 4 NCl-based EHS process, which achieved electric energy requirements of 1.53-1.83 kWh/kg Hf(OC2H5)4. 2H5)4 .
- 论文类型：期刊论文
- 学科门类：工学
- 一级学科：冶金工程
- 文献类型：J
- 卷号：34
- 期号：5
- 页面范围：1681-1693
- 是否译文：否
- 发表时间：2024-05-01
- 收录刊物：SCI、EI、SSCI
