• 综合
  • 标题
  • 关键词
  • 摘要
  • 学者
  • 期刊-刊名
  • 期刊-ISSN
  • 会议名称
搜索

作者:

Xi, Xiaoli (Xi, Xiaoli.) (学者:席晓丽) | Si, Guanhao (Si, Guanhao.) | Nie, Zuoren (Nie, Zuoren.) (学者:聂祚仁) | Ma, Liwen (Ma, Liwen.)

收录:

EI Scopus SCIE

摘要:

This paper presents a novel method of electrochemical extraction of tungsten from tungsten carbide (WC) scrap in the molten NaCl-KCl salt. WC was used as a consumable anode and dissolved electrochemically to extract tungsten at 1023 K. In this method, the kinetics of the WC anode was analyzed through linear polarization and electrochemical impedance spectroscopy (EIS). Electrochemical techniques, such as cyclic voltammetry (CV), chronopotentiometry (CP), square wave voltammetry (SWV), and chronoamperometry, were employed to investigate the electrochemical behavior of tungsten ions derived from the WC anode in the melt. Results confirmed that the redox reaction of tungsten on a platinum working electrode is reversible; this reaction was controlled through tungsten ion diffusion in the electrolyte. During reduction, a stable electro-active species was detected through CP and SWV. Electrochemical reduction of tungsten ions proceeded in one step with two exchanged electrons. The nucleation mode of tungsten deposition was also determined. Chronoamperometry results revealed that electro-deposition follows progressive nucleation with a three-dimensional nuclei growth. After galvanostatic electrolysis, the deposition was analyzed through X-ray diffraction and scanning electron microscopy. Results verified the formation of pure tungsten powders with a diameter of <100 nm at a cathodic current density of 0.125 A cm(-2). (C) 2015 Elsevier Ltd. All rights reserved.

关键词:

electrochemical behavior molten chloride tungsten WC scrap

作者机构:

  • [ 1 ] [Xi, Xiaoli]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Si, Guanhao]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Nie, Zuoren]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Ma, Liwen]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

通讯作者信息:

  • 聂祚仁

    [Nie, Zuoren]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

电子邮件地址:

查看成果更多字段

相关关键词:

来源 :

ELECTROCHIMICA ACTA

ISSN: 0013-4686

年份: 2015

卷: 184

页码: 233-238

6 . 6 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:179

JCR分区:1

中科院分区:2

被引次数:

WoS核心集被引频次: 34

SCOPUS被引频次: 35

ESI高被引论文在榜: 0 展开所有

万方被引频次:

中文被引频次:

近30日浏览量: 3

在线人数/总访问数:4204/2948656
地址:北京工业大学图书馆(北京市朝阳区平乐园100号 邮编:100124) 联系我们:010-67392185
版权所有:北京工业大学图书馆 站点建设与维护:北京爱琴海乐之技术有限公司