1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究

doi:10.13208/j.electrochem.161053

电化学（中英文） ›› 2017, Vol. 23 ›› Issue (3): 332-339. doi: 10.13208/j.electrochem.161053

• 有机电化学及电化学工业近期研究专辑（华东理工大学张新胜教授、北京化工大学曾程初教授主编） • 上一篇下一篇

1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究

罗维¹，钮东方¹，杜荣斌²，王钧伟²，汪竹青²，徐衡²，张新胜^1*

1.华东理工大学化学工程国家重点实验室，上海200237；2. 石油化工新材料协同创新中心，安徽安庆 246011

收稿日期:2016-11-25 修回日期:2017-02-07 出版日期:2017-06-29 发布日期:2017-03-01
通讯作者: 张新胜 E-mail:xszhang@ecust.edu.cn
基金资助:
安徽省石油化工新材料协同创新中心资助

Electrochemical Deposition of Cr from Cr³⁺ in the Mixed Electrolyte of [BMIM]OAc/H₂O

LUO Wei¹, NIU Dong-fang¹, DU Rong-bin², WANG Jun-wei², WANG Zhu-qing², XU Heng², ZHANG Xin-sheng^1*

1.State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2. Collaborative Innovation Center for Petrochemical New Materials, Anqing 246011, Anhui, China

Received:2016-11-25 Revised:2017-02-07 Published:2017-06-29 Online:2017-03-01
Contact: ZHANG Xin-sheng E-mail:xszhang@ecust.edu.cn

摘要/Abstract

摘要：

本文在[BMIM]OAc-H₂O电解液中研究了Cr³⁺的电沉积反应. 经循环伏安研究表明, Cr³⁺的还原属于受扩散控制的分步还原过程, 即Cr³⁺ + e → Cr²⁺和Cr²⁺ + 2e → Cr⁰. 在40℃下通过Rendle-Sevcik方程计算得到Cr³⁺的扩散系数为1.2×10^-8 cm²/s. 采用计时电流法探讨了Cr的三维瞬时成核机理. 对沉积的铬镀层进行了XRD、SEM表征, 结果表明经600℃氩气保护下煅烧后的镀层由Cr和Cr₂O₃纳米球状颗粒聚集而成, 其平均粒径为0.48μm. 对40℃，-3.0V条件下所得镀层进行EDX检测，发现Cr与O的能级峰十分明显，其中Cr的质量分数为83.8%. 通过在[BMIM]OAc、[BMIM]BF₄和[BMIM]PF₆三种离子液体体系中电镀得到的Cr镀层质量的比较, 表明OAc-的确有利于Cr的电沉积.

关键词: 电沉积, 1-丁基-3-甲基咪唑乙酸盐, 三价铬, 铬镀层

Abstract:

The electrochemical reduction of trivalent chromium ion (Cr³⁺) to Cr in 1-butyl-3-methylimidazolium acetate ([BMIM]OAc)-H₂O mixed electrolyte was investigated. The cyclic voltammograms showed that the electroreduction of Cr³⁺ in the mixed electrolyte occurred in a two-step process, namely, Cr³⁺+ e → Cr²⁺ and Cr²⁺+ 2e→ Cr⁰, controlled by the diffusion of Cr³⁺to the electrode. The diffusion coefficient of Cr³⁺ was 1.2×10^-8cm²/s at 40 ℃ obtained by Rendle-Sevcik equation. The chronoamperomograms of the Cr³⁺electrodeposition confirmed the three-dimensional instantaneous nucleation mechanism of Cr. The XRD and SEM characterizations on the Cr coating after calcining in argon atmosphere at 600℃ revealed that the coating was composed of Cr and chromium oxide (Cr₂O₃) nanoparticles with an average particle size of 0.48 μm. The elements of Cr and O were obviously detected from the coating obtained at 40℃ and -3.0V by EDX and the mass fraction of Cr reached 83.8%. Comparison in the qualities of coating layers prepared by Cr electrodepositions in [BMIM]OAc, [BMIM]BF₄and [BMIM]PF₆ electrolytes indicated that the OAc^- was presented in favor of Cr³⁺ reduction.

Key words: electrodeposition, 1-butyl-3-methylimidazolium acetate, trivalent chromium ion, Cr coating

中图分类号:

O646

罗维，钮东方，杜荣斌，王钧伟，汪竹青，徐衡，张新胜. 1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究[J]. 电化学（中英文）, 2017, 23(3): 332-339.

LUO Wei, NIU Dong-fang, DU Rong-bin, WANG Jun-wei, WANG Zhu-qing, XU Heng, ZHANG Xin-sheng. Electrochemical Deposition of Cr from Cr³⁺ in the Mixed Electrolyte of [BMIM]OAc/H₂O[J]. Journal of Electrochemistry, 2017, 23(3): 332-339.

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https://electrochem.xmu.edu.cn/CN/Y2017/V23/I3/332

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1-丁基-3-甲基咪唑醋酸盐和水组成的混合电解液中三价铬电沉积铬的研究

Electrochemical Deposition of Cr from Cr³⁺ in the Mixed Electrolyte of [BMIM]OAc/H₂O

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Electrochemical Deposition of Cr from Cr³⁺ in the Mixed Electrolyte of [BMIM]OAc/H₂O