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 1.2×10-8 cm2/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]BF4 and [BMIM]PF6 electrolytes indicated that the OAc- was presented in favor of Cr3+ reduction.
Graphical Abstract
Keywords
electrodeposition, 1-butyl-3-methylimidazolium acetate, trivalent chromium ion, Cr coating
Publication Date
2017-06-29
Online Available Date
2017-03-01
Revised Date
2017-02-07
Received Date
2016-11-25
Recommended Citation
Wei LUO, Dong-fang NIU, Rong-bin DU, Jun-wei WANG, Zhu-qing WANG, Heng XU, Xin-sheng ZHANG.
Electrochemical Deposition of Cr from Cr3+ in the Mixed Electrolyte of [BMIM]OAc/H2O[J]. Journal of Electrochemistry,
2017
,
23(3): 332-339.
DOI: 10.13208/j.electrochem.161053
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol23/iss3/10
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