| XU Yang-tao,HUANG Kai,ZHU Zhen-xu.EQCM of Nickel Cathode Deposition and Anode Dissolution in Industrial Electrolyte[J],48(9):293-299 |
| EQCM of Nickel Cathode Deposition and Anode Dissolution in Industrial Electrolyte |
| Received:February 20, 2019 Revised:September 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.09.035 |
| KeyWord:nickel electrolyte electrical crystallization cathodic deposition anodic dissolution EQCM nickel plating nickel electrolysis |
| Author | Institution |
| XU Yang-tao |
1.a. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal under the Province and the Ministry of Education, b. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou , China; 2.State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchang , China |
| HUANG Kai |
1.a. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal under the Province and the Ministry of Education, b. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou , China; 2.State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchang , China |
| ZHU Zhen-xu |
1.a. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal under the Province and the Ministry of Education, b. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou , China; 2.State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchang , China |
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| Abstract: |
| The work aims to study the cathode deposition and anode dissolution of Ni in industrial electrolyte through the change of electrode mass and investigate the effect of temperature on this process. Cyclic voltammetry (CV) was used to study the cathodic deposition and anodic dissolution process of nickel on gold electrodes in industrial electrolytes of nickel sulfide soluble anode/mixed acid system and the effect of temperature on this process. Electrochemical quartz crystal microbalance (EQCM) was applied to monitor the frequency on electrode surface during this process in real time. At the same time, the electrode process in different potential range was analyzed according to M/n determined by experiment. When the electrolyte temperature was 30 ℃, the M/n values of the I and II deposition zones were 30.8 and 29.3 g/mol, respectively, and the M/n values of the III-1 and III-2 dissolution zones were 30.7 and 29.4 g/mol, respectively. After the experiment temperature was changed to 20 ℃, cyclic voltammetry could not be conducted. When the temperature of the electrolyte was gradually increased from 25 ℃ to 30 ℃ and 35 ℃, the M/n values of the deposition peaks were 30.3, 30.9 and 26.3 g/mol, respectively, As the temperature increased, the initial deposition potential of nickel was positively shifted. During cathode deposition, the mass of nickel disposition layer on electrode surface gradually increased with the increasing temperature. After anode dissolution, the mass of nickel disposition layer on electrode surface gradually decreased. Metal ions (Co2+, Cu2+) close to the nickel ion in deposition potential will co-deposit with Ni2+, and types tend to be complicated with increasing temperature. Properly increasing the temperature of the electrolyte not only facilitates the deposition of nickel, but also promotes the appearance of nucleation rings and dissolution peaks in CV curves. Besides, the deposition with loose structure and soluble properties can be formed. The change in the direction of potential scanning in the CV curve results in the change in the structure of nickel deposit layer during the deposition process at –1.4 V, thus causing stratified dissolution in the dissolution process, and the stratified dissolution in the dissolution process becomes more obvious with the increase of temperature. |
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