Effect of allyl thiourea on nickel electrodeposition from solution containing ammonia and chloride

Authors

Ya-ning HE, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Huanan,China;
Liang YUAN, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Huanan,China;
Zhi-ying DING, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Huanan,China;
Shi-jun LIU, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Huanan,China;Follow

Corresponding Author

Shi-jun LIU(shijunliu@csu.edu.cn)

Abstract

The effects of allylthiourea (ATU) concentration on the cathodic polarization behaviour, nucleation and surface morphology of nickel electrodeposited on the glassy carbon electrode from ammonia-ammonium chloride-water (NH₃-NH₄Cl-H₂O) solutions were investigated by cyclic voltammogry, cathodic polarization and current transient methods. The results revealed that the addition of ATU inhibited nickel deposition, which was enhanced with an increase in ATU concentration from 5 to 50 mg•L^-1. The initial deposition kinetics corresponded to a model including instantaneous nucleation and diffusion controlled growth. In the presence of ATU, the initial nucleation of nickel electrocrystallisation remained unchanged. However, the number density of nuclei increased and the crystal growth rate decreased. Furthermore, the addition of ATU apparently made the grains finer, leading to the formation of a more compact and uniform nickel deposit as compared with that without ATU.

Graphical Abstract

Keywords

nickel electrodeposition, NH3-NH4Cl-H2O solution, allyl thiourea, additive

DOI Link

https://doi.org/10.13208/j.electrochem.161217

Publication Date

2017-12-28

Online Available Date

2017-02-13

Revised Date

2017-01-26

Received Date

2016-12-20

Recommended Citation

Ya-ning HE, Liang YUAN, Zhi-ying DING, Shi-jun LIU. Effect of allyl thiourea on nickel electrodeposition from solution containing ammonia and chloride[J]. Journal of Electrochemistry, 2017 , 23(6): 638-644.
DOI: 10.13208/j.electrochem.161217
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss6/3