| LI Meng-qing,CUI Wei-wei,BAI Zi-long,XU Yin-xing,YU Hui-zhu,LI Rui-qian.One-step Electrodeposition and Performance of Superhydrophobic Structure from Deep Eutectic Solvent[J],52(9):331-339 |
| One-step Electrodeposition and Performance of Superhydrophobic Structure from Deep Eutectic Solvent |
| Received:July 05, 2022 Revised:November 25, 2022 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.029 |
| KeyWord:deep eutectic solvent electrodeposition nickel stearate micro/nano hierarchical structure superhydrophobicity corrosion resistance self-cleaning |
| Author | Institution |
| LI Meng-qing |
School of Chemistry and Materials Engineering, Fuyang Normal University, Anhui Fuyang , China |
| CUI Wei-wei |
School of Chemistry and Materials Engineering, Fuyang Normal University, Anhui Fuyang , China |
| BAI Zi-long |
School of Chemistry and Materials Engineering, Fuyang Normal University, Anhui Fuyang , China |
| XU Yin-xing |
School of Chemistry and Materials Engineering, Fuyang Normal University, Anhui Fuyang , China |
| YU Hui-zhu |
School of Chemistry and Materials Engineering, Fuyang Normal University, Anhui Fuyang , China |
| LI Rui-qian |
School of Chemistry and Materials Engineering, Fuyang Normal University, Anhui Fuyang , China;Engineering Research Centre of Biomass Conversion and Pollution Prevention Control of Anhui Provincial Department of Education, Anhui Fuyang , China |
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| Abstract: |
| In this work, a template free one-step electrodeposition method in deep eutectic solvent (DES) was reported for the preparation of hierarchical structured superhydrophobic surface with excellent chemical stability, corrosion resistance and self-cleaning properties. It is well known that, surface hierarchical structures and surface free energy are the main factors for preparation of superhydrophobic surfaces. To fabricate the superhydrophobic surface with micro/nano hierarchical structures by one-step electrodeposition, in this paper, the choline chloride-urea deep eutectic solvent (ChCl-Urea DES) containing 0.04 mol/L NiCl2.6H2O and 0.1 mol/L stearic acid was used as electrolyte. A series of nickel stearate (Ni[CH3(CH2)16COO]2) coatings with different surface morphologies were obtained on the copper substrate by regulating the electrodeposition time (These coatings were named NS-1, NS-2 and NS-3 based on the deposition time, respectively). The surface morphology and chemical composition of the as-prepared coatings were characterized by a scanning electron microscope (SEM), an X-ray energy dispersive spectroscopy (EDS), a Fourier-transform infrared spectroscopy (FT-IR) and an X-ray photoelectron spectroscopy (XPS). The water contact angles, chemical stability, corrosion resistance and self-cleaning of the as-prepared coatings were investigated by a water contact angle measurement and electrochemical workstation. The results showed that the component of the as-prepared coatings was nickel stearate, and the surface morphologies of the coatings were closely correlated with the deposition time. In the initial stage, nickel ions (Ni2+) reacted with stearate ions (CH3(CH2)16COO−) to form nano sheet-shape nickel stearate on the surface of copper substrate. As the deposition time increased, the nano sheets gradually increased and interconnected each other, eventually formed micro-scale flower-like structures. So, the surface morphology of nickel stearate changed from uniform nano sheets (10 min) to scattered flower-like structures (30 min), and finally to uniform and dense flower-like structures (50 min). The wetability test showed that the water contact angle (θWCA) of NS-1 with nano sheet-like structures was only about (130.7±2.2)°. The θWCA of scattered flower-like NS-2 was improved to (147.8±2.5)° due to the increase of surface roughness. The NS-3 exhibited desirable superhydrophobicity with a θWCA of (157.3±1.9)° and a θSA of (3.6±1.1)° when the surface was covered by uniform and dense hierarchical micro/nano-scaled flower-like structures. Furthermore, different kinds of droplets (such as tea, methylene blue solution, methyl orange solution, milk, NaCl solution and coke) on NS-3 surface maintained a spherical shape with the WCAs ranging between 154.3° and 156.5°, indicating that the NS-3 surface had excellent superhydrophobicity and antifouling properties. Clearly, the coarse hierarchical structure had a better ability to trap a large amount of air and improve the superhydrophobicity compared with the nano sheet-like structure. The stability test found that WCA of the superhydrophobic NS-3 coating maintained larger than 152.1° and the RAs values maintained lower than 7° when the pH values ranged from 1 to 14, indicating that pH had little effect on the WCAs. The NS-3 coating still possessed good superhydrophobic performance with a WCA of 151.8° after soaking for 8 days in 3.5wt.% NaCl solution. These phenomena indicated that the superhydrophobic NS-3 coating had outstanding chemical stability. Tafel tests showed that the Jcorr of NS-3 superhydrophobic surface were 1.75×10−6 A/cm2, which was decreased about 7 and 20 times, respectively, in comparison with NS-2 and NS-1. For the self-cleaning test, the spherical droplets quickly rolled off and took away the surface contaminants (such as graphite powder, SiO2 powder and SiC powder). It could be anticipated that the micro/nano hierarchical structured NS-3 showed excellent superhydrophobicity, self-cleaning, chemical stability and corrosion resistance. Using deep eutectic solvent as the electrolyte provides a promising method to fabricate micro/nano hierarchical structured superhydrophobic surface by one-step electrodeposition method. |
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