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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

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Front. Mater. Sci.    2021, Vol. 15 Issue (4) : 601-610    https://doi.org/10.1007/s11706-021-0575-3
RESEARCH ARTICLE
Hydrophobic organic coating based water--solid TENG for water-flow energy collection and self-powered cathodic protection
Yupeng LIU1,3, Guoyun SUN2,3, Ying LIU2(), Weixiang SUN3,4, Daoai WANG1,3()
1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
3. Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China
4. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266100, China
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Abstract

Water–solid triboelectric nanogenerators (TENGs), as new energy collection devices, have attracted increasing attention in ocean energy harvesting and self-powered sensing. Polyacrylic acid (PAA) coating, usually used on the surface of marine equipment, has the property of anti-aging and anti-wear but limits triboelectrical output when used with TENGs. In this paper, polyacrylic acid coating was modified with fluorinated polyacrylate resin (F-PAA) to increase its triboelectrical output, by 6 times, and also to increase its anti-corrosion property. In addition, the corrosion resistance property can be further enhanced by cathodic protection using the electrical output generated by the water-flow triboelectrical energy transfer process. Given their easy fabrication, water-flow energy harvesting, and corrosion resistance, PAA/F-PAA coating-based TENGs have promising applications in river and ocean energy collection and corrosion protection.
Keywords TENG      hydrophobic coating      energy collection      anticorrosion      cathodic protection     
Corresponding Author(s): Ying LIU,Daoai WANG   
Online First Date: 10 November 2021    Issue Date: 28 December 2021
 Cite this article:   
Yupeng LIU,Guoyun SUN,Ying LIU, et al. Hydrophobic organic coating based water--solid TENG for water-flow energy collection and self-powered cathodic protection[J]. Front. Mater. Sci., 2021, 15(4): 601-610.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-021-0575-3
https://academic.hep.com.cn/foms/EN/Y2021/V15/I4/601
Fig.1  (a) Synthesis and structure of fluorinated polyacrylate resin (F-PAA). (b) Elemental analyses and water contact angle of the surface of PAA/F-PAA coating. (c) Schematic diagram of PAA/F-PAA coating-based TENG device.
Fig.2  (a) Position of the prepared coatings in the triboelectric sequence with PET, PI, PVDF, and PTFE (friction with water). (b) Schematic representation of the triboelectrification process.
Fig.3  (a)Isc of PAA coating-based TENG and PAA/F-PAA coating-based TENG. (b)Voc and (c) transferred charge of PAA coating-based TENG and PAA/F-PAA coating-based TENG. (d) Output stability of PAA/F-PAA coating-based TENG with 10000 cycles.
Fig.4  (a)Isc, (b)Voc, and (c) water droplet contact angles of coatings with different mass ratios of F-PAA to PAA, and (d) the influence of coating thickness on Isc of TENG.
Fig.5  Influences of volume ratios of water in the TENG device (10%, 20%, 30%, 40%, 50%, and 60%) on (a)Isc of TENG and (b)Voc of TENG. Isc values of the TENG under conditions of (c) different vibration frequencies and (d) different vibration distances.
Fig.6  (a) Schematic diagrams of the mechanism of IDE-based TENG with the water flow. Digital photos: (b) IDE-based TENG; (c) lighting LEDs. Output performance of IDE-based TENG: (d)Isc; (e)Voc.
Fig.7  (a) Electrochemical impedance spectra (Nyquist plots) of PAA and PAA/F-PAA coatings in 3.5 wt.% NaCl solution based on Q235. (b) Tafel curves of Q235, PAA, and PAA/F-PAA coatings.
Fig.8  Optical images of Q235 coated with (a) PAA, (b) F-PAA, and (c) PAA/F-PAA with neutral salt corrosion over 0, 10, 20, 30, and 40 d.
Fig.9  (a) Schematic diagram of the anti-corrosion protection device with TENG. (b) The OCP of Q235 changes in the presence and absence of the TENG. (c) Tafel plots of Q235 with and without TENG.
  Fig. S1(a) SEM and (b) EDS analyses of the PAA/F-PAA coating surface, and (c)(d)(e)(f) corresponding elemental mapping images of the PAA/F-PAA coating.
  Fig. S2 The vibration distance effect on the Voc of TENG.
Sample Rs/Ω Cf/µF Rf/kΩ Cdl/µF Rct/kΩ
Q235 26.73 109.7 0.2606 162.4 1.883
PAA 832.5 5.299×10−1 2.389 10.71 23.62
PAA/F-PAA 77.71 2.548×10−2 3.732 4.799 55.88
  Table S1 Electrochemical impedance parameters for Q235, PAA, and PAA/F-PAA coatings in 3.5 wt.% NaCl solution
Sample Ecorr/V (vs. SCE) Jcorr/(µA·cm−2) Βc/(mV·dec−1) Βa/(mV·dec−1)
Q235 −0.838 5.731 9.828 6.742
PAA −0.687 1.256 6.707 3.388
PAA/F-PAA −0.665 1.091 6.969 3.305
  Table S2 Electrochemical parameters obtained from Tafel curves of Q235 carbon steel connected with and without TENG
Sample Ecorr/V (vs. SCE) Jcorr/(µA·cm−2) Βc/(mV·dec−1) Βa/(mV·dec−1)
Without TENG −0.838 5.731 9.828 6.742
With TENG −0.665 1.091 6.969 3.305
  Table S3 Electrochemical parameters obtained from the Tafel curve of protected and unprotected Q235
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