One-dimensional Ag2S/ZnS/ZnO nanorod array films for photocathodic protection for 304 stainless steel

doi:10.1016/j.jmst.2019.09.035

Abstract

Abstract:

Highly ordered Ag₂S/ZnS/ZnO nanorod array film photoanodes were prepared on a Ti substrate for photocathodic cathodic protection. The results indicated that the photoresponse range of the Ag₂S/ZnS/ZnO composite film was extended compared to those of the ZnO and ZnS/ZnO films, indicating its higher light absorption capacity. When the Ag₂S/ZnS/ZnO composite film served as a photoanode, the film can provide the best effective photocathodic protection for 304 stainless steel in a 3.5 wt% NaCl solution under white light illumination compared to the ZnO and ZnS/ZnO films. Additionally, in comparison to pure ZnO film, the photocurrent for the ZnS/ZnO film remained the same without noticeable fluctuation after illumination for 1 h, indicating that the ZnS functionalization improved the stability by overcoming the photocorrosion effect of the ZnO photoanode under light irradiation.

Key words: Ag₂S/ZnS/ZnO, Nanorod array films, Stainless steel, Photocathodic protection

Na Wei, Yuan Lin, Zhenkui Li, Wenxia Sun, Guosong Zhang, Mingliang Wang, Hongzhi Cui. One-dimensional Ag2S/ZnS/ZnO nanorod array films for photocathodic protection for 304 stainless steel[J]. J. Mater. Sci. Technol., 2020, 42: 156-162.

Figures/Tables 10

Fig. 1. XRD spectra (a) of all prepared samples, survey (b), high-resolution XPS spectra of Zn 2p (c), Ag 3d (d), S 2p (e) and O 1s (f) for Ag2S/ZnS/ZnO NRA films.

Fig. 2. SEM images of (a) surface and (b) cross section of ZnO NRA film, (c) ZnS/ZnO NRA film, (d) Ag2S/ZnS/ZnO NRA film.

Fig. 3. Typical TEM image (a) and HRTEM images (b, c) of Ag2S/ZnS/ZnO NRA film.

Fig. 4. UV-vis absorption spectra of ZnO NRA film, ZnS/ZnO NRA film and Ag2S/ZnS/ZnO NRA film.

Fig. 5. Photocurrent-time curves of ZnO, ZnS/ZnO and Ag2S/ZnS/ZnO electrodes under intermittent illumination with white light.

Fig. 6. Open circuit potential-time curves of 304SS coupled with ZnO, ZnS/ZnO and Ag2S/ZnS/ZnO electrodes under on-off white light illumination.

Fig. 7. EIS plots and equivalent circuit of 304SS and 304SS coupled with ZnO ZnS/ZnO and Ag2S/ZnS/ZnO electrodes under white light illumination: (a, b) Bode plots; (c, d) Nyquist plots; equivalent circuit model for the impedance spectra of (e) 304SS and (f) Ag2S/ZnS/ZnO electrodes.

Table 1 Fitted results of different impedance elements for 304SS, ZnO, ZnS/ZnO and Ag2S/ZnS/ZnO electrodes under white light irradiation.

Sample	R_s	Q₁		R_f	Q₂		R_t
Sample	(Ω cm²)	Y₀ (Sⁿ Ω cm^-2)	n₁	(kΩ cm²)	Y₀ (Sⁿ Ω cm^-2)	n₂	(kΩ cm²)
304 SS	8.48	/	/	/	28.97 × 10^-6	0.88	52.74
ZnO	8.01	100.3 × 10^-5	0.73	22.41	70.53 × 10^-6	0.90	30.51
ZnS/ZnO	7.14	74.99 × 10^-5	0.82	28.63	69.29 × 10^-6	0.89	21.23
Ag₂S/ZnS/ZnO	7.25	64.5 × 10^-5	0.78	55.27	152.4 × 10^-6	0.95	13.07

Fig. 8. Photocurrent-time curves of ZnO, ZnS/ZnO (a) and Ag2S/ZnS/ZnO (b) electrodes under light illumination about 3600 s.

Fig. 9. Mechanism of photocathodic protection of Ag2S/ZnS/ZnO NRA film.

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