Abstract

In this research, the ZnOG hybrid thin film was produced via solgel method. The surface morphology, band gap and photoactive properties of the films were studied by means of SEM, UV–Vis and photoluminescence analysis. In addition, the ability of the thin film in photocathodic protection of carbon steel (CS) and 304 stainless steel in 3.5 wt.% NaCl and Na₂S solutions under dark and UV illumination was investigated by polarization test as well as OCP and current measurements during coupling of steels with ZnOG photoanode. The mix band gap is reduced to the orders of 1.17 eV through hybridization of ZnO with graphene oxide. In both NaCl and Na₂S solutions, the ZnOG thin film could effectively protect the SS304 in dark condition. Moreover, UV illumination improved the level of protection via photoinduced electrons. The ZnOG film slightly accelerates the corrosion of CS in dark condition in NaCl solution. Nevertheless, UV illumination leads to photocathodic protection of CS in mentioned environment. In Na₂S solution, while coupling to ZnOG photoanode had not much effect on the surface electrochemical activity of CS, UV illumination caused photocathodic protection.

中文翻译：

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ZnO-石墨烯薄膜的光电化学活性对碳钢和304不锈钢腐蚀的影响

摘要

本研究采用溶胶凝胶法制备了ZnOG杂化薄膜。通过SEM，UV-Vis和光致发光分析研究了薄膜的表面形貌，带隙和光敏性能。此外，还通过极化测试以及OCP和电流测量研究了薄膜在3.5 wt％NaCl和Na ₂ S溶液中在黑暗和紫外线照射下对碳钢（CS）和304不锈钢进行光阴极保护的能力钢与ZnOG光电阳极的耦合过程中。通过将ZnO与氧化石墨烯杂交可以将混合带隙降低到1.17 eV数量级。在NaCl和Na _2中在溶液中，ZnOG薄膜可以在黑暗条件下有效保护SS304。此外，紫外线照射提高了通过光诱导电子的保护水平。ZnOG膜在黑暗条件下在NaCl溶液中略微加速了CS的腐蚀。然而，在上述环境中，紫外线照射导致CS的光阴极保护。在Na ₂ S溶液中，虽然与ZnOG光电阳极偶联对CS的表面电化学活性影响不大，但紫外线照射可引起光阴极保护。