Improved photocathodic protection performance of g-C3N4/rGO/ZnS for 304 stainless steel. (January 2021)

• Record Type: Journal Article
• Authors: Zheng, Hongai; Liu, Yue; Zhou, Yiheng; Zhao, Dongling; Wang, Derui; Yun, Le; Zhang, Daquan; Zhang, Lizhi
• Is Part Of: Journal of physics and chemistry of solids. Volume 148(2021)
• Publication Date: 2021-01
• Subjects: Graphitic carbon nitride -- Photocathodic protection -- Photoelectrochemical -- 304 stainless steel; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2020.109672
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: In this work, we report g-C3 N4 /rGO/ZnS composites used in photocathodic protection to effectively enhance proton reduction capacity. The g-C3 N4 /rGO/ZnS composites are synthesized by two-step hydrothermal method. The structure, morphology, and optical properties of the obtained composites are characterized by XRD, SEM, TEM and UV–vis. The performance of photocathodic protection for the 304 stainless steel is evaluated by the photoelectrochemical measurements. Results indicate that ternary composite exhibit enhanced photocathodic protection performance for 304 stainless steel compared with the pure g-C3 N4 . Especially when the 304 stainless steel is coupled to the 15%-rGO/g-C3 N4 /ZnS composites, its photo-induced current density at the bias of 0.23 V (vs. SCE) reaches 2180 μA/cm 2 which is about 4 times higher than that of g-C3 N4 alone. The enhanced photocathodic protection performance is attributed to the high charge carrier separation efficiency. Meanwhile, rGO adjusts the fermi level of 15%-rGO/g-C3 N4 /ZnS composites which results obviously negative shift of EFB . Graphical abstract: Image 1 Highlights: The rGO/g-C3 N4 /ZnS composites were successfully synthesized by two-step hydrothermal method. The photoelectrochemical measurements results indicate that ternary composites exhibit drastically enhanced photocathodic protection performance for 304 stainless steel compared with the pure g-C3 N4 . The mechanism is that enhanced photocathodic protection performance is attributed to the high charge carrier separation efficiency.