Improved photocathodic protection performance of C-vacancy g-C3N4/GO/WO3 for 304 stainless steel. (January 2022)

• Record Type: Journal Article
• Authors: Zheng, Hongai; Jiang, Shuangyan; Liu, Yue; Sun, Xin; Wang, Derui; Zhou, Yao; Zhu, Meilin; Zhang, Daquan; Zhang, Lizhi
• Is Part Of: Journal of physics and chemistry of solids. Volume 160(2022)
• Publication Date: 2022-01
• Subjects: Photocathodic protection -- Graphite carbon nitride -- 304 stainless steel -- Heterostructure; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2021.110270
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: In this work, C-vacancy g-C3 N4 /GO/WO3 composite was prepared by calcination method, and its composition, morphological characteristics and electrochemical properties were systematically analyzed. Compared with C-vacancy g-C3 N4 and WO3, the photocathode protection effect of C-vacancy g-C3 N4 /GO/WO3 for 304 stainless steel was improved. The AC impedance results showed that, compared with C-vacancy g-C3 N4, the Rct value of C-vacancy g-C3 N4 /GO/WO3 coupled with 304 stainless steel decreased from 1841 Ω cm 2 to 21.31 Ω cm 2 . A heterostructure of WO3 and C-vacancy g-C3 N4, obviously improved the catalytic effect of composite materials, and GO reduced the Fermi level of the system. The possible mechanism of photogenerated cathodic protection was analyzed in detail. Highlights: The absorption boundary of C-vacancy g-C3 N4 /GO/WO3 was red-shifted toward the visible area. The photo-induced carriers' recombination of composite materials was inhibited. The 304 stainless steel was effectively protected when coupled to photo-anode. The mechanism for composite materials to enhance photoelectrochemical protection is proposed.