Core–Shell Spheroid Structure TiO2/CdS Composites with Enhanced Photocathodic Protection Performance

Author:

Chen Tingting12,Li Bo2,Zhang Xiaolong1,Ke Xiang1,Xiao Rengui1ORCID

Affiliation:

1. School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

2. Institute of Electric Power Science of Guizhou Power Grid Co., Guiyang 550001, China

Abstract

In order to improve the conversion and transmission efficiency of the photoelectron, core–shell spheroid structure titanium dioxide/cadmium sulfide (TiO2/CdS) composites were synthesized as epoxy-based coating fillers using a simple hydrothermal method. The electrochemical performance of photocathodic protection for the epoxy-based composite coating was analyzed by coating it on the Q235 carbon steel surface. The results show that the epoxy-based composite coating possesses a significant photoelectrochemical property with a photocurrent density of 0.0421 A/cm2 and corrosion potential of −0.724 V. Importantly, the modified composite coating can extend absorption in the visible region and effectively separate photoelectron hole pairs to improve the photoelectrochemical performance synergistically, because CdS can be regarded as a sensitizer to be introduced into TiO2 to form a heterojunction system. The mechanism of photocathodic protection is attributed to the potential energy difference between Fermi energy and excitation level, which leads to the system obtaining higher electric field strength at the heterostructure interface, thus driving electrons directly into the surface of Q235 carbon steel (Q235 CS). Moreover, the photocathodic protection mechanism of the epoxy-based composite coating for Q235 CS is investigated in this paper.

Funder

Electric Power Research Institute of Guizhou Power Grid Co.

Publisher

MDPI AG

Subject

General Materials Science

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