Cadmium sulfide/lead sulfide co-sensitized TiO 2 enhances photoelectrochemical performance and corrosion resistance of 3
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Research Letter
Cadmium sulfide/lead sulfide co-sensitized TiO2 enhances photoelectrochemical performance and corrosion resistance of 304 stainless steel Xinhua Zheng , Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing 102617, China Subhabrata Das, Langmuir Center of Colloids and Interfaces, Columbia University in the City of New York, 500 W. 120th St, Mudd, New York, NY 10027, USA Yanhong Gu, Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing 102617, China Shikai Liu, School of Material Science and Engineering, Henan University of Technology, Zhengzhou 450000, China James Borovilas, Program of Materials Science and Engineering, Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA Jie Zhao , Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing 102617, China Address all correspondence to Yanhong Gu at [email protected], [email protected] (Received 19 September 2019; accepted 6 November 2019)
Abstract This paper proposes to improve the corrosion resistance of stainless steel using the photocathodic protection (PCP) method with CdS/PbS/ titanium dioxide (TiO2) as the photoanode material. Cadmium sulfide (CdS)/lead sulfide (PbS) quantum dot (QD) heterostructure layered on TiO2 enhanced the photoelectrochemical performance and improved the PCP of 304 stainless steel. The photoanode film can protect 304 stainless steel for a period of upto 3 months against corrosion. This work demonstrates that CdS/PbS/TiO2 tandem heterostructure is a promising durable and stable photoanode, which can protect stainless steel in both dark and illuminated conditions.
Introduction Photocathodic protection (PCP) is an environmentally benign and sustainable corrosion-resistant alternative, with superior photoelectric performance, compared to the traditional sacrificial anode and impressed current cathodic protection.[1,2] Electronic transmission for PCP involves the bulk transfer of photogenerated electrons to the metal substrate coupled with the photoanode film. This reduces the Fermi level of the metal below its standard corrosion redox potential, thus preventing corrosion.[3–7] Recent studies on the photoelectrochemical (PEC) performance of TiO2, an abundant and nontoxic photocatalyst, for the PCP of metals suggest that it effectively prolongs the protection time of stainless steel.[8–10] Due to a large bandgap, TiO2 can only absorb the UV wavelengths of sunlight (∼4% of sunlight falls within this range), limiting the effectiveness of protection from TiO2 photoanodes under the sunlight.[11–13] Rapid recombination of the photogenerated electron–hole (e−–h+) pairs[14] in the TiO2 renders it unable to work effectively in low-light levels as well and therefore, crucial to enhance the visible-light absorption range of TiO2 and store the energy of photogenerated carriers to demonstrate the better protection perform
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