Optimization of photoelectrochemical performance of Ag 2 S/TiO 2 interface by successive ionic layer adsorption and reac
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Research Letter
Optimization of photoelectrochemical performance of Ag2S/TiO2 interface by successive ionic layer adsorption and reaction Xinhua Zheng , Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing Institute of Petrochemical Technology, Beijing 102617, China Shikai Liu, School of Material Science and Engineering, Henan University of Technology, Zhengzhou 450000, China Yanhong Gu, Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing Institute of Petrochemical Technology, 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 Jie Zhao , Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing Institute of Petrochemical Technology, Beijing 102617, China Yueyang Gao, School of Automation and Electrical Engineering, Shenyang Ligong University, Shenyang 110168, China Address all correspondence to Shikai Liu at [email protected] and Yanhong Gu at [email protected] (Received 10 December 2019; accepted 29 January 2020)
Abstract The narrow bandgap of Ag2S quantum dots was used to decorate TiO2 nanotube arrays (TiO2 NTAs) by the successive ionic layer adsorption and reaction (SILAR) method to enhance its photoelectrochemical performance. The micromorphology of the photoanode films prepared by the SILAR under different parameters (including different cycle times, capillary spot sample, and ultrasound-assisted) was systematically analyzed. The photoanode film Ag2S/TiO2 prepared by the SILAR under the ultrasound-assisted method shows Ag2S evenly distributed in TiO2 NTAs. At the same time, the corresponding photoabsorption range has been extended to the visible area, while the photocurrent density and photoconversion efficiency have been increased to ∼1.8 mA/cm2 and 0.6%, respectively.
Introduction TiO2 nanotube arrays (TiO2 NTAs), as highly ordered onedimensional nanostructure, have been known to demonstrate high photoelectrochemical (PEC) and photocatalytic performances with being widely researched.[1,2] It has a wide range of applications, including solar cells, photocatalysis, and photocathodic protection.[3–6] However, due to its wide gap effect (anatase 3.2 eV and rutile 3.0 eV), only 4% of the ultraviolet light in sunlight can be used,[7] and a rapid recombination of the photogenerated electron–hole (e−–h+) in the TiO2 renders it unable to work effectively in low-light levels as well. However, coupling TiO2 NTAs with metal[8] or nonmetal,[9] or sensitizing it with semiconductor quantum dots (QDs),[10,11] can improve PEC performance effectively. Among them, the QDs having the good band gap matching with TiO2 will effectively enhance its PEC performance, and at the same time, due to the narrow band effect of QDs, the corresponding photo-absorption range will effectively be broadened. In recent years, CdS, Ag2S, CdTe,
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