Preparation of graphene/WO3/TiO2 composite and its photocathodic protection performance for 304 stainless steel

Journal Article · Fri Jun 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.03.012· OSTI ID:22804034

Liu, Wenjie; Du, Tao; Ru, Qianxun; Zuo, Shixiang ^[1]; Cai, Yanhua ^[2]; Yao, Chao ^[1]

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1. School of Petrochemical Engineering, Changzhou University, Changzhou 213164 (China)
2. Chongqing Key Laboratory of Environmental Materials and Remediation Technology, Chongqing University of Arts and Sciences, Chongqing 402160 (China)

Highlights: • TiO{sub 2} nanoparticles and WO{sub 3} nanorods were immobilized onto graphene by the hydrothermal method. • The composite can provide an effective protection for 304 stainless steel under visible light. • The composite can offer a sufficient cathodic protection even in the dark. • Possible photocathodic protection mechanism of graphene/WO{sub 3}/TiO{sub 2} composite was proposed. - Abstract: Graphene/WO{sub 3}/TiO{sub 2} composite (RGO/WO{sub 3}/TiO{sub 2}) was successfully fabricated via a two-step hydrothermal method. The structure, morphology and optical property of the as-prepared composite were characterized by X-ray powder diffraction, fourier transform infrared spectra, Raman spectra, transmission electron microscope, scanning electron microscope and ultraviolet-visible diffuse reflectance spectra, respectively. Results showed that the composite was incorporated by graphene nanosheets, WO{sub 3} nanorods and TiO{sub 2} nanoparticles. It exhibited favorable absorption ability in both UV and visible light region. The photocathodic protection performance for 304 stainless steel (304SS) was proven by photocurrent density, open circuit potential, Tafel polarization curves and electrochemical impedance spectroscopy. It was found that the composite could provide an efficient protection for 304SS under visible light irradiation and even in the dark compared to the pure TiO{sub 2}. The electrode potentials negatively shifted to −760 mV under visible light. The possible photocathodic protection mechanism of the composite was also proposed.

• OSTI ID: 22804034
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 102; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
CATHODIC PROTECTION
FOURIER TRANSFORM SPECTROMETERS
GRAPHENE
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
MORPHOLOGY
NANOSTRUCTURES
OPTICAL PROPERTIES
PHOTOCURRENTS
POLARIZATION
RADIATION EFFECTS
RAMAN SPECTRA
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
STAINLESS STEEL-304
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN OXIDES
ULTRAVIOLET RADIATION
VISIBLE RADIATION
X-RAY DIFFRACTION