Synergetic effect of graphene and Co（OH）2 as cocatalysts of TiO2 nanotubes for enhanced photogenerated cathodic protection
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第2期
论文作者：Xiayu Lu Li Liu Xuan Xie Yu Cui Emeka E.Oguzie Fuhui Wang
文章页码：55 - 63
摘 要：A layer of graphene（GR） particles was successfully deposited at the interface between Co（OH）2 nanoparticles and TiO2 nanotubes, aiming to improve the photoelectrochemical performance of the large-bandgap semiconductor TiO2. The obtained Co（OH）2/GR/TiO2 was extensively characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray photoelectron spectroscopy（XPS）, UV–vis absorption spectra and photoluminescence（PL） emission spectra.Electrochemical impedance spectra, photogenerated potential-time（E-t）, photocurrent density-time（i-t） and i-E curves and open circuit potential（OCP） curves were measured to investigate the photoelectrochemical activities and photogenerated cathodic protection properties. The results revealed that Co（OH）2/GR/TiO2 exhibits excellent photoelectrochemical and photogenerated cathodic performance due to synergistic effect between Co（OH）2 and graphene. Co（OH）2 and graphene co-modified TiO2 photoanode could provide an effective protection for 304 stainless steel（304 SS） in 3.5 wt% Na Cl solution for 12 h, which would be promising for future practical applications in the field of marine corrosion protection.
Xiayu Lu1,2，Li Liu1,3，Xuan Xie1,3，Yu Cui1，Emeka E.Oguzie3,4，Fuhui Wang1,3
1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, University of Science and Technology of China3. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University4. Electrochemistry and Materials Science Research Laboratory, Department of Chemistry, Federal University of Technology
摘 要：A layer of graphene（GR） particles was successfully deposited at the interface between Co（OH）2 nanoparticles and TiO2 nanotubes, aiming to improve the photoelectrochemical performance of the large-bandgap semiconductor TiO2. The obtained Co（OH）2/GR/TiO2 was extensively characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray photoelectron spectroscopy（XPS）, UV–vis absorption spectra and photoluminescence（PL） emission spectra.Electrochemical impedance spectra, photogenerated potential-time（E-t）, photocurrent density-time（i-t） and i-E curves and open circuit potential（OCP） curves were measured to investigate the photoelectrochemical activities and photogenerated cathodic protection properties. The results revealed that Co（OH）2/GR/TiO2 exhibits excellent photoelectrochemical and photogenerated cathodic performance due to synergistic effect between Co（OH）2 and graphene. Co（OH）2 and graphene co-modified TiO2 photoanode could provide an effective protection for 304 stainless steel（304 SS） in 3.5 wt% Na Cl solution for 12 h, which would be promising for future practical applications in the field of marine corrosion protection.
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