Preparation and properties of Co3O4-doped TiO2 nanotube array electrodes

• Published in: Journal of applied electrochemistry Vol. 49; no. 3; pp. 305 - 314
• Main Authors: Wang, Xiaoliu, Zhao, Jianling, Xiao, Tiantian, Li, Zhongwei, Wang, Xixin
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 15.03.2019; Springer Nature B.V
• Subjects: Annealing; Arrays; Capacitance; Capacitors; Chemistry; Chemistry and Materials Science; Cobalt oxides; Crystal structure; Electrochemical analysis; Electrochemistry; Electrodes; Electrolytes; Electrons; Industrial Chemistry/Chemical Engineering; Morphology; Nanotubes; Photoelectrons; Physical Chemistry; Properties (attributes); Research Article; Scanning electron microscopy; Sodium sulfate; Titanium base alloys; Titanium dioxide; Workstations; X-ray diffraction; Electrochemical properties; nanotube arrays; TiO; Co; Co–Ti alloys; Anodization; O
• ISSN: 0021-891X; 1572-8838
• DOI: 10.1007/s10800-018-01281-z

Co 3 O 4 -doped TiO 2 nanotube array electrodes were prepared by anodizing the Co–Ti alloys with different Co contents. Morphologies, elemental compositions, crystal structures, and electrochemical properties of the samples were characterized through scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical workstation. The effects of Co content, annealing temperature and testing electrolyte on the electrochemical properties of the electrodes were studied. Results show that the areal capacitance values of TiO 2 nanotube arrays were obviously improved by doping with Co 3 O 4 . The electrochemical properties of Co 3 O 4 -doped TiO 2 nanotube array electrodes were best when the Co content in the alloys was 9%; the annealing temperature was 100 °C and the testing electrolyte was 0.5 M Na 2 SO 4 . The Co 3 O 4 -doped TiO 2 nanotube array electrodes prepared under the optimal conditions had a high areal capacitance value of 937.9 µF cm −2 when the scan rate was 10 mV s −1 and the electrodes exhibited good rate and superior cycling performance. Graphical abstract