Preparation and properties of MnO2–TiO2 nanotube array composite electrodes using titanium foam as the current collector. (3rd May 2018)

• Record Type: Journal Article
• Authors: Li, Zhongwei; Wang, Xixin; Wang, Xiaoliu; Xiao, Tiantian; Zhang, Laiqi; Lv, Penggong; Zhao, Jianling
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 18(2018)
• Page Start: 8859
• Page End: 8867
• Publication Date: 2018-05-03
• Subjects: Titanium foam -- MnO2 -- TiO2 nanotube arrays -- Current collector -- Composite electrodes -- Supercapacitor; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.03.138
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: MnO2 –TiO2 nanotube array composite electrodes were prepared through depositing MnO2 onto TiO2 nanotube arrays obtained by anodization of the titanium foam and the effect of morphologies of TiO2 nanotube arrays on the performance of the electrode was investigated. Results show that the wall thickness, the tube diameter and the tightness among the nanotubes affected the performance of composite electrodes. The areal, quality and volume capacitance value of the optimized sample reached up to 436.2 mF/cm 2, 1470.8 mF/g and 5452.5 mF/cm 3, respectively, at a current density of 0.1 mA/cm 2, which were significantly higher than those of the MnO2 –TiO2 nanotube array composite electrodes using planar titanium foil as the current collector. The capacitance retention was 85.7% after 3000 cycles. In addition, the influences of the cations (Li +, Na +, K +, NH4 + ) and anions (Cl −, Br −, I −, CH3COO − ) in the testing electrolytes on the capacitance properties were also studied in detail. Graphical abstract: Highlights: MnO2 –TiO2 composite films were prepared by using Ti foam as the current collector. The Ti foam based sample was 15 times the capacitance of planar Ti based sample. The optimized sample achieved a high capacitance of 436.2 mF/cm 2 at 0.1 mA/cm 2 . Ionic radius in the testing electrolytes affects the capacitance severely.