Ceria deposited titania nanotubes for high performance supercapacitors. (December 2019)

• Record Type: Journal Article
• Authors: Thulasi, Kunnambeth M.; Manikkoth, Sindhu Thalappan; Paravannoor, Anjali; Palantavida, Shajesh; Bhagiyalakshmi, Margandan; Vijayan, Baiju Kizhakkekilikoodayil
• Is Part Of: Journal of physics and chemistry of solids. Volume 135(2019)
• Publication Date: 2019-12
• Subjects: Titania nanotube -- Ceria -- Supercapacitor -- Anodization; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2019.109111
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The present paper reports the application of a rare earth metal oxide – titania nano tube (TNT) composite for supercapacitor applications. Highly ordered arrays of single walled titaniananotubes of length approximately 4 μm were synthesised on titanium metal foil via a modified single step electrochemical anodization method. Nanostructured ceria is deposited on as prepared TNT by simply impregnating in cerous nitrate solution, followed by heat treatment. The characterizations were done by XRD and FE-SEM analysis. Supercapacitive performance is monitored using techniques such as CV, GCD and EIS. The pristine TNT itself shows promising supercapacitive performance (specific capacitance values ~ 6.82 mF/cm 2 ), which is enhanced significantly by coating psuedocapacitive ceria. Among different ceria deposited samples, 0.075 Ce showed the best results with specific capacitance values ~55.28 mF/cm 2 at scan rate 5 mV/s, owing to its open porous nanotubular morphology (optimal tube diameter around 20 nm) facilitating smooth charge transport and exposure of enormous amount of active material to the electrolyte, marking an enhancement of about 710% as compared to pristine TNT supercapacitors. Graphical abstract: Image 1 Highlights: Ceria-TNT composites were prepared by dipping pristine TNT in aqueous CeNO3 solution. Capactive performance were analysed by CV, GCD and EIS techniques. Performance mainly depends on amount of deposited ceria, morphology and tube diameter of the composite.