Improved performance of Ag-nanoparticle-decorated TiO2 nanotube arrays in Li-ion batteries

Journal of the Korean Physical Society - 2013
Syed Atif Pervez1,2, Umer Farooq2,1, Adnan Yaqub2,1, Chil-Hoon Doh2,1, Doohun Kim1, Seongju Sim1, Minji Hwang1, Jeong-Hee Choi1, You-Jin Lee1
1Korea Electro-technology Research Institute, Changwon, Korea
2Electrical Functionality Material Engineering (KERI Campus), University of Science and Technology, Daejeon, Korea

Tóm tắt

The present work investigates the electrochemical response of silver nanoparticle (Ag-NP)-decorated TiO2 nanotube (NT) layers as an anode material for a lithium-ion battery. Self-organized nanotube layers with a thickness of approximately 1 µm and a diameter of approximately 100 nm were grown by anodization of Ti in a fluoride-containing aqueous electrolyte. Ag NPs (average particle size of ∼10 nm) were deposited both inside and outside the nanotube geometry in a well-distributed manner through a simple and efficient photocatalytic reduction process. The morphology and the chemical composition of the resulting materials were characterized by using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). Our results show that the TiO2 NT layers decorated with Ag NPs had a superior electrochemical response in terms of charge/discharge capacity, rate capability, cyclic performance and columbic efficiency. The enhanced performance is attributed to the improved electronic and ionic conductivity, obtained by providing highly conductive paths to electrons flowing through a well-distributed Ag NPs deposition on the walls of the highly-oriented NTs.

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Journal of the Korean Physical Society

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