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

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• 作者：Syed Atif Pervez (1) (2)
  Umer Farooq (1) (2)
  Adnan Yaqub (1) (2)
  Chil-Hoon Doh (1) (2)
  Doohun Kim (1)
  Seongju Sim (1)
  Minji Hwang (1)
  Jeong-Hee Choi (1)
  You-Jin Lee (1)
  
• 关键词：Nanoparticle ; TiO2 nanotube array ; Anodization ; Li ; ion battery ; Anode
• 刊名：Journal of the Korean Physical Society
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：63
• 期：9
• 页码：1809-1814
• 全文大小：
• 作者单位：Syed Atif Pervez (1) (2)
  Umer Farooq (1) (2)
  Adnan Yaqub (1) (2)
  Chil-Hoon Doh (1) (2)
  Doohun Kim (1)
  Seongju Sim (1)
  Minji Hwang (1)
  Jeong-Hee Choi (1)
  You-Jin Lee (1)
  
  1. Korea Electro-technology Research Institute, Changwon, 642-120, Korea
  2. Electrical Functionality Material Engineering (KERI Campus), University of Science and Technology, Daejeon, 305-333, Korea
  
• ISSN：1976-8524

文摘

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.