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Title: Synthesis and electrochemical capacitance of long tungsten oxide nanorod arrays grown vertically on substrate

Abstract

Highlights: ► Growth of long amorphous tungsten oxide nanorods on a substrate. ► Formation of single-crystalline tungsten oxide nanorods by a heat-treatment. ► High electrochemical pseudocapacitance of 2.8 mF cm{sup −2}. ► Excellent cyclability of psuedocapacitance up to 1000 cycles. -- Abstract: Long tungsten oxide nanorods are vertically grown on Al/W/Ti coated silicon substrates using a two-step anodization process. The first anodization of the Al film forms a mesh-like mask of anodic aluminum oxide, and the second anodization of the W film results in the formation of a buffer layer, a bottom nanorod, and a top nanorod of amorphous tungsten oxide. A pore-widening process prior to the second anodization leads to the enhancement of nanorod length above approximately 500 nm. After a heat-treatment, the tungsten oxide nanorods are crystallized to form a single crystalline structure while the buffer layer forms a polycrystalline structure. The crystalline tungsten oxide nanorods show a cyclic voltammogram retaining the quasi-rectangular shape of an electrochemically reversible faradaic redox reaction, i.e., a typical pseudocapacitive behavior. The maximum electrochemical capacitance per apparent surface area reaches approximately 2.8 mF cm{sup −2} at the voltage scan rate of 20 mV s{sup −1}, and the excellent cyclability of charge–discharge process ismore » maintained up to 1000 cycles.« less

Authors:
 [1]; ; ;  [2];  [1];  [3];  [2];  [3]
  1. Department of Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 305-350 (Korea, Republic of)
  2. Korea Research Institute of Standards and Science, Daejeon 305-340 (Korea, Republic of)
  3. (Korea, Republic of)
Publication Date:
OSTI Identifier:
22215601
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; ANODIZATION; CRYSTAL GROWTH; HEAT TREATMENTS; MONOCRYSTALS; NANOSTRUCTURES; POLYCRYSTALS; REDOX REACTIONS; SUBSTRATES; SYNTHESIS; TUNGSTEN OXIDES

Citation Formats

Park, Sun Hwa, Kim, Young Heon, Lee, Tae Geol, Shon, Hyun Kyong, Park, Hyun Min, Korea Research Institute of Standards and Science, Daejeon 305-340, Song, Jae Yong, E-mail: jysong@kriss.re.kr, and Department of Nano Science, University of Science and Technology, Daejeon 305-350. Synthesis and electrochemical capacitance of long tungsten oxide nanorod arrays grown vertically on substrate. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.06.053.
Park, Sun Hwa, Kim, Young Heon, Lee, Tae Geol, Shon, Hyun Kyong, Park, Hyun Min, Korea Research Institute of Standards and Science, Daejeon 305-340, Song, Jae Yong, E-mail: jysong@kriss.re.kr, & Department of Nano Science, University of Science and Technology, Daejeon 305-350. Synthesis and electrochemical capacitance of long tungsten oxide nanorod arrays grown vertically on substrate. United States. doi:10.1016/J.MATERRESBULL.2012.06.053.
Park, Sun Hwa, Kim, Young Heon, Lee, Tae Geol, Shon, Hyun Kyong, Park, Hyun Min, Korea Research Institute of Standards and Science, Daejeon 305-340, Song, Jae Yong, E-mail: jysong@kriss.re.kr, and Department of Nano Science, University of Science and Technology, Daejeon 305-350. Thu . "Synthesis and electrochemical capacitance of long tungsten oxide nanorod arrays grown vertically on substrate". United States. doi:10.1016/J.MATERRESBULL.2012.06.053.
@article{osti_22215601,
title = {Synthesis and electrochemical capacitance of long tungsten oxide nanorod arrays grown vertically on substrate},
author = {Park, Sun Hwa and Kim, Young Heon and Lee, Tae Geol and Shon, Hyun Kyong and Park, Hyun Min and Korea Research Institute of Standards and Science, Daejeon 305-340 and Song, Jae Yong, E-mail: jysong@kriss.re.kr and Department of Nano Science, University of Science and Technology, Daejeon 305-350},
abstractNote = {Highlights: ► Growth of long amorphous tungsten oxide nanorods on a substrate. ► Formation of single-crystalline tungsten oxide nanorods by a heat-treatment. ► High electrochemical pseudocapacitance of 2.8 mF cm{sup −2}. ► Excellent cyclability of psuedocapacitance up to 1000 cycles. -- Abstract: Long tungsten oxide nanorods are vertically grown on Al/W/Ti coated silicon substrates using a two-step anodization process. The first anodization of the Al film forms a mesh-like mask of anodic aluminum oxide, and the second anodization of the W film results in the formation of a buffer layer, a bottom nanorod, and a top nanorod of amorphous tungsten oxide. A pore-widening process prior to the second anodization leads to the enhancement of nanorod length above approximately 500 nm. After a heat-treatment, the tungsten oxide nanorods are crystallized to form a single crystalline structure while the buffer layer forms a polycrystalline structure. The crystalline tungsten oxide nanorods show a cyclic voltammogram retaining the quasi-rectangular shape of an electrochemically reversible faradaic redox reaction, i.e., a typical pseudocapacitive behavior. The maximum electrochemical capacitance per apparent surface area reaches approximately 2.8 mF cm{sup −2} at the voltage scan rate of 20 mV s{sup −1}, and the excellent cyclability of charge–discharge process is maintained up to 1000 cycles.},
doi = {10.1016/J.MATERRESBULL.2012.06.053},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}