Tungsten carbide nanofibers prepared by electrospinning with high electrocatalytic activity for oxygen reduction

被引:66
作者
Zhou, Xiaosong [1 ]
Qiu, Yejun [1 ]
Yu, Jie [1 ]
Yin, Jing [1 ]
Gao, Shang [1 ]
机构
[1] Univ Town, Dept Mat Sci & Engn, Shenzhen Grad Sch, Harbin Inst Technol, Shenzhen 518055, Peoples R China
关键词
Tungsten carbide; Nanofibers; Electrospinning; Oxygen reduction; Electrocatalyst; NH3; etching; OXIDE NANOFIBERS; CATALYSTS; ELECTRODE; ARRAYS;
D O I
10.1016/j.ijhydene.2011.03.081
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Tungsten carbide (WC) nanofibers with ultrafine diameters were synthesized by carbonizing the as-spun ammonium metatungstate (AMT) and polyvinyl pyrrolidone (PVP) composite fiber precursors. The morphologies of the WC nanofiber products were closely related to the electrospinning concentrations of AMT and PVP. Raman spectra and high resolution T EM (HR-TEM) testified that the surface of the WC nanofibers was coated by a carbon layer with a thickness of several nanometers, which could be removed to a great degree by NH3 etching at high temperature. Cyclic voltammetry (CV) and rotating disk electrode (RDE) test results showed that the carbon-coated WC nanofibers had good electrocatalytic activities and stabilities during oxygen reduction reaction (ORR), both of which could be further improved by NH3 post-treatment at high temperature. The catalytic roles of the WC nanofiber samples for ORR probably originated from the WC sites, but not excluding some contributions of the surface carbon species. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:7398 / 7404
页数:7
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