121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-124
Subject Synthesis of NiWO4-WO3 composite nanofibers and Its application for electrocatalysis
Authors Ha Yeon Kim, So Hyun Jeon, Myung Hwa Kim*
Chemistry & Nano Science, Ewha Womans University, Korea
Abstract Nickel tungsten oxide (NiWO4)-Tungsten oxide (WO3) composite nanofibers were synthesized by electrospinning technique combined with thermal annealing. Morphologies of synthesized nanofibers were imaged by scanning electron microscopy (SEM), transmission electron microscopy(TEM). Crystalline structures and surface properties were identified by Raman spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Electrospun NiWO4/WO3 composite nanofibers showed rough and porous surface composed of aggregation of many small grains like nanocrystals of NiWO4 and WO3. In addition, the morphology of NiWO4-WO3 composite nanofibers is tube-like that outer diameter of the nanofiber is about 250nm and inner hole diameter is about 100nm. It is expected that NiWO4/WO3 hybrid nanostructures are contributed to changes in the annealing temperature and ratio of precursors. Generally, tungsten oxide has high electrical conductivity due to semiconducting behaviors and its nanostructures have been used for many applications such as photocatalysts and electrochemical materials. High electrical conductivity and thermal sensitivity of nickel oxide has been utilized in various catalyst applications and conductive films. Thus, the composite nanostructures between NiWO4 and WO3 are able to increase electrocatalytic and electrochemical activity than their single phase nanostructures.
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