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Subject: search.filters.subject.Electrochemical capacitor

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    Structural, optical and electrochemical performances of undoped and Sn2+-doped Bi2Te3 nanoparticles on WO3 electrodes
    (2020-01-01)
    Buddeesao, Mirantee
    ;
    Raknual, Duanghatai
    ;
    Tubtimtae, Auttasit
    ;
    Vailikhit, Veeramol
    ;
    Teesetsopon, Pichanan
    A facile synthesis approach was used to prepare Sn<sup>2+</sup>-doped Bi<inf>2</inf>Te<inf>3</inf> nanospheres on a WO<inf>3</inf> electrode, and the pseudo-capacitive property was measured for samples prepared with optimum parameters. SEM micrographs revealed that after the Sn<sup>2+</sup> doping, the morphology of Bi<inf>2</inf>Te<inf>3</inf> changed from aggregated or network-like nanoparticles to smaller nanospheres with a homogeneous distribution. The X-ray diffraction pattern showed rhombohedral Bi<inf>2</inf>Te<inf>3</inf> coated on the WO<inf>3</inf> electrode. Due to the more abundant electro-active sites and charge carriers that diffused through the electrolyte to the working electrode, the Sn<sup>2+</sup>-doped Bi<inf>2</inf>Te<inf>3</inf> electrode displayed the highest specific capacity of 41.4 mAh/g at a scan rate 10 mV/s, a power density of 0.63 kW/kg, an energy density of 24.5 Wh/kg, and an LSV breakdown potential of 0.26 V. These materials may be applied in potential pseudo-capacitors and in further energy storage devices.
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    Synthesis of low-cost titanium dioxide-based heterojunction nanocomposite from natural ilmenite and leucoxene for electrochemical energy storage application
    (2018-08-01)
    Phoohinkong, Weerachon
    ;
    Pavasupree, Sorapong
    ;
    Mekprasart, Wanichaya
    ;
    Pecharapa, Wisanu
    Titanium dioxide-based nanocomposites were prepared by simple mixing titanium dioxide with activated ilmenite and leucoxene. Raw ilmenite and leucoxene ore were firstly activated by modified ball-milling process by sulfuric acid assist to obtain activated ilmenite and leucoxene. The mixture between activated ilmenite/leucoxene with commercial anatase titanium dioxide and followed by heat treatment samples demonstrate enhance electrochemical capacitor performance. Phase compositions of prepared samples were confirmed by X-ray diffraction (XRD). The local structure changes were investigated by X-ray absorption spectroscopy (XAS). The particle size and morphology were studied by field emission scanning electron microscope (FE-SEM). The chemical states of the nanocomposites were investigated by X-ray photoelectron spectroscopy (XPS). Electrochemical properties of the prepared nanocomposites were conducted using cyclic voltammetry (CV). Results in this work introduce cost-effectiveness and simple route to prepare electroactive nanocomposite electrode materials from natural ore with enhanced electrochemical capability. The particle size, structure, morphology, heterojunction interface and surface characteristics show significant key to improve electron transfer activity regarding the modification of the specific active sites.
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