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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111833


    Title: Synergistic-effect-controlled CoTe2/carbon nanotube hybrid material for efficient water oxidation
    Authors: T. H. Lu, C. J. Chen, Y. R. Lu, C. L. Dong*, and R. S. Liu*
    Date: 201109
    Issue Date: 2017-10-25 02:11:04 (UTC+8)
    Abstract: In anode, electrocatalytic water splitting involves oxygen
    evolution reaction (OER), which is a complex and sluggish reaction, and
    thus the efficiency to produce hydrogen is seriously limited by OER. We
    report that CoTe2 exhibits optimized OER activity for the first time.
    Multiwalled carbon nanotube (MWCNT) is utilized to support CoTe2 in
    generating a synergistic effect to enhance OER activity and improve
    stability by tuning different loading amounts of CoTe2 on CNT. In 1.0 M
    KOH, bare CoTe2 needed overpotential of 323 mV to produce 10 mA/
    cm2 with Tafel slope of 85.1 mV/dec, but CoTe2/carbon nanotube
    (CNT) with optimized loading amount of CoTe2 required only 291 mV
    to produce10 mA/cm2 with Tafel slope of 44.2 mV/dec. X-ray absorption
    near edge structure (XANES) was applied to prove that an electron
    transfer from eg band of CoTe2 to CNT caused a synergistic effect. This
    electron transfer modulated the bond strength of oxygen-related intermediate species on the surface of catalyst and optimized
    OER performance. In situ XANES was used to compare CoTe2/CNT and pristine CoTe2 during OER. It proved the transition
    state of CoOOH more easily existed by adding CNT in hybrid material during OER to enhance the efficiency of OER. Moreover,
    bare CoTe2 is unstable under OER, but the CoTe2/CNT hybrid materials exhibited improved and exceptional durability by timedependent
    potentiostatic electrochemical measurement for 24 h and continuous cyclic voltammetry for 1000 times. Our result
    suggests that this new OER electrocatalyst for OER can be applied in various water-splitting devices and can promote hydrogen
    economy.
    Relation: J. Phys. Chem. C 2016, 120, 28093
    Appears in Collections:[物理學系暨研究所] 期刊論文

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