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首页> 外文期刊>RSC Advances >Pulsed laser deposited CoFe2O4 thin films as supercapacitor electrodes
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Pulsed laser deposited CoFe2O4 thin films as supercapacitor electrodes

机译：脉冲激光沉积CoFe2O4薄膜作为超级电容器电极

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摘要

The influence of the substrate temperature on pulsed laser deposited (PLD) CoFe2O4 thin films for supercapacitor electrodes was thoroughly investigated. X-ray diffractometry and Raman spectroscopic analyses confirmed the formation of CoFe2O4 phase for films deposited at a substrate temperature of 450 degrees C. Topography and surface smoothness was measured using atomic force microscopy. We observed that the films deposited at room temperature showed improved electrochemical performance and supercapacitive properties compared to those of films deposited at 450 degrees C. Specific capacitances of about 777.4 F g(-1) and 258.5 F g(-1) were obtained for electrodes deposited at RT and 450 degrees C, respectively, at 0.5 mA cm(-2) current density. The CoFe2O4 films deposited at room temperature exhibited an excellent power density (3277 W kg(-1)) and energy density (17 W h kg(-1)). Using electrochemical impedance spectroscopy, the series resistance and charge transfer resistance were found to be 1.1 omega and 1.5 omega, respectively. The cyclic stability was increased up to 125% after 1500 cycles due to the increasing electroactive surface of CoFe2O4 along with the fast electron and ion transport at the surface.
机译：彻底研究了衬底温度对脉冲激光沉积（PLD）COFE2O4薄膜的影响，用于超级电容器电极。 X射线衍射测定和拉曼光谱分析证实了在450℃的底物温度下沉积的薄膜形成CoFe2O4相的形成。使用原子力显微镜测量地形和表面平滑度。我们观察到，与在450℃下沉积的薄膜相比，沉积在室温下沉积的薄膜显示出改善的电化学性能和超级电容性。获得约777.4fg（-1）和258.5fg（-1）的特定电容分别在室温和450℃下沉积在0.5mAcm（-2）电流密度。在室温下沉积的COFE2O4薄膜表现出优异的功率密度（3277W kg（-1））和能量密度（17Wh kg（-1））。使用电化学阻抗光谱，分别发现串联电阻和电荷传递电阻为1.1ω和1.5Ω。由于COFE2O4的电活性表面随着快速电子和离子传输，在1500次循环之后，循环稳定性增加高达125％。

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  • 来源
    《RSC Advances》 |2020年第33期|共7页
  • 作者

    Nikam S. M.; Sharma A.; Rahaman M.; Teli A. M.; Mujawar S. H.; Zahn D. R. T.; Patil P. S.; Sahoo S. C.; Salvan G.; Patil P. B.;

  • 作者单位

    Shivaji Univ Sch Nanosci &

    Technol Kolhapur 416004 Maharashtra India;

    Tech Univ Chemnitz Semicond Phys D-09107 Chemnitz Germany;

    Tech Univ Chemnitz Semicond Phys D-09107 Chemnitz Germany;

    Shivaji Univ Dept Phys Kolhapur 416004 Maharashtra India;

    Yashavantrao Chavan Inst Sci Dept Phys Satara 415001 Maharashtra India;

    Tech Univ Chemnitz Semicond Phys D-09107 Chemnitz Germany;

    Shivaji Univ Sch Nanosci &

    Technol Kolhapur 416004 Maharashtra India;

    Cent Univ Kerala Dept Phys Kasaragod 671320 Kerala India;

    Tech Univ Chemnitz Semicond Phys D-09107 Chemnitz Germany;

    Shivaji Univ New Coll Dept Phys Kolhapur 416012 Maharashtra India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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