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Development of pristine and Au-decorated Bi2O3/Bi2WO6 nanocomposites for supercapacitor electrodes

机译:用于超级电容器电极的原始和Au装饰Bi2O3 / Bi2WO6纳米复合材料的开发

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Pristine and Au-decorated Bi2O3/Bi2WO6 nanocomposites were synthesized via a facile hydrothermal method. Characterization techniques such as XRD, FESEM, HRTEM and XPS were used to explore the structural, morphological and electronic properties. Furthermore, electrochemical characterizations including cyclic voltammetry (CV), the galvanostatic charge-discharge (GCD) method, and electrochemical impedance spectroscopy (EIS) were performed to investigate the supercapacitance behaviour of the synthesized materials. Interestingly, the Au-decorated Bi2O3/Bi2WO6 nanocomposite showed a higher capacitance of 495.05 F g(-1) (1 M aqueous KOH electrolyte) with improved cycling stability (99.26%) over 2000 cycles, measured at a current density of 1 A g(-1), when compared to the pristine Bi2O3/Bi2WO6 composite (capacitance of 148.81 F g(-1) and good cycling stability (95.99%) over 2000 cycles at a current density of 1 A g(-1)). The results clearly reveal that the decoration of the Bi2O3/Bi2WO6 composite with Au nanoparticles enhances its supercapacitance behaviour, which can be attributed to an increase in electrical conductivity, good electrical contact between the electrode and electrolyte, and an increase in effective area. The Au-decorated Bi2O3/Bi2WO6 nanocomposite can be considered as an electrode material for supercapacitor application.
机译:原始和Au-装饰的Bi2O3 / Bi2WO6纳米复合材料通过一个浅显的水热法合成。表征技术如XRD,FESEM,HRTEM和XPS被用来探索的结构,形态和电子性质。此外,进行电化学表征包括循环伏安法(CV),所述恒电流充放电(GCD)方法,和电化学阻抗谱(EIS)调查合成材料的supercapacitance行为。有趣的是,Au的装饰的Bi2O3 / Bi2WO6纳米复合材料显示出495.05 F G更高的电容(-1)(1M的KOH水溶液电解质)具有改进的循环稳定性(99.26%)超过2000个周期,在将1 g的电流密度下测量(-1),相对于原始的Bi2O3 / Bi2WO6复合时(在为1 g的电流密度的148.81 F G(-1)和良好的循环稳定性(95.99%)超过2000次循环电容(-1))。结果清楚地表明,该的Bi2O3 / Bi2WO6复合用Au纳米颗粒的装饰提高了其supercapacitance行为,这可以归因于增加的导电性,在电极和电解质,并增加了有效面积之间的良好的电接触。在Au-装饰的Bi2O3 / Bi2WO6纳米复合材料可以被认为是用于超级电容器应用的电极材料。

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    《RSC Advances》 |2019年第56期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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