Electrochemical Performance of Morphologically Different Bi₂WO₆ Nanostructures Synthesized via a Hydrothermal Route

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• 作者：Fei Wang ; Hua Yang ; Haimin Zhang ; Junyan Su…
• 关键词：Bi2WO6 nanostructures ; hydrothermal method ; different morphologies ; electrochemical performance
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：46
• 期：1
• 页码：182-187
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

Morphologically different Bi₂WO₆ nanostructures have been synthesized via a hydrothermal route, where the morphology was tailored by varying the pH value of the precursor solution. The samples prepared at pH 1, 7, and 11 consisted of flower-like hierarchical structures with average diameter of 7 μm, irregular flake-like structures with average thickness of 90 nm, and uniform spherical structures with average size of 85 nm, respectively. The electrochemical performance of the as-prepared Bi₂WO₆ samples was investigated by cyclic voltammetry, galvanostatic charge–discharge measurements, and electrochemical impedance spectroscopy. In 1 M KOH electrolyte at current density of 0.5 mA cm−2, the specific capacitance of the Bi₂WO₆ with flower-like hierarchical, flake-like, and spherical structure was measured to be 255 F g−1, 214 F g−1, and 412 F g−1, respectively. After 850 charge–discharge cycles at current density of 3 mA cm−2, the capacitance of the three samples remained at 87%, 78%, and 95% of the initial value, respectively. Among the three types of Bi₂WO₆ morphology, the spherical structure delivered the best electrochemical performance.