氧化锌表面包覆Sn_6O_4(OH)_4的制备及其在锌镍电池中的应用
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摘要
采用水热-共沉淀法在氧化锌表面包覆锡化合物,利用扫描电子显微镜(SEM)、X射线衍射(XRD)和能谱分析(EDS)对制备的包覆ZnO材料进行表征。结果表明:XRD表明附着在氧化锌表面的是Sn_6O_4(OH)_4,且结晶度较好;SEM测试显示在p H=12条件下,Sn_6O_4(OH)_4能够很好地附着在氧化锌颗粒表面;EDS显示组成物中的元素包含Zn、Sn、O三种元素。利用循环伏安曲线(CV)、电化学阻抗谱(EIS)、倍率充放电技术对包覆ZnO材料进行了电化学性能的测试,结果表明:包覆Sn_6O_4(OH)_4的ZnO可以提高锌负极的耐蚀性能,增大电荷转移电阻(Rct);锌电极覆Sn_6O_4(OH)_4量为3%时充放电效率最佳,在0.2C充放循环40次后充放电循环保持率仍有70%。
The hydrothermal-coprecipitation method was successfully used to prepare Sn_6O_4(OH)_4 coated on the surface of zinc oxide. The modified ZnO material was characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD) and energy dispersive spectrometer(EDS) analysis. The results show: Sn_6O_4(OH)_4was coated on the surface of ZnO and the crystallinity was well at p H=12, and the coating composition is including Zn, Sn, O.The electrochemical performances of Sn_6O_4(OH)_4-coated ZnO was investigated by cyclic voltammetry(CV),electro-chemical impedance spectroscopy(EIS) and charge-discharge technology. Compared with pure ZnO, The CV curves and the electrochemical impedance spectroscopy show that Sn_6O_4(OH)_4-coated ZnO can improve the corrosion resistance and increase charge transfer resistance(Rct), Sn_6O_4(OH)_4-coated ZnO electrode has best charge-discharge efficiency when the Sn_6O_4(OH)_4content is 3%, and the capacity retention ratio of the coated ZnO is about 70% after over 40 cycles with the rate of 0.2C, which is much higher than that of the pure ZnO.
The hydrothermal-coprecipitation method was successfully used to prepare Sn_6O_4(OH)_4 coated on the surface of zinc oxide. The modified ZnO material was characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD) and energy dispersive spectrometer(EDS) analysis. The results show: Sn_6O_4(OH)_4was coated on the surface of ZnO and the crystallinity was well at p H=12, and the coating composition is including Zn, Sn, O.The electrochemical performances of Sn_6O_4(OH)_4-coated ZnO was investigated by cyclic voltammetry(CV),electro-chemical impedance spectroscopy(EIS) and charge-discharge technology. Compared with pure ZnO, The CV curves and the electrochemical impedance spectroscopy show that Sn_6O_4(OH)_4-coated ZnO can improve the corrosion resistance and increase charge transfer resistance(Rct), Sn_6O_4(OH)_4-coated ZnO electrode has best charge-discharge efficiency when the Sn_6O_4(OH)_4content is 3%, and the capacity retention ratio of the coated ZnO is about 70% after over 40 cycles with the rate of 0.2C, which is much higher than that of the pure ZnO.
引文
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