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首页> 外文期刊>Electrochimica Acta >Nanostructured CuO thin film electrodes prepared by spray pyrolysis: a simple method for enhancing the electrochemical performance of CuO in lithium cells
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Nanostructured CuO thin film electrodes prepared by spray pyrolysis: a simple method for enhancing the electrochemical performance of CuO in lithium cells

机译：喷雾热解法制备纳米结构的CuO薄膜电极：一种增强CuO在锂电池中电化学性能的简单方法

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Nanostructured CuO thin films were prepared by using a spray pyrolysis method, copper acetate as precursor and stainless steel as substrate. The textural and structural properties of the films were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The SEM images revealed thorough coating of the substrate and thickness of 450-1250 nm; the average particle size as determined from the AFM images ranged from 30 to 160 nm. The XRD patterns revealed the formation of CuO alone and the XPS spectra confirmed the presence of Cu{sup}(2+) as the main oxidation state on the surface. The films were tested as electrodes in lithium cells and their electrochemical properties evaluated from galvanostatic and step potential electrochemical spectroscopy (SPES) measurements. The discharge STEP curves exhibited various peaks consistent with the processes CuO <=>Cu{sub}2O <=> Cu and with decomposition of the electrolyte, a reversible process in the light of the AFM images. The best electrode exhibited capacity values of 625 Ah kg{sup}(-1) over more than 100 cycles. This value, which involves a CuO <=> Cu reversible global reaction, is ca. 50% higher than that reported for bulk CuO. The nanosize of the particles and the good adherence of the active material to the substrate are thought to be the key factors accounting for the enhanced electrochemical activity found.
机译：采用喷雾热解法，以醋酸铜为前驱体，以不锈钢为基底，制备了纳米结构的CuO薄膜。通过扫描电子显微镜（SEM），原子力显微镜（AFM），X射线衍射（XRD）和X射线光电子能谱（XPS）表征了膜的结构和结构性质。 SEM图像显示了基材的彻底涂层和450-1250 nm的厚度。由AFM图像确定的平均粒度为30至160nm。 X射线衍射图谱表明仅形成了CuO，XPS光谱证实了Cu {sup}（2+）作为表面主要氧化态的存在。将该膜作为锂电池中的电极进行测试，并通过恒电流和阶梯电势电化学光谱（SPES）测量评估其电化学性能。放电STEP曲线显示出与过程CuO <=> Cu {sub} 2O <=> Cu和电解质的分解一致的各种峰，电解质的分解是根据AFM图像可逆的过程。最好的电极在超过100个循环中显示出625 Ah kg {sup}（-1）的电容值。涉及CuO = Cu可逆全局反应的该值是约。比散装CuO报告的要高50％。颗粒的纳米尺寸和活性材料对基材的良好附着力被认为是解释增强的电化学活性的关键因素。

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