純相氧化亞銅薄膜可以電化學沈積法製備於鍍白金之矽基板上，經由XRD與XPS的結構分析確認此沈積膜為一單相組成。薄膜之織構可因溶液之pH值或過電位之變化而轉變。具(200)織構之氧化亞銅薄膜之晶粒型態為四面體之金字塔型，而具(111)織構之薄膜晶粒型態則為三角形。具(200)織構之氧化亞銅薄膜之成長行為屬柱狀晶成長，而具(111)織構之薄膜的成長則由二次成核與成長所主導。
由循環伏安法及充放電循環測試結果，發現氧化亞銅薄膜與鋰金屬間之可逆電化學反應是發生於兩者間的氧化還原。改變沈積時間可調整薄膜厚度，而由厚度差異所引起之不同的電阻極化現象則使不同厚度薄膜之電化學性質深受影響。溶液溫度對薄膜之晶粒大小及後續電化學性質的影響並不明顯。具(200)織構之薄膜因其相異之微結構，而使其較具(111)織構之薄膜有更佳的電化學性質。隨著充放電速率提高而下降的電容量，顯示由於氧化亞銅本身高電阻率所造成的電阻極化，將是氧化亞銅實際應用在鋰離子電池上的最大限制。
本研究是第一個探討有關氧化亞銅奈米線與鋰離子之電化學性質及其在電池之應用。結合模板輔助成長，利用電化學沈積法可成功製備出直徑與長度分別為60及450 nm之準直成長的純相氧化亞銅奈米線。循環伏安掃瞄的結果顯示奈米線與鋰金屬間具有可逆反應性，其反應行為與氧化亞銅薄膜相似。而充放電循環測試結果則顯示此奈米線陣列經100次循環後，其電容量仍可維持在330 mAh/g。
在外加電流密度為0.05 mA/cm2的條件下，所得到的奈米線是純相的氧化亞銅。而當電流密度提高至15 mA/cm2時，所得者為純銅的奈米線。而在介於這兩個電流密度之間沈積，可得銅與氧化亞銅的複合相，且銅的含量隨電流密度的增加而提高。TEM的觀察結果顯示複合相奈米線是由獨立的銅與氧化亞銅的奈米晶粒所組成，與複合相薄膜的層狀結構不同。而在生成複合相奈米線時會產生自發性之電極電位規則震盪，乃因表面局部pH值之變化所引起的交替性電化學反應所導致。
循環伏安掃瞄結果顯示，單相氧化亞銅與銅/氧化亞銅複合相奈米線，其與鋰金屬間之電化學反應的方式相當類似。但複合相奈米線的放電電容量隨著銅含量的提高而下降，此乃肇因於銅奈米晶粒在奈米線中係扮演鋰離子擴散的阻礙者。雖然高銅含量降低了電容量，但由於銅提高奈米線之平均導電率進而降低了電阻極化，可大幅改善其在高放電速率下之電容量的衰退。

The sole Cu2O films were fabricated onto the platinum coated silicon wafer. The structural characterization by XRD and XPS indicates that pure Cu2O films were obtained. The texture of the films could be modified by simply changing the bath pH or overpotential. The crystal shape of the (200) preferred films was dominated by four-sided grains, while that of the (111) preferred films was predominated by three-sided grains. It was found that the growth of the (200) preferred films adopted by the columnar growth with a coalescence mechanism. However, the (111) preferred films followed a mechanism of secondary nucleation and growth.
The electrochemical characteristics by CV and cycling tests indicated that the reversible reaction of Cu2O/Li cells is attributed to the redox reaction between Cu2O and Li. The thickness of films could be modulated simply by changing the deposition durations. The dependence of film thickness on the reversible capacity was affected by the resistance polarization. The influence of bath temperature on the grain size of films and their consequent effect on the discharge capacity may be neglected. The results of rate capability implied that the poor conductivity was the main factor affecting the electrochemical behavior of Cu2O films for the Li-ion batteries applications. It was also found that the (200) textured films exhibit better electrochemical property toward Li than the (111) textured ones due to the different microstructure features originating from different growth behavior.
This study was the first investigation on the electrochemical performance of Cu2O nanorods for Li ion battery application. The template-mediated electroplating has been applied to fabricate Cu2O nanorod arrays. The morphological observation showed that the nanorods with 60nm diameter and 450nm length were grown perpendicularly to the substrate. The CV sweeping indicated a reversible electrochemical reactivity between Cu2O nanorods and Li. The cycling test showed that the nanorod arrays exhibit a capacity of 330 mAh/g after 100 cycles.
The pure Cu2O nanorods were obtained at low current density, of 0.05mA/cm2, while pure Cu nanorods appeared under high current density, of 15mA/cm2. Between these two current densities, the Cu/Cu2O composite nanorods were obtained and the content of Cu increased as the applied current density increased. The TEM observation indicated that the composite nanorods are composed of isolated Cu and Cu2O grains, which contradicted to the layered structure observed in Cu/Cu2O thin films. The periods of spontaneous oscillation were a function of the applied current density. The variation of local pH was the main reason resulting in the occurrence of spontaneous potential oscillations in the present system.
For both the pure Cu2O and Cu/Cu2O composite nanorods, the CV sweeping showed the similar electrochemical reactions toward Li during discharge/recharge cycling. The reversible discharge capacity decreased with the Cu content of nanorods due to the suppressed Li ion diffusion coefficient. Although the composite nanorods with highest Cu content exhibited the lowest discharge capacity, the nanorods revealed the highest rate capability due to the higher electrical conductivity that minimizes the resistance polarization.

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