Synthesis And Modification Of CuO Micro-nano Structures And Its’ Performance In Photocatalysis And Li-ion Battery

Copper oxide has been an important functional material in the industry, because of its low price and environment friendly features. Nowdays, we can always find them in the area of:light catalysis, adsorption, gas sensors, and in lithium-ion batteries. We synthesized different copper oxide micro-nano structures, and we have made the corresponding characterization of the products. Visible light catalytic research or the electrochemical properties study were carried out on related product. The body of the paper work can be divided into the following three parts:1.We use the miscibility feature between water and methylene chloride, synthesized macro porous CuO 3D structure which is assembled by ultrathin nano-sheets. X-ray diffraction showed the phase of the product is pure CuO; Scanning electron microscopy (SEM) showed the units of the prepared CuO structure is of ultrathin nano-sheets with the thickness of; Transmission electron microscopy (TEM), high-resolution transmission electron microscopy analysis (HETEM) and SAED result showed the exposed surface of nano-sheets is [11-1]. After phase research and morphology observation of the products at different reaction stages, a suitable reaction mechanism was proposed. In addition, we also studied the degradation performance of the product in photocatalytic rhodamine B (RhB) under visible light, as well as the electrochemical performance as lithium ion battery electrode material. The experimental results showed that the macroporous CuO 3D structures assembled by ultrathin nano-sheets can catalytic concentration of 50 mg/L RhB solution degradation of 90% within 30 min at room temperature, the performance is much better than copper oxide powder, free-standing CuO nano-sheets and CuO 3D structures assembled by thick sheets; Research results of the electrochemistry of the samples in CR2032 button battery, showed the performance of macroporous CuO 3D structures is much better than other samples, because the structure has a larger specific surface area, shorter Li-ion embedded journey. The material can still maintain specific capacity of 390 mAh/g, after 30 times charging and discharging cycle under the current density of 0.1 C. This is far greater than that of copper oxide powder (190 mAh/g), free-standing CuO nano-sheets (130 mAh/g) and 3D CuO structures assembled by thick sheets 220 (mAh/g).2. We obtained copper hydroxide precursors with diameter of 200-200 nm and length of several microns by controlling the reaction temperature and reaction time, between the two phase interface. After calcination of the precursors at 200 ℃, 400 ℃,600 ℃ and 800 ℃ in air for 6 h,400℃ for 1h, we obtained CuO nanowires with different morphologies and porosity.The cycling performance of the products showed that, the cycling performance of porous material is determined by porous structure and crystallinity, especially when the product is obtained by calcining metal hydroxide or metal-organic framework. These results point out the importance of optimizing crystallinity and porous structure simultaneously to obtain stable cycling performance and high capacity of the transitional metal oxide anode derived from metal hydroxides or metal organic framework. And it can provide an important reference to related material researchers.3. We use the ion substitution method synthesized surface modified copper hydroxide nanorods. By controlling the dosage of sulfur ions, the copper hydroxide nanorods can partly or completely turn into copper sulfide. X-ray diffraction analysis and SEM pictures suggested the Cu(OH)2 were modified successfully. As the dosage of sulfur source (Thioacetamide/TAA) increases, the structure and morphology of the final products changes. Afte modification the products will be calcined in nitrogen environment at 400 ℃ for 6 h. Scanning electron microscopic (SEM) showed the shape of the product after calcination. XRD results showed that ultimately product is composed by Cu7S4 and CuO. After calcination CuS was turned into Cu7S4 illustrates the recrystallization during calcination process. EDX characterization furtherly shows different sulfur content of the product. CuO/CuS heterojunction structure theoretical exists in such composites, which can improve the photocatalytic efficiency; electrochemical performance of lithium ion battery material needs to be further explored. That is to say, we obtain the potential photocatalytic performance and good electrochemical performance product through simple methods.