超细银纳米线制备及其在电催化与超级电容器方面的应用研究

发布时间：2018-01-16 18:18

本文关键词：超细银纳米线制备及其在电催化与超级电容器方面的应用研究　出处：《天津理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：由于良好的光学、电学、热学和机械性质,银纳米线及其复合物在柔性透明导电膜,催化剂,传感器,以及能量转换与存储等方面拥有广泛的应用。因此,银纳米线的制备及应用开发受到了广泛关注。本论文的主要内容是超细银纳米线和其复合材料的制备及其在二氧化碳电还原和超级电容器方面的应用,取得的主要研究结果如下:(1)超细银纳米线的制备以乙二醇和一缩二乙二醇混合作为溶剂在聚乙烯吡咯烷酮(PVP)及控制剂(NaCl和KBr)存在下通过一步多元醇法,成功制备了平均直径为30nm长径比大于1000的银纳米线。同时,通过使用乙二醇和一缩二乙二醇或二缩三乙二醇及其两者混合作为溶剂和还原剂,研究了多元醇的还原性及粘度对于最终银纳米材料形貌的影响。(2)银纳米线电极作为自支撑二氧化碳电还原催化剂性能研究以制备的银纳米线为自支撑电极,研究了其电催化还原二氧化碳性能。实验结果表明,银纳米线自支撑电极能够在电压为-0.9V(相对于可逆氢电极)时电催化还原二氧化碳为一氧化碳的选择性约为80%。(3)银纳米线与四氧化三锰核壳复合材料的制备及其作为超级电容器电极材料性能研究通过简单的化学合成方法,成功制备了银纳米线与四氧化三锰一维核壳结构复合材料并将其作为超级电容器电极材料。结果表明,在0.5M Na_2SO_4水溶液中,该复合材料表现出高的比电容(在扫速为5 m V s-1时比电容为200.7 F g~(-1),在电流密度为0.25 A g~(-1)时比电容为203.0 F g~(-1))和理想的循环稳定性(在电流密度为1 A g~(-1)时,循环3000周之后,比容量保持率为73.8%)。
[Abstract]:Due to its good optical, electrical, thermal and mechanical properties, silver nanowires and their complexes are widely used in flexible transparent conductive films, catalysts, sensors, energy conversion and storage. The preparation and application of silver nanowires have attracted wide attention. The main content of this thesis is the preparation of ultrafine silver nanowires and their composites and their applications in carbon dioxide electroreduction and supercapacitors. The main results obtained are as follows: (1) preparation of ultrafine silver nanowires using ethylene glycol and diethylene glycol as solvent in PVP (polyvinylpyrrolidone) and control agents (NaCl and KBrs). In existence, one-step polyol method was used. Silver nanowires with an average diameter of 30 nm or greater than 1000 were successfully prepared. At the same time, the mixture of ethylene glycol and diethylene glycol or triethylene glycol and their mixture as solvent and reductant were prepared. The effect of reductivity and viscosity of polyol on the morphology of the final silver nanomaterials was studied. Study on the performance of silver nanowire electrode as self-supporting carbon dioxide electroreduction catalyst the silver nanowires prepared are self-supporting electrodes. The electrocatalytic reduction of carbon dioxide was studied. The selectivity of Ag nanowire self-supporting electrode for electrocatalytic reduction of carbon monoxide from carbon dioxide to carbon monoxide at a voltage of -0.9V (relative to the reversible hydrogen electrode) is about 80%. Preparation of Silver nanowires and Manganese trioxide Core-Shell Composites and their Properties as electrode Materials for Supercapacitors by simple Chemical Synthesis method. One-dimensional core-shell structure composites of silver nanowires and manganese trioxide were successfully prepared and used as electrode materials for supercapacitors. The results showed that silver nanowires were used in 0.5m Na_2SO_4 aqueous solution. The composite exhibits a high specific capacitance (200.7 F / g ~ (-1) at a sweep speed of 5 MV / s ~ (-1)). When the current density is 0.25 A / g ~ (-1), the specific capacitance is 203.0 F / g ~ (-1) and the ideal cycle stability is (1 A / g ~ (-1)). After 3000 weeks of circulation, the specific volume retention rate was 73.8%.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1;TM53

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