本文關(guān)鍵詞：超細(xì)銀納米線制備及其在電催化與超級電容器方面的應(yīng)用研究　出處：《天津理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 銀納米線 能量轉(zhuǎn)換與存儲 二氧化碳電還原 超級電容器 電化學(xué)性能

【摘要】：由于良好的光學(xué)、電學(xué)、熱學(xué)和機(jī)械性質(zhì),銀納米線及其復(fù)合物在柔性透明導(dǎo)電膜,催化劑,傳感器,以及能量轉(zhuǎn)換與存儲等方面擁有廣泛的應(yīng)用。因此,銀納米線的制備及應(yīng)用開發(fā)受到了廣泛關(guān)注。本論文的主要內(nèi)容是超細(xì)銀納米線和其復(fù)合材料的制備及其在二氧化碳電還原和超級電容器方面的應(yīng)用,取得的主要研究結(jié)果如下:(1)超細(xì)銀納米線的制備以乙二醇和一縮二乙二醇混合作為溶劑在聚乙烯吡咯烷酮(PVP)及控制劑(NaCl和KBr)存在下通過一步多元醇法,成功制備了平均直徑為30nm長徑比大于1000的銀納米線。同時(shí),通過使用乙二醇和一縮二乙二醇或二縮三乙二醇及其兩者混合作為溶劑和還原劑,研究了多元醇的還原性及粘度對于最終銀納米材料形貌的影響。(2)銀納米線電極作為自支撐二氧化碳電還原催化劑性能研究以制備的銀納米線為自支撐電極,研究了其電催化還原二氧化碳性能。實(shí)驗(yàn)結(jié)果表明,銀納米線自支撐電極能夠在電壓為-0.9V(相對于可逆氫電極)時(shí)電催化還原二氧化碳為一氧化碳的選擇性約為80%。(3)銀納米線與四氧化三錳核殼復(fù)合材料的制備及其作為超級電容器電極材料性能研究通過簡單的化學(xué)合成方法,成功制備了銀納米線與四氧化三錳一維核殼結(jié)構(gòu)復(fù)合材料并將其作為超級電容器電極材料。結(jié)果表明,在0.5M Na_2SO_4水溶液中,該復(fù)合材料表現(xiàn)出高的比電容(在掃速為5 m V s-1時(shí)比電容為200.7 F g~(-1),在電流密度為0.25 A g~(-1)時(shí)比電容為203.0 F g~(-1))和理想的循環(huán)穩(wěn)定性(在電流密度為1 A g~(-1)時(shí),循環(huán)3000周之后,比容量保持率為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%.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1;TM53

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