奈米碳管紙之製備及其作為海水電池陰極放電研究

Preparation and characterization of carbon nanotube papers as cathode materials for seawater battery

陳楷軒(Chen, Kai Hsuan)

指導教授 ： 徐文光

國立清華大學/工學院/材料科學工程學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00196

摘要

電極材料特性在電化學研究上扮演一個重要的角色。例如電容器上的電流收集器儲存電荷能力(比電容)、電池的放電能力及穩定性等都是針對電極材料作研究。很多研究針對陰極材料的選擇或製程上的不同做分析，如在相同材料上添加特殊的材質等，目的就是要有更大的比表面積以及循環壽命穩定的提升。碳管紙纖維材料也是近年來很熱門的材料，質量輕、具有可撓性同時因為和碳管結合而具有一定的強度，以及製造簡單成本低等優點，對於未來的可撓式裝置電池材料有著極大的發展潛力。在實驗中，我們使用酸化奈米碳管以及經由強鹼反應過後的碳管當作碳管紙原料，和紙漿混和製成碳管紙使碳管在紙纖維上均勻分布提升比表面積增加比電容值。在海水電解液的部分使用碳管紙當作陰極，以AZ61鎂鋁合金當作陽極反應放電，可以使LED元件長時間穩定發亮。在碳管結構以及材料表面形貌由拉曼光譜以及場發式電子顯微鏡觀察。在電化學性質量測部分，包含比電容值計算、倍率性能、電化學阻抗以及海水電池放電測試。最後將製備原料-碳管懸浮液進行粒徑大小分析、分散性指數以及Zeta電位量測來驗證改質奈米碳管的性質。

關鍵字

海水電池 ； 奈米碳管

並列摘要

Electrodes play an important role in determining the performance of electrochemistry properties, such as specific capacitance of supercapacitors and discharging capability of batteries. Recent studies focus on cathode materials and found that carbon nanotube papers are one of potential cathode materials because of their light weight and low cost. Papers are flexible and may replace metal based cathodes for flexible mobile devices as well as tablet PC in the future. Here acid treated multi-walled carbon nanotubes (MWCNTs) are mixed with normal paper to form conductive papers. By upgrading specific area, we obtain a greater specific capacitance and scan current. For seawater batteries, carbon nanotube papers are used as cathode materials and magnesium alloy (AZ61) as anode. Electrons are released from alloy through oxidations and are then collected by carbon nanotube papers, resulting in H2 generation at cathode. Batteries discharge stably for a small current which is sufficient to power LEDs over 24 h. The physical properties and morphologies of carbon nanotube papers are characterized by field emission scanning electron microscopy (FE-SEM) and Raman measurement. The electrochemical properties, including capacitance, rate capability, discharge test, electrochemistry impedance spectrum analysis, and linear sweep voltammetry, are also studied. Finally, electrochemical properties of carbon nanotube paper are measured by zeta-sizer instrument to uncover the zeta potential, polydispersity index and particle diameter analysis.

並列關鍵字

seawater battery ； carbon nanotube

參考文獻

40. 李珠, 感應耦合電漿質譜儀技術及其在材料分析上的應用. 2002.

29. Hu, L.; Choi, J. W.; Yang, Y.; Jeong, S.; La Mantia, F.; Cui, L.-F.; Cui, Y., Highly conductive paper for energy-storage devices. Proceedings of the National Academy of Sciences 2009, 106 (51), 21490-21494.

22. Hasvold, Ø.; Henriksen, H.; Melv˦r, E.; Citi, G.; Johansen, B. Ø.; Kjønigsen, T.; Galetti, R., Sea-water battery for subsea control systems. Journal of Power Sources 1997, 65 (1–2), 253-261.

1. Iijima, S., Helical microtubules of graphitic carbon. nature 1991, 354 (6348), 56-58.

3. De Heer, W. A., Nanotubes and the pursuit of applications. MRS bulletin 2004, 29 (04), 281-285.