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標題: | 氮化鈷與奈米碳管複合材料應用於鋰氧電池陰極觸媒 Cobalt Nitrite Combined with Carbon Nanotube for Lithium-O2 Battery Cathode Catalysts |
作者: | Ri-Xin Ye 葉日新 |
指導教授: | 劉如熹(Ru-Shi Liu) |
關鍵字: | 鋰氧電池,OER陰極觸媒,鋰空氣電池, Lithium-oxygen battery,OER cathode electrocatalysts,Lithium air battery, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 工業革命帶動科技發展與提升人類生活水平,當使用火力與煤炭作為動力來源,滿足能源需求之同時,大量碳排放卻造成全球暖化危機。若欲地球永續發展,綠能發電勢在必行。由風能、核能至太陽能,此些綠能研究之創新與突破,已為人類帶動全新能源革命。能源產生,須有裝置將其儲存,鋰氧電池(lithium oxygen battery)因具能量密度大與高電容量之優點,已成為近十年極具潛力之儲能裝置。
本研究合成氮化鈷(cobalt nitrite)複合奈米碳管(carbon nanotube)作為鋰氧電池陰極觸媒。奈米碳管具良好導電與熱穩定性,其高表面積亦助於儲存放電後之過氧化鋰(lithium peroxide)。氮化鈷表面具有零價與三價之鈷金屬,充電時,將輔助過氧化鋰分解。 本研究藉由X光粉末繞射儀(X-ray diffraction spectroscopy; XRD)、同步輻射X光吸收光譜(X-ray absorption spectroscopy; XAS)與X射線光電子能譜儀(X-ray photoelectron spectroscopy; XPS)鑑定觸媒晶格與價數;以掃描式電子顯微鏡(scanning electron microscope; SEM)與穿透式電子顯微鏡(transmission electron microscopy; TEM)觀測表面與內部之形貌;並使用循環伏安法(cyclic voltammetry; CV)與電化學交流阻抗法(electrochemical impedance spectrum; EIS)探測觸媒電化學活性;最後利用充放電機量測電池電容量與循環穩定性。經上述鑑定,氮化鈷/奈米碳管複合材料有助於降低鋰氧電池充放電之過電壓,且具良好之循環穩定性。 The industrial revolution led to the development of science and technology, thereby enhancing human living standards. While the use of fire and coal as power source satisfied people’s energy needs, the large number of carbon emissions have derived on a global warming crisis. For the sustainable development of our environment, green power is imperative. Research on the innovation of green energies has driven a whole new revolution for mankind. When energy is generated, there must be a device to store it. Lithium oxygen battery, with the advantages of high energy density and capacity, has become a promising energy storage device in this recent decade. In this study, we synthesized cobalt nitrite combined with carbon nanotubes as cathode catalysts for lithium oxygen batteries. Carbon nanotubes possess excellent conductivity and thermal stability. Besides, their large surface area helps store lithium peroxide, the discharge product. During charge, Co and Co3+ on the surface of cobalt nitrite will help decompose lithium peroxide. X-ray diffraction spectroscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy were conducted to identify crystal lattice and valence of catalysts. Scanning electron microscope and transmission electron microscopy were used to observe the inner and outer morphology of the catalysts. Cyclic voltammetry and electrochemical impedance spectroscopy were operated to detect electrochemical activity. Finally, battery capacity and cycle stability were tested by galvanostatic discharge/charge process. The above-mentioned techniques demonstrated the outstanding cycle stability and decreased overpotential during discharge and charge that was efficiently achieved in lithium oxygen batteries by the combination of cobalt nitrite with carbon nanotubes. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/59429 |
DOI: | 10.6342/NTU201701048 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學系 |
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