研究生: |
劉奇杰 Chi-Chieh Liu |
---|---|
論文名稱: |
擬電容氧化錳承載之指叉式碳微管電極的微型化平面超高電容器 Planar miniaturized Ultracapacitor built on pseudocapacitive manganese oxide loaded on the interdigital pattern of carbon nanotubes |
指導教授: |
蔡大翔
Dah-Shyang Tsai |
口試委員: |
李奎毅
Kuei-yi LEE 呂宗昕 Chung-Hsin Lu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 140 |
中文關鍵詞: | 超高電容器 、指叉式電容器 、對稱 、非對稱 、氧化錳 、輸出功率 、奈米碳管 |
外文關鍵詞: | Ultracapacitor, Interdigital Electrode, symmetry, asymmetry, MnO2, Discharge Power, Carbon nanotube |
相關次數: | 點閱:364 下載:2 |
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摘 要
本研究藉由蝕刻/顯影技術、化學氣相沉積(CVD)及陽極電鍍法製備出圖形化氧化錳/碳微管複合電極,以構成指叉式微型超高電容器來探討指叉式原件之擬電容表現,以及有、無金之疊層對成長碳微管電極結構的影響,並以循環伏安、充放電、交流阻抗電化學實驗分析兩種疊層之對稱與非對稱式指叉超高電容器的電容及放電特性。
以化學氣相沉積法所成長出之碳微管可在無金疊層之指叉式電極上長出密度較高、比表面積較大之垂直式碳結構,其高度約可到達30 – 50 μm,其氧化錳會隨著垂直的碳微管出現直行的水滴式排列並具有尺寸相當一致的顆粒;而在有金疊層之指叉式電極則會因金的聚集效應導致鐵微粒子無法均勻散佈,成長出形貌較為疏散、不具規則性且高度較矮(1-2μm)之碳微管,使電鍍過程中氧化錳鍍在碳管表層,沒有進入碳管叢林沉積。
無金疊層之指叉電容器其性能表現受到電極內部阻抗所主宰,在慢的儲能速率下具有較高之電容值148 mF/cm2 (68.4F/g) 及較大的儲存能量628μJ,然而在快的儲能速率下其伏安圖型會傾斜與縮小並具有較大的能量損失,此外放電過程也會有電壓降(IR-drop)的出現;反之,有金疊層之電容器電阻對的影響較小,在快速的儲能過程中仍能呈現出氧化錳伏安掃描圖型特徵,在電容值的衰退上也較小,並可獲得較高輸出功率68μW、較佳的電極使用效率、較大的量測電流範圍且放電過程中不會出現電壓降的行為,但是含金之疊層會影響碳管之形貌及高度,使電容器有較小的電容值51 mF/cm2、儲存能量225μJ。
由對稱和非對稱式電極之電容特性分析結果顯示,非對稱式電極有較佳之儲電能力,隨著放電電流的增加亦具有較少的電容、極化損失及較大的輸出功率及儲存電能,於無金疊層之氧化錳/碳微管複合電極下其電容值及儲存能量可達到365 mF/cm2 (169F/g)、2200μJ、輸出高率為34μw皆較對稱式來的高出多,這種現象在金疊層之非對稱式電極也可發現,其儲存能量可達2089μJ。
關鍵詞:超高電容器、指叉式電容器、對稱、非對稱、氧化錳、輸出功率、奈米碳管。
ABSTRACT
In this master thesis, we report the preparation and properties of miniaturized ultracapacitors loaded with carbon nanotubes (CNT) and MnO2 in planar configuration. The interdigitated electrodes of these ultracapacitors with an electrode spacing of 20 μm, are fabricated using the standard technologies of photolithography, chemical vapor deposition, and electrodeposition, such that they can be readily integrated into the energy device of portable electronics. The correlation between the structure and energy storage property is studied with the symmetric and asymmetric electrodes, and the stack layer with and without gold. We measure the capacitance of electrodes using cyclic voltammetry (CV), while the energy and power of the cell with the galvanostatic charge-discharge experiment.
Although the gold addition in the Al-Fe stack layer decreases the resistance of stack layer, the structure of CNT array is severely affected as well. Without the Au incorporation, the CNT array on the Al-Fe stack layer is vertically aligned, densely populated with its number density > 109 cm-2. We may grow the interdigitated CNT bundle of height 30 – 50 μm, hence facilitate the establishment of MnO2-CNT electrodes with vertical side wall. On the other hand, the CNT on the Al-Fe-Au stack layer grows short, 1 – 2 μm, less populated and without vertical alignment. Hence the MnO2-CNT interdigital electrodes are ill defined in its electrode boundary and electrodeposited MnO2 seems to be present outside the entangled CNT forest.
For the ultracapacitor built on the Al-Fe stack layer, the resistance of stack layer plays an important role in its energy storage performance. The CV measurements indicate that the capacitance of symmetric electrode of CNT+MnO2 is 148 mF cm-2, but the capacitance decreases quickly with increasing sweep rate because of the higher resistance of stack layer. Similarly, the galvanostatic discharge measures the energy storage can be as high as 628 μJ, also decreases rapidly with increasing current. Meanwhile, the cell built on the Al-Fe stack layer also displays a larger IR drop. In contrast, for the ultracapacitor built on the Al-Fe-Au stack layer, the electrode capacitanace measures 51 mF cm-2, but the capacitance decreases at a relatively slow pace. The symmetric cell of CNT+MnO2 demonstrates a smaller energy capacity, 225 μJ, but a higher power output 68 μW, because of a more conductive stack layer.
Another crucial factor is whether the cell is symmetric with two comb-like electrodes of CNT+MnO2, or asymmetric with one electrode of CNT+MnO2 and another electrode of CNT. The asymmetric cell always exhibits a superior capacitor performance, regardless its stack layer. The maximum energy of the asymmetric cell on Al-Fe stack is measured 2200μJ, and the maximum power 34μW. The maximum energy of the asymmetric cell on Al-Fe-Au stack is similar in magnitude, 2089μJ, and the maximum power is slightly higher, 37μW.
Keywords: Ultracapacitor; Interdigital Electrode; symmetry; asymmetry; MnO2; Discharge Power; Carbon nanotube
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