二氧化錳奈米微粒/碳黑複合電極之研究

Study on the MnO2 Nanoparticles/Carbon Black for Supercapacitor Electrodes

朱是駿(Shr-jiun Ju)

指導教授 ： 胡毅

大同大學/工程學院/材料工程學系所/碩士(2005年)

摘要

二氧化錳因具有優良的擬電容特性，適用於超高電容器之研究與應用。本實驗使用過錳酸鉀及反丁烯二酸以溶膠凝膠法製備二氧化錳奈米微粒並混合碳黑製作複合電極。首先對所製備粉末以DTA-TGA進行熱分析，再利用XRD研究其組成及粒徑，並以SEM觀察粉末的表面形貌。使用EPR得到氧化錳晶體中未成對電子之自由基或順磁性物質的電子順磁共振光譜，以研究其鍵結趨勢。並將所製作的複合電極以改變不同參數(含氧化錳/碳黑混合比、掃描速率、電極基材、熱處理溫度及摻雜物)進行三極循環伏安測試來研究其電化學性質。實驗結果顯示，以100℃熱處理的氧化錳粉末與碳黑依重量比3：1混合，並以不鏽鋼網為基材所製的複合電極在0.1M Na2SO4中，5mV/s的掃描速率下，得到比電容值158.39F/g，換算得到最大氧化錳比電容值211.18F/g。

關鍵字

二氧化錳 ； 擬電容 ； 超級電容

並列摘要

The manganese dioxide is applicable to the research and the application of the extremely high capacitor because of having to draw up the electric capacity characteristic goodly. The experiment uses sol-gel method with the potassium manganate and fumaric acid to have manganese dioxide Nano particle to also mix with the carbon black manufacture the compound electrode. First to make to have the powder to carry on the hot analysis with the DTA- TGA, then make use of the XRD to study it constitutes and particle size, and observe the surface of the powder with the SEM. Using the EPR gets the paramagnetic resonance spectrum of the electron free radicals of manganese oxide crystal or the paramagnetic material, to study its chemical bonding. And manufacture of compound electrode to change the different parameter( the mixing ratio of manganese oxide/carbon black, scan rate, electrode base material, hot processing temperature and various dopen) and carry on the CV testing to study its electrochemical characteristics. The manganese oxide after heating 100℃ mixes with 25wt.％ carbon black , stainless steel net as electrode base material, having the maximum specific capacitance of 158.39 F/g at a scan rate of 5mV/s in 0.1M Na2SO4 .

並列關鍵字

manganese oxide.sol-gel ； supercapacitor

參考文獻

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