臺灣博碩士論文加值系統

本實驗以兩階段合成法製備二氧化錳/石墨烯之複合材料電極(NGM)，並探討其超級電容特性。第一階段先藉由濕式化學法製備石墨烯電極(NG)，第二階段再利用水熱法將二氧化錳奈米薄片合成在石墨烯電極上，另外以水熱法合成二氧化錳電極(NM)作為對比實驗組。此外，藉由改變KMnO4濃度及水熱合成時間，我們仔細觀察合成之產物在實驗過程中形貌的演變並探討其成長機制，並根據循環伏安曲線，我們可以得到最佳超級電容特性之合成產物參數。其中，二氧化錳電極以及複合材料電極之最佳比電容值分別為334.12 F/g及726.67 F/g ，倍率性能則為48.51%及51.58%。經過1000次的循環穩定度測試後，二氧化錳電極以及複合材料電極之倍率性能分別為71.9%及82.1%。很明顯的，複合材料電極可以同時結合二氧化錳及石墨烯之合成效益，表現出良好的超級電容特性。

MnO2 nanoflakes/graphene were synthesized by hydrothermal and chemical wet methods. At first, graphene was synthesized on the nickel foam by chemical wet method. Then, MnO2 nanoflakes were synthesized on the graphene foam by hydrothermal process for comparison purpose. In comparison, MnO2 nanflakes were synthesis on the nickel foam by hydrothermal process. The samples were denoted as NG, NGM and NM, respectively. We changed the precursor concentration and synthesis time in the hydrothermal process to obtain NM and NGM to achieve the best capacitance performance. The specific capacitance of NM and NGM was to be 334.12 F/g and 726.67 F/g, respectively. The rate capability was 48.51% and 51.58%, respectively. After 1000 cycling tests, the specific capacitance retention was to showed 71.9% and 82.1% for NM and NGM, respectively. The NGM showed high specific capacitance and excellent cycle stability.

目次

摘要………………...…………………………………………………………………..i
Abstract………………………………….…………………………………………….ii
目次……………………………………………………………………………………iii
圖目次……………………………..………………………………………………….iv
表目次…………………………………...………………………………………..….vii

第一章 緒論……………………………………….……………………………….…1
第二章 文獻回顧………………………………………….……………………….…2
2.1. 超級電容…………………………………………….…………...……..2
2.1.1. 電雙層電容.…………………….……………...………….….....5
2.1.2. 擬電容.…………………...…….………………………….….....9
2.2. 電雙層電容之電極材料………………………...……….……………11
2.3. 擬電容之電極材料……………………………………………..…….16
2.4. 無接合劑添加之製程………………….…………………………...…22
2.5. 研究動機與目的…………………………………......……………..…25
第三章 實驗方法與步驟…………………………………………...…………….…26
3.1. 實驗流程……………………………...……………………………….26
3.2. 合成方法………………….……………………………...……………27
3.2.1. 石墨烯電極(NG)之製備.……..………………………….…....27
3.2.2. 二氧化錳電極(NM)之製備……………………………………27
3.2.3. 複合材料電極(NGM)之製備………………………………….28
3.3. 材料特性分析……………………..……………………………...…...28
3.4. 超級電容電極元件………………………………….……………...…28
第四章 結果與討論……………………….…………………………………..…….30
4.1. 石墨烯電極(NG)之製備……………………………………......…….30
4.2. 二氧化錳電極(NM)及複合材料電極(NGM)之製備………………...35
4.2.1. 不同前驅物濃度對二氧化錳電極(NM) 及複合材料電極(NGM)之影響…….…………………………………………………………...35
4.2.2. 二氧化錳電極(NM)及複合材料電極(NGM)之成長機制……40
4.3. 超級電容特性測試………....................................................................44
第五章 結論................................................................................................................57
參考文獻……………………………………………………………………………..58

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