化石燃料的枯竭以及全球暖化現象加劇，促使乾淨的替代性能源成為當前急需研究之項目，而電化學分解水產氫產氧因為其產物氫氣具有高能量密度，且燃燒後僅會產生純淨的水與熱量，因此無疑是最受矚目的研究之一。到目前為止，產氫的最佳觸媒為白金(Pt)，而產氧的最佳觸媒為二氧化釕(RuO2)和二氧化銥(IrO2)。然而，上述這些貴重金屬在地殼上因其蘊含量極為稀少，價格居高不下，因此難以大量用來製造觸媒，在商業化發展上有諸多限制。因此，研究出以非貴重金屬為基底之電化學觸媒為是電化學產氫產氧領域中最重要的課題。而電化學分解水中，產氧反應是速率決定步驟，因此又以產氧反應之研究更為重要。
在產氧反應中，鐵鈷錳等過渡金屬及其衍生物被視為最有潛力之非貴重金屬催化劑，並且因地殼中含量豐富且價格低廉等原因，使其被應用在許多電化學領域之中。本研究中，使用鈷氰化鉀、醋酸鈷及檸檬酸鈉作為前驅物，並改變其中檸檬酸鈉添加量，成功合成出不同尺寸的鈷之類普魯士藍(Co-Prussian blue analogues, Co-PBA)。接著將鈷之類普魯士藍以滴落塗佈法(drop-casting)分散於經前處理過的氟摻雜氧化錫玻璃(Fluorine-doped Tin Oxide, FTO)上，並以電鍍法固定觸媒前驅物，再通過空氣環境下高溫氧化後，鈷之類普魯士藍轉化成由氮摻雜之碳層包覆之四氧化三鈷奈米方塊(Co3O4@N-C)，作為進行電催化分解水之產氧電極。
經過電鍍時間、氧化溫度及觸媒質量負載之參數調整，我們得到一最佳化參數之電極。在電化學表現上，於0.5 M H2SO4中之產氧反應達10 mA/cm2電流密度所需過電位(overpotential)為465 mV，塔佛斜率(Tafel slope)為164 mV/dec，並且可在10 mA/cm2的電流密度中穩定至少12小時，表現出其良好的穩定性，期許能在未來應用於商業發展上，為地球發展綠色能源貢獻一份微薄的努力。

Because of fossil fuels depletion and global warming, development of clean alternative renewable energy has been considered as the first priority for everlasting development of mankind on Earth. Hydrogen production through electrochemical water splitting is undoubtedly the most promising technology, because hydrogen possesses high energy densities and produces only water and heat after combustion. Besides, the other product of water splitting is oxygen, which is also a useful gaseous chemical. Until now, the most effective catalyst for electrolytic hydrogen production is platinum (Pt), and the best catalyst for electrolytic oxygen production is ruthenium dioxide (RuO2) or iridium dioxide (IrO2). However, the scarcity and extremely high cost of Pt, Ru, and Ir limit their applications in large scale hydrogen production. Therefore, development of non-precious-metal based catalysts for electrolytic water splitting is in critical demand, especially the development of catalysts for the oxygen evolution reaction (OER), which is the bottleneck reaction in electrochemical water splitting.
Transition metals, including iron (Fe), cobalt (Co), and manganese (Mn), and their derivatives are considered as promising catalysts for OER in acidic media because they are Earth-abundant and low cost. In this study, we used potassium hexacyanocobaltate(III), cobalt(II) acetate tetrahydrate, and trisodium citrate dihydrate as precursors to synthesize Co-Prussian blue analogues (Co-PBA). The size of Co-PBA was controlled with addition amounts of trisodium citrate dihydrate. The Co-PBA was drop-cast onto a pre-treated FTO, and fixed on the FTO with an electrodeposition method. Subsequently, the Co-PBA was converted into N-doped carbon coated Co3O4 nanocubes with calcination in air to serve as an electrode for the OER
The N-doped carbon coated Co3O4 nanocubes based electrode was optimized with electrodeposition time, calcination temperature, and catalyst mass loading. Electrochemical performances of the catalyst electrode were evaluated in a 0.5 M H2SO4 electrolyte. The Co3O4@N-C/FTO electrode achieved an overpotential of 465 mV at the current density of 10 mA/cm2, and a Tafel slope of 164 mV/dec. Besides, for stability tests, Co3O4@N-C/FTO remained stable for at least 12 hours at a current density of 10 mA/cm2, indicating the good stability of the catalyst electrode.

摘要 I
Abstract II
致謝 IV
總目錄 V
圖目錄 VIII
表目錄 XI
第一章 緒論 1
1.1 前言 1
1.2 電催化分解水反應機制 2
1.3 三極式電化學量測系統 5
1.3.1 電解質 6
1.3.2 對電極 6
1.3.3 參比電極 6
1.3.4 三極式電化學量測系統架設 8
1.3.5 過電位量測 8
1.4 常見的OER觸媒 9
1.4.1 貴重金屬材料 9
1.4.2 非貴重金屬材料 9
1.5 研究動機 10
第二章 文獻回顧 12
2.1 金屬鐵之衍生物於酸性OER之應用 12
2.2 金屬鈷之衍生物於酸性OER之應用 18
2.3 金屬錳之衍生物於酸性OER之應用 21
第三章 實驗方法 24
3.1 實驗藥品 24
3.2 實驗器材 25
3.3 材料分析儀器 26
3.4 實驗方法與步驟 28
3.4.1 導電基材之前處理 28
3.4.2 合成Co-PBA 28
3.4.3 以電鍍法固定Co-PBA於FTO上 29
3.4.3 以高溫氧化製備電極Co3O4@N-C/FTO 30
3.4.4 以黏著劑Nafion製備電極Co3O4@N-C/Nafion/FTO 30
3.5 電化學性質量測 30
3.5.1 OER之過電位量測 31
3.5.2 電化學活性面積測試 31
3.5.3 電化學阻抗圖譜測量 31
3.5.4 長效穩定性測試 ( long-term stability test ) 32
第四章 結果與討論 33
4.1 鈷之類普魯士藍衍生物之材料分析 33
4.1.1 鈷之類普魯士藍與其氧化物 33
4.1.2 以不同電鍍時間(20/40/60 s)製備電極 39
4.1.3 以不同氧化溫度(400/500/600°C)製備電極 42
4.2 Co-PBA與其氧化物之電化學活性分析 45
4.2.1 觸媒以不同方式固定於FTO上之電化學表現 45
4.2.2 不同電鍍時間(20/40/60 s)製備電極之電化學表現 47
4.2.2 不同氧化溫度(400/500/600°C)製備電極之電化學表現 51
4.2.3 不同觸媒質量負載(0.5/1.0/1.5 mg/cm2)製備電極之電化學表現 56
4.2.4 Co3O4@N-C/FTO長效性測試 59
第五章 結論 65
第六章 參考文獻 66

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