臺灣博碩士論文加值系統

本研究利用波長450 nm、532 nm以及808 nm之雷射，照射不同晶面的銀奈米晶體，探討其應用於析氫反應之光電催化活性。由於侷域化表面電漿共振現象，銀奈米十四面體在波長450 nm之雷射的照射下，其析氫效率有所提升，電流密度值從原本的-20.23 mA/cm2增加至-20.50 mA/cm2，產生了0.27 mA/cm2的光電流密度。而在犧牲試劑的作用之下，光電流密度則可達到0.403 mA/cm2。
在不同形狀之銀奈米晶體的光電催化效率探討中，以銀奈米八面體的表現最佳。相較於銀奈米立方體與銀奈米十四面體的光電流密度值(分別為7.5×〖10〗^(-6)和1.5×〖10〗^(-5) mA/cm2·mW)，銀奈米八面體具有最高的光電流密度(6.8×〖10〗^(-5) mA/cm2·mW)。這是由於比起[100]晶面，氫原子較易吸附在銀奈米晶體的[111]晶面。所以，於[111]晶面上，氫分子較容易被生成出來，進而造成電流密度的提升。因此，[111]晶面的銀奈米八面體，應用於析氫反應，具有出色的光電催化效率。

The facet-dependent photoelectrocatalytic activities of silver nanocrystals on carbon fiber paper (CFP) were investigated for hydrogen evolution reaction (HER) under the laser irradiation at wavelengths of 450, 532 and 808 nm, respectively. Under the laser irradiation at wavelength of 450 nm, the hydrogen generation of silver cuboctahedra was improved due to localized surface plasmon resonance (LSPR), that the current density was shift from -20.23 to -20.50 mA/cm2 and the photocurrent density was reached to 0.27 mA/cm2. Furthermore, photocurrent density of silver cuboctahedra was increased from 0.270 to 0.403 mA/cm2 by the assist of hole scavenger. Among different shapes of silver nanocrystals, silver octahedra exhibited the best performance for the photoelectrocatalysis. Compared with the photocurrent density of silver nanocubes and silver cuboctahedra (7.5×〖10〗^(-6) and 1.5×〖10〗^(-5) mA/cm2·mW respectively), the photocurrent density of silver octahedral (6.8×〖10〗^(-5) mA/cm2·mW) was highest. The reason can be ascribed that the adsorption of hydrogen atom on the planar [111] surface of silver nanocrystals is easier than [100]. Therefore, hydrogen can be produced more effectively on the [111] surface to result in the increase of current density. Overall, the silver octahedra with the [111] surface showed the high efficiency for photoelectrocatalysis in HER application.

第一章 緒論...1
1-1 奈米科技的起源與發展...1
1-2 奈米材料的簡介...3
1-2-1 奈米材料的製成方法...3
1-2-2 奈米材料的性質...7
1-2-3 奈米材料的應用...12
1-3 金屬奈米材料與侷域化表面電漿共振現象...15
第二章 文獻回顧與研究動機...17
2-1 金屬奈米光觸媒...17
2-2 觸媒之晶面對於催化反應的影響...24
2-3 銀奈米晶體...30
2-4 研究動機與目的...34
第三章 實驗設備與步驟...35
3-1 實驗藥品...35
3-2 實驗儀器設備介紹...36
3-2-1 高速離心機...36
3-2-2 恆定電位/電流分析儀...36
3-2-3 銀/氯化銀電極...37
3-2-4 雷射光源...37
3-3 分析儀器介紹及其基本原理...40
3-3-1 紫外光/可見光/近紅外光光譜儀...40
3-3-2 穿透式電子顯微鏡...41
3-3-3 掃描式電子顯微鏡...42
3-4 實驗步驟...43
3-4-1 銀奈米晶體之合成...43
3-4-2 銀奈米晶體之純化...45
3-4-3 銀奈米晶體之碳紙樣品製備...45
3-4-4 電化學之測量...46
第四章 結果與討論...48
4-1 材料與工作電極之特性分析...48
4-1-1 銀奈米晶體之形貌與光學性質...48
4-1-2 碳紙樣品之鑑定...49
4-2 電化學分析...51
4-2-1 碳紙樣品之材料負載量最佳化...52
4-2-2 犧牲試劑之濃度最佳化...53
4-2-3 激發光源之功率與波長對於光電催化表現的影響...54
4-2-4 銀奈米晶體之晶面對於光電催化效率的影響...58
第五章 結論與未來展望...61
參考文獻...62

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36. 科技創意產業發展, 楊啟榮, 台灣師範大學機電科技研究所
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