| 研究生: |
葉德夫 Yeh, Te-Fu |
|---|---|
| 論文名稱: |
不同氧化程度石墨烯光觸媒由水產氫及氧之研究 Graphite Oxide with Different Oxygenated Levels for Hydrogen and Oxygen Production from Water under Illumination |
| 指導教授: |
鄧熙聖
Teng, Hsi-Sheng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 120 |
| 中文關鍵詞: | 氧化石墨烯 、光觸媒 、分解水 、產氫 、電子結構 |
| 外文關鍵詞: | Graphite oxide, photocatalysis, water splitting, hydrogen production, electronic structure. |
| 相關次數: | 點閱:133 下載:8 |
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本研究利用改進式 Hummers 法製備氧化石墨烯(GO)半導體光觸媒。由石墨的氧化所製備之氧化石墨烯光觸媒隨著氧化程度不同而具有不同的電子特性。吸收光譜顯示,氧化石墨烯之含氧量將直接影響能隙大小,含氧量越多具有較大之能隙。電化學分析搭配Mott-Schottky公式可定出氧化石墨烯之價帶、導帶以及費米能階。結果顯示,適當氧化程度之氧化石墨烯同時具有氧化及還原水之電子結構。導帶能階位置並未受到氧化程度不同有劇烈的位移,而主導能隙大小為價帶能階之位移。
不同氧化程度之氧化石墨烯分別在甲醇及硝酸銀水溶液測試其產氫及產氧之光催化活性。在照光期間,氫氣隨著時間大量且穩定產生。由於互相的光催化還原,使氧化石墨烯之價帶往上移動,因此氧氣產量非常小。然而,利用碘酸鈉當犧牲試劑做光化學反應,可以抑制氧化石墨烯互相還原,並增加其氧氣產量。這項研究結果證實,化學的改質氧化石墨烯可以改變其電子特性,並可應用於光電化學領域。
A graphite oxide (GO) semiconductor photocatalyst is synthesized by modified Hummers’ procedure. Graphite oxide photocatalysts derived from graphite oxidation can have varied electronic properties by varying the oxidation level. Absorption spectroscopy shows the increasing band gap of GO with the oxygen content. Electrochemical analysis along with the Mott-Schottky equation show that the conduction band and valence band edge levels of GO from appropriate oxidation are suitable for both the reduction and oxidation of water. The conduction band edge shows little variation with the oxidation level, and the valence band edge governs the bandgap width of GO. The photocatalytic activity of GO specimens with various oxygenated levels was measured in methanol and AgNO3 solutions for evolution of H2 and O2, respectively. The H2 evolution was strong and stable over time whereas the O2 evolution was negligibly small due to mutual photocatalytic reduction of the GO with upward shift of the valence band edge under illumination. When NaIO3 was used as a sacrificial reagent to suppress the mutual reduction mechanism under illumination, strong O2 evolution was observed over the GO specimens. The present study demonstrates that chemical modification can easily modify the electronic properties of GO for specific photosynthetic applications.
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