研究生: |
蔡承佑 Chen-Yu Tsai |
---|---|
論文名稱: |
高導電耐腐蝕鈦基氧化物載體承載鉑觸媒於氧還原反應之研究 Study on highly conductive and anti-corrosion Ti oxide supported Pt catalysts for oxygen reduction reaction |
指導教授: |
黃炳照
Bing-Joe Hwang |
口試委員: |
陳景翔
none 蘇威年 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 202 |
中文關鍵詞: | 高導電性 、TEOS處理方法 、氧氣還原反應 |
外文關鍵詞: | Highly-conductive, TEOS method, Oxygen reduction reaction |
相關次數: | 點閱:501 下載:1 |
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本研究製備高導電性二氧化鈦(TiO2)作為載體並承載鉑(Pt)觸媒,進行陰極氧氣還原反應的探討。首先,以溶熱法(solvothermal)製備奈米級TiO2,利用TEOS處理方法將SiO2包覆TiO2顆粒,以抑制氫氣還原熱處理過程中TiO2顆粒的聚集。
電化學活性測量的結果發現,有TEOS處理且在850oC下,經氫氣還原熱處理的TiO2載體上(20%Pt/850FATST) 承載之Pt觸媒有較好的氧氣還原電催化活性。在0.9 V (vs NHE)下的電流密度為0.2075 mA/cm2,此歸因於有TEOS處理之TiO2載體,在熱處理後保持較高之表面積和良好的導電度,且由X光吸收光譜的結果證實,20%Pt/850FATST中Pt觸媒5d軌域電子較飽滿,此有助於提升氧氣還原電催化能力,而相較於同系列其他觸媒,具有最佳氧氣還原電催化能力。電化學穩定性測試顯示20%Pt/850FATST觸媒相較於JM20,有較佳的電催化穩定性及抗腐蝕能力。
In this work, highly-conductive TiO2 supported Pt catalysts were prepared for improving the electrochemical performance of oxygen reduction reaction (ORR). First, TiO2 nanoparticles were synthesized by a solvothermal method, and followed by SiO2 coating the TiO2 nanoparticle surface by using the tetraethylorthosilicate method (TEOS) in order to inhibit the particle growth during thermal treatment.
The electrochemical performance shows that the TiO2 support, treated by TEOS process and H2 reduction at 850℃, supported Pt catalyst (20%Pt/850FATST) exhibits the better activity in which the catalyst possesses a maximum specific current density of 0.2075 mA/cm2 at 0.9 V (vs. NHE) in the ORR. Such performance is attributed to the higher surface area remain for treated TiO2 and the improved electrical conductivity. Moreover, X-ray absorption spectroscopy (XAS) demonstrates that a higher electronic population of the Pt 5d-orbital for 20%Pt/850FATST which can improve the ORR activity, compared to the other series of the catalysts. Durability test shows that 20%Pt/850FATST has better stability and anti-corrosive ability compared to the commercial Pt catalyst (JM20).
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