The Role of Cu(I) Species for Photocatalytic Hydrogen Generation Over CuOx/TiO2
The Role of Cu(I) Species for Photocatalytic Hydrogen Generation Over CuOx/TiO2
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DOI：
10.1007/s10562-009-0165-y
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发表时间：
2009-09
影响因子：
2.8
通讯作者：
Yuqi Wu;Gongxuan Lu;Shuben Li
中科院分区：
文献类型：
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作者：
Yuqi Wu;Gongxuan Lu;Shuben Li
在tio2上制备了Cu(0)、Cu(I)和Cu（II）三种CuOxspecies，并研究了它们在光致制氢中的作用。结果表明，CuOxcenter中的正电荷对光诱导电荷转移有显著影响。Cu(I)促进光电流的产生，而Cu（II）抑制光电流的产生。光活性顺序类似。低温焙烧有利于Cu(I)种的形成，高温焙烧有利于Cu（II）种的形成。在低负荷水平下，Cu含量增加导致活性增加，但Cu超载导致产氢活性降低。详细分析表明，Cu（II）中心的形成与Cu（II）中心的形成有关，从而导致产氢活性降低。Cu(0)的种类在低负荷水平下对活性影响不明显，在高负荷水平下则有不利影响。铜的最佳添加量为1.0Cu （wt%）。
The fabrication of different CuOxspecies (Cu(0), Cu(I) and Cu(II) species) over TiO2has been accomplished and their roles in photoinduced hydrogen generation have been investigated. The results indicate that the positive charge in CuOxcenter affect photo-induced charge transfer significantly. Cu(I) species seems promote photocurrent generation while the Cu(II) species inhibits the photocurrent generation. Photoactivity order follows the similar sequence. Lower temperature calcination helps the formation of Cu(I) species and higher temperature treatment leads to the formation of Cu(II) species. At the lower loading level, the Cu content increase leads to the activity increase, but over loading of copper resulted in the decrease of activities for hydrogen generation. Detail analysis indicates that too much copper loading induces more Cu(II) center formation, as a results, the activity for hydrogen generation decreases. The species of Cu(0) does no affect the activity obviously at low loading level and shows detrimental effect at high loading level. The optimal loading amount of copper is 1.0Cu (wt%).