Highly stable CuO incorporated TiO2 catalyst for photocatalytic hydrogen production from H2O
Highly stable CuO incorporated TiO2 catalyst for photocatalytic hydrogen production from H2O
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DOI：
10.1039/b507816d
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发表时间：
2005-01-01
影响因子：
3.1
通讯作者：
Rajapakse, CSK
中科院分区：
文献类型：
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作者：
Bandara, J;Udawatta, CPK;Rajapakse, CSK
CuO掺入的TiO 2催化剂被发现是一种活性光催化剂，用于在牺牲条件下还原H2O。的催化活性源于光生的激发电子在两个TiO 2和CuO的导带中，导致在CuO的导带中的过量电子的积累。因此，过量电子在CuO中的积累引起CuO的费米能级的负位移。有效的粒子间电荷转移导致更高的催化活性和高度还原态的TiO 2/CuO的形成，这是稳定的，即使在氧饱和条件下。催化剂TiO 2/CuO的CuO的费米能级的负移获得了有效水还原反应所需的所需过电压。CuO的功能是帮助电荷分离并充当水还原位点。结果表明，CuO的含量和晶体结构对催化剂的活性有重要影响，CuO的最佳负载量为约100 g/L。类似于5-10%（w/w）。
A CuO incorporated TiO2 catalyst was found to be an active photocatalyst for the reduction of H2O under sacrificial conditions. The catalytic activity originates from the photogeneration of excited electrons in the conduction bands of both TiO2 and CuO resulting in a build-up of excess electrons in the conduction band of CuO. Consequently, the accumulation of excess electrons in CuO causes a negative shift in the Fermi level of CuO. The efficient interparticle charge transfer leads to a higher catalytic activity and the formation of highly reduced states of TiO2/CuO, which are stable even under oxygen saturated condition. Negative shift in the Fermi level of CuO of the catalyst TiO2/CuO gains the required overvoltage necessary for efficient water reduction reaction. The function of CuO is to help the charge separation and to act as a water reduction site. The amount of CuO and crystalline structure were found to be crucial for the catalytic activity and the optimum CuO loading was ca. similar to 5-10% (w/w).