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starfry

木虫 (小有名气)

[交流] [求助]请教一篇光催化文献

最近翻到一篇Kudo 2006年的文章
Iwase, A., H. Kato, and A. Kudo, Nanosized Au particles as an efficient cocatalyst for photocatalytic overall water splitting. Catalysis Letters 2006 108  p. 6.

其中提到把金加在NaTaO3:La上 活性可以大幅提升,但是两个小时左右开始失活
文章中解释如下:
It was thus revealed that the deactivation observed for Au(1 wt%)-loaded
NaTaO3:La in photocatalytic overall water splitting was not due to the back-reaction between evolved H2 and O2 but to the photoreduction of O2 on the Au cocatalyst.

请问photoreduction of O2 on the Au cocatalyst 是指什么意思?
是指O2得到电子变成O2-  然后与Au形成Au2O3 or 其他Au氧化物吗?
想了很久还是觉得奇怪,上来跟大家讨论讨论
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haha123123

金虫 (小有名气)


nxl5096224(金币+1,VIP+0):谢谢参与讨论~
i think you may dip in a wrong way of thinking , here,  the function of  Au  just like pt catalyst , in the presence of Pt, the back reaction, H2+ O2= H2O ,could take place, while Pt itself doesnot attend in this reaction.
2楼2007-12-27 22:15:23
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starfry

木虫 (小有名气)

但是文中已经说 : [was not] due to the back-reaction between evolved H2 and O2 ..
所以才觉得奇怪
3楼2007-12-28 00:57:55
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haha123123

金虫 (小有名气)

O2 + e- = O2'-  and futher to produce other oxidative species such as OH.
but this reduction reaction takes place without H2 , so it is different from that back reaction
4楼2007-12-28 13:11:29
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