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chinlly

新虫 (初入文坛)

[求助] 为什么不能把TIO2作为光阴极

小妹是电化学新手,在看TIO2光催化时发现都是用TIO2作阳极,利用空穴,但为什么不能把TIO2用作阴极,用它的光电子去还原呢? 谢谢各位啦
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walterking

铁虫 (初入文坛)

不知道,但支持一下
毅力!!加油!!!
2楼2011-12-02 17:48:50
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gusantong117

铜虫 (初入文坛)

【答案】应助回帖

chinlly(金币+3): 谢谢,如果我想选一个阴极电极,应该考虑它的还原电位,还是它是p型半导体? 2011-12-05 09:19:32
The reason I think is due to the relatively high reduction potential of hole and low oxidation potential of electron. So the photoactived holes is more active than the photoactived electrons. When the TiO2 is used as anode, the low active electrons are thus transfered to the cathode. At the cathode, they are easilier to react with reactant. If you use the TiO2 as cathode, then the active holes are neutralized, and the remain electron is still less active, so you can not get good results.
3楼2011-12-02 20:15:23
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