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催化学报  2013 

La-O小团簇上超氧物种与过氧物种间的连接途径

DOI: 10.1016/S1872-2067(12)60694-9, PP. 2130-2137

Keywords: ,超氧,过氧,氧化镧,密度泛函理论

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Abstract:

?采用密度泛函理论方法考察了La-O团簇上超氧物种与过氧物种间转化的连接途径.单重态下,团簇上单个超氧物种可通过一系列臭氧物种转化为过氧物种,且转化能垒较高;三重态下,单个超氧物种则并无与过氧物种间连接的途径.然而,La-O团簇上两超氧物种间的相互作用及其转化也具单重态和三重态两条途径.三重态下,超氧物种可很容易地转化为过氧物种(O2-+O2-?O22-+O2),超氧物种与过氧物种处于快速的交换状态之中;单重态下,超氧物种转化为过氧物种则需较高的活化能垒,表明在单重态下这些氧物种具有较高的稳定性.

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