Anodic activation of PtRu/C catalysts for methanol oxidation.
Anodic activation of PtRu/C catalysts for methanol oxidation.
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DOI：
10.1021/jp0461652
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
Qingye Lu;Bo Yang;Zhuang Lin;Juntao Lu
中科院分区：
文献类型：
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作者：
Qingye Lu;Bo Yang;Zhuang Lin;Juntao Lu
PtRu/C催化剂在0.5 M硫酸中以1.3 V （vs RHE）阳极处理0.5 h后，甲醇氧化活性提高了几十倍至5倍。这种阳极活化效应对国内不同条件下制备的样品和Johnson-Matthey公司生产的样品都有效。根据循环伏安法在阳极处理过程中的变化，提出了活化效应的模型。根据模型，催化剂中的钌氧化物有两大类：一类是电化学可逆的，对催化活性有利；另一类是不可逆的，对催化活性有害。在阳极处理过程中，有害氧化物减少，而有益氧化物增加或仅略有变化，从而产生有益的净变化。
Anodic treatment of PtRu/C catalysts in 0.5 M sulfuric acid at 1.3 V (vs RHE) for 0.5 h was found able to promote the activity for methanol oxidation by a few tenths to 5 times. This anodic activation effect was valid for samples domestically prepared under different conditions and that produced by Johnson-Matthey. On the basis of the changes of cyclic voltammetry during the anodic treatment, a model was proposed for the activation effect. According to the model, there are two categories of ruthenium oxides in the catalyst: one is electrochemically reversible and beneficial for catalytic activity, while the other is irreversible and harmful. During the anodic treatment, the harmful oxide is decreased, while the beneficial oxide either increased or changed only slightly, resulting in a beneficial net change.