Preparation of Well-Alloyed PtRu/C Catalyst by Sequential Mixing of the Precursors in a Polyol Method
Preparation of Well-Alloyed PtRu/C Catalyst by Sequential Mixing of the Precursors in a Polyol Method
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DOI：
10.1149/1.3223666
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发表时间：
2009-11
影响因子：
3.9
通讯作者：
Guoxiong Wang;T. Takeguchi;E. N. Muhamad;T. Yamanaka;M. Sadakane;W. Ueda
中科院分区：
文献类型：
--
作者：
Guoxiong Wang;T. Takeguchi;E. N. Muhamad;T. Yamanaka;M. Sadakane;W. Ueda
通过在多元醇方法中顺序混合前体来制备良好合金化且高度耐CO的45wt%PtRu/C催化剂。PtRu/C催化剂的合金化程度远高于多元醇法同时混合前驱体制备的PtRu/C催化剂。在顺序混合法中，Pt和Ru化合物同时被还原，这是因为在加入H2PtCl6之前，Ru3+被部分还原为Ru2+，促进了PtRu合金的形成，随后的乙二醇高温还原处理进一步提高了合金化程度。通过CO溶出伏安法测定，PtRu/C催化剂的CO吸附氧化峰电位负移，证实了合金化良好的PtRu/C催化剂具有更好的CO耐受性。当阳极通入CO污染的H2时，良好合金化的PtRu/C催化剂表现出比常规和商业PtRu/C催化剂更好的单电池性能。
A well-alloyed and highly CO-tolerant 45 wt % PtRu/C catalyst was prepared by sequential mixing of the precursors in a polyol method. The alloying degree of the PtRu/C catalyst was much higher than that of the conventional PtRu/C catalyst prepared by simultaneous mixing of the precursors in the polyol method. In the sequential mixing approach, Pt and Ru compounds were reduced at the same time because Ru 3+ was partly reduced to Ru 2+ before the addition of H 2 PtCl 6 , which promoted PtRu alloy formation, and subsequent reduction treatment by ethylene glycol at a high temperature further improved the alloying degree. Greater CO tolerance of the well-alloyed PtRu/C catalyst was verified by a negative shift in peak potential of CO ads electro-oxidation in CO stripping voltammetry. The well-alloyed PtRu/C catalyst showed a better single-cell performance than the conventional and commercial PtRu/C catalysts when the anode was fed with CO-contaminated H 2 .