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制备了一种新的甲醇直接燃料电池Pt/RuO2/CNTs阳极催化剂,在相同Pt负载量下,其甲醇电催化氧化活性是Pt/CNTs的3倍.采用循环伏安法研究发现Pt/RuO2/CNTs纳米催化剂中RuO2含量对甲醇电催化氧化活性有明显影响,当Pt和RuO2在碳纳米管上含量分别为15%和9.5%时,Pt/RuO2/CNTs催化剂具有最佳的甲醇电催化氧化活性.RuO2负载在碳纳米管上比电容的变化,反映了水合RuO2结构中质子与电子传输平衡的能力,分析表明,催化剂中RuO2含量不同导致电容的变化是影响甲醇电催化氧化活性的主要原因.当催化剂结构中质子与电子传输达到平衡时,催化剂比电容最大,电催化氧化活性最高.这种基于电容关联电催化剂的观点对甲醇直接燃料电池阳极催化剂的设计非常有意义.
A new methanol direct fuel cell Pt / RuO2 / CNTs anode catalyst was prepared, and the electrocatalytic activity of methanol electrocatalytic oxidation was 3 times that of Pt / CNTs under the same Pt loading.Using cyclic voltammetry, Pt / RuO2 / The content of RuO2 in CNTs nanocomposite has a significant effect on the electrocatalytic oxidation of methanol. The Pt / RuO2 / CNTs catalyst has the best electrocatalytic activity for methanol oxidation when the contents of Pt and RuO2 on carbon nanotubes are 15% and 9.5%, respectively The change of specific capacitance of RuO2 on carbon nanotubes reflects the balance of proton and electron transport in the hydrated RuO2 structure. The analysis shows that the change of capacitance due to the different RuO2 content in the catalyst is the main reason that affects the electrocatalytic oxidation activity of methanol. When the proton and electron transport in the catalyst structure reaches a balance, the maximum specific capacitance of the catalyst and the highest electrocatalytic oxidation activity are obtained. This view based on the capacitance-related electrocatalyst is of great significance to the design of the anode catalyst for a methanol direct fuel cell.